<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:df16f3db-4813-412f-bc8e-ca4e55d5ea28,g:f524b7bc-5ec7-4e11-8f90-fb2876d85f05-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.affirm.com/role/CoverPage" xlink:type="simple" xlink:href="afrm-20250630.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_6c45ad50-986c-4173-86b7-8d4236cf65bd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_DocumentInformationTable_6c45ad50-986c-4173-86b7-8d4236cf65bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_f6cfc73e-fff1-4949-97b5-0fb88af5b847" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_6c45ad50-986c-4173-86b7-8d4236cf65bd" xlink:to="loc_us-gaap_StatementClassOfStockAxis_f6cfc73e-fff1-4949-97b5-0fb88af5b847" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_f6cfc73e-fff1-4949-97b5-0fb88af5b847_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_f6cfc73e-fff1-4949-97b5-0fb88af5b847" xlink:to="loc_us-gaap_ClassOfStockDomain_f6cfc73e-fff1-4949-97b5-0fb88af5b847_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_48d1da1a-e632-407f-80b4-0e5f0dd43617" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_f6cfc73e-fff1-4949-97b5-0fb88af5b847" xlink:to="loc_us-gaap_ClassOfStockDomain_48d1da1a-e632-407f-80b4-0e5f0dd43617" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_091a01f7-d569-401e-ad61-8857d07b9332" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_48d1da1a-e632-407f-80b4-0e5f0dd43617" xlink:to="loc_us-gaap_CommonClassAMember_091a01f7-d569-401e-ad61-8857d07b9332" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_0477a3f2-fe98-418f-8414-5c4edb1e58a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_48d1da1a-e632-407f-80b4-0e5f0dd43617" xlink:to="loc_us-gaap_CommonClassBMember_0477a3f2-fe98-418f-8414-5c4edb1e58a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_3e097752-0074-4114-8616-02165229744c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_DocumentType_3e097752-0074-4114-8616-02165229744c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentAnnualReport_bf86860e-4127-4f83-aeb0-83910fd47b02" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentAnnualReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_DocumentAnnualReport_bf86860e-4127-4f83-aeb0-83910fd47b02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_cec4a0fb-5a1e-453a-aea6-e446ccb3669b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_DocumentPeriodEndDate_cec4a0fb-5a1e-453a-aea6-e446ccb3669b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_9a67bac5-24e2-4db0-b77c-45aa13c5e306" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_CurrentFiscalYearEndDate_9a67bac5-24e2-4db0-b77c-45aa13c5e306" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_fbe2a25e-c320-4e19-bcb2-098927883dd7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_DocumentTransitionReport_fbe2a25e-c320-4e19-bcb2-098927883dd7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_e78c8165-ff2c-4088-8c67-13d1a0115be6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityFileNumber_e78c8165-ff2c-4088-8c67-13d1a0115be6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_648cafe5-9191-4a67-9689-e7997fd71a07" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityRegistrantName_648cafe5-9191-4a67-9689-e7997fd71a07" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_f9133dec-3a09-4fad-97ea-f4566b37f274" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityIncorporationStateCountryCode_f9133dec-3a09-4fad-97ea-f4566b37f274" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_b3c0e05b-4c66-4b48-a223-a1852f1d5a89" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityTaxIdentificationNumber_b3c0e05b-4c66-4b48-a223-a1852f1d5a89" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_0e8b1397-8111-4e9c-a6d4-4b8cea9c0469" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityAddressAddressLine1_0e8b1397-8111-4e9c-a6d4-4b8cea9c0469" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_4204c9f7-021e-4cff-ae2d-7d34c7ae46ba" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityAddressCityOrTown_4204c9f7-021e-4cff-ae2d-7d34c7ae46ba" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_20813f0a-6604-4e48-bc64-793e36bde552" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityAddressStateOrProvince_20813f0a-6604-4e48-bc64-793e36bde552" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_3581fbda-1976-4ee4-8941-0afe0debc71d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityAddressPostalZipCode_3581fbda-1976-4ee4-8941-0afe0debc71d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_88e51b8a-a740-4b5f-bdc4-39d87cee18b6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_CityAreaCode_88e51b8a-a740-4b5f-bdc4-39d87cee18b6" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_3025eac5-461c-4ad8-852f-6e0735e7a424" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_LocalPhoneNumber_3025eac5-461c-4ad8-852f-6e0735e7a424" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_0accfebc-07cf-4309-9299-8c25ea208470" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_Security12bTitle_0accfebc-07cf-4309-9299-8c25ea208470" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_70bad9e1-f4b7-4469-ad94-548d92682353" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_TradingSymbol_70bad9e1-f4b7-4469-ad94-548d92682353" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_7f9f49b5-7926-47a6-b926-4cea404f88bf" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_SecurityExchangeName_7f9f49b5-7926-47a6-b926-4cea404f88bf" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_f3cfc4b1-083b-435b-9e7a-b5c63407cf03" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityWellKnownSeasonedIssuer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityWellKnownSeasonedIssuer_f3cfc4b1-083b-435b-9e7a-b5c63407cf03" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityVoluntaryFilers_2951c9c7-f699-48fd-8b5d-92956a447f81" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityVoluntaryFilers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityVoluntaryFilers_2951c9c7-f699-48fd-8b5d-92956a447f81" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_37d0eabd-7729-4ee2-b385-89ee96a8a271" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityCurrentReportingStatus_37d0eabd-7729-4ee2-b385-89ee96a8a271" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_60ac56ba-6aec-4cda-8377-27b532313240" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityInteractiveDataCurrent_60ac56ba-6aec-4cda-8377-27b532313240" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_9a389a2a-49a0-4205-992b-2d6440050165" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityFilerCategory_9a389a2a-49a0-4205-992b-2d6440050165" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_7d1d717a-4779-4ecb-b3c2-71555e8fcefb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntitySmallBusiness_7d1d717a-4779-4ecb-b3c2-71555e8fcefb" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_ebf5221a-e9d4-4c87-b372-7e78aecc057c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityEmergingGrowthCompany_ebf5221a-e9d4-4c87-b372-7e78aecc057c" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_IcfrAuditorAttestationFlag_625529ae-821b-4390-81d9-77d9a79f59d1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_IcfrAuditorAttestationFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_IcfrAuditorAttestationFlag_625529ae-821b-4390-81d9-77d9a79f59d1" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFinStmtErrorCorrectionFlag_e55276ad-6089-4f2a-b636-b8d352b39d1f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFinStmtErrorCorrectionFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_DocumentFinStmtErrorCorrectionFlag_e55276ad-6089-4f2a-b636-b8d352b39d1f" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_b598b73c-9abb-488a-9dff-2b99bab7161d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityShellCompany_b598b73c-9abb-488a-9dff-2b99bab7161d" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityPublicFloat_cfbb50b8-d95e-4798-99d7-d3a9f952fbc6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityPublicFloat"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityPublicFloat_cfbb50b8-d95e-4798-99d7-d3a9f952fbc6" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_9e58afc1-f6cf-4c1c-818f-42e6d9924056" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_9e58afc1-f6cf-4c1c-818f-42e6d9924056" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentsIncorporatedByReferenceTextBlock_ba13ac58-f765-4155-8e62-8329f0a6b982" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentsIncorporatedByReferenceTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_DocumentsIncorporatedByReferenceTextBlock_ba13ac58-f765-4155-8e62-8329f0a6b982" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_e80cef0f-0dea-4cf7-94c3-15b51af1ea52" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_AmendmentFlag_e80cef0f-0dea-4cf7-94c3-15b51af1ea52" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_441ca493-0145-44ec-a0ba-25cd214f9ff1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_DocumentFiscalPeriodFocus_441ca493-0145-44ec-a0ba-25cd214f9ff1" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_bb361904-0b65-407f-bcf0-a3b04282b412" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_DocumentFiscalYearFocus_bb361904-0b65-407f-bcf0-a3b04282b412" xlink:type="arc" order="33"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_af376b93-f04f-4d9e-a005-898e626a892f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_a416c765-3916-49bd-9322-e07fb8cad49f" xlink:to="loc_dei_EntityCentralIndexKey_af376b93-f04f-4d9e-a005-898e626a892f" xlink:type="arc" order="34"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="afrm-20250630.xsd#CONSOLIDATEDBALANCESHEETS"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_04f7dfb0-4d2a-4110-89b8-b6aec5b298d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_8bb3f0b4-ef1e-44ee-a76a-882f8ac2bc21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_04f7dfb0-4d2a-4110-89b8-b6aec5b298d2" xlink:to="loc_us-gaap_StatementTable_8bb3f0b4-ef1e-44ee-a76a-882f8ac2bc21" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_4f768252-9f53-4f01-9637-d371eef75b35" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_8bb3f0b4-ef1e-44ee-a76a-882f8ac2bc21" xlink:to="loc_us-gaap_StatementClassOfStockAxis_4f768252-9f53-4f01-9637-d371eef75b35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_4f768252-9f53-4f01-9637-d371eef75b35_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_4f768252-9f53-4f01-9637-d371eef75b35" xlink:to="loc_us-gaap_ClassOfStockDomain_4f768252-9f53-4f01-9637-d371eef75b35_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_3441d0f1-589e-4ff1-8fe7-412d4912329e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_4f768252-9f53-4f01-9637-d371eef75b35" xlink:to="loc_us-gaap_ClassOfStockDomain_3441d0f1-589e-4ff1-8fe7-412d4912329e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_8afd5ca0-4916-4ca3-8948-4e77a43641e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_3441d0f1-589e-4ff1-8fe7-412d4912329e" xlink:to="loc_us-gaap_CommonClassAMember_8afd5ca0-4916-4ca3-8948-4e77a43641e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_f0d5e103-84ef-48b0-aaf7-26682a90b2ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_3441d0f1-589e-4ff1-8fe7-412d4912329e" xlink:to="loc_us-gaap_CommonClassBMember_f0d5e103-84ef-48b0-aaf7-26682a90b2ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_b5856ae1-671f-48bc-b2ca-51a2b0fb1842" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_8bb3f0b4-ef1e-44ee-a76a-882f8ac2bc21" xlink:to="loc_srt_ConsolidatedEntitiesAxis_b5856ae1-671f-48bc-b2ca-51a2b0fb1842" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_b5856ae1-671f-48bc-b2ca-51a2b0fb1842_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_b5856ae1-671f-48bc-b2ca-51a2b0fb1842" xlink:to="loc_srt_ConsolidatedEntitiesDomain_b5856ae1-671f-48bc-b2ca-51a2b0fb1842_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_72bac7bd-ef0d-4016-9857-cf5f6b0b0302" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_b5856ae1-671f-48bc-b2ca-51a2b0fb1842" xlink:to="loc_srt_ConsolidatedEntitiesDomain_72bac7bd-ef0d-4016-9857-cf5f6b0b0302" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_1684d4ad-c408-45fa-8d35-7bf92f31ba08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_72bac7bd-ef0d-4016-9857-cf5f6b0b0302" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_1684d4ad-c408-45fa-8d35-7bf92f31ba08" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_7499acd6-3c6c-40f2-b8e5-77409bde2541" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_8bb3f0b4-ef1e-44ee-a76a-882f8ac2bc21" xlink:to="loc_us-gaap_DebtInstrumentAxis_7499acd6-3c6c-40f2-b8e5-77409bde2541" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_7499acd6-3c6c-40f2-b8e5-77409bde2541_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_7499acd6-3c6c-40f2-b8e5-77409bde2541" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_7499acd6-3c6c-40f2-b8e5-77409bde2541_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_25a5b6f6-fcdd-464a-85dd-c09f2308364f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_7499acd6-3c6c-40f2-b8e5-77409bde2541" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_25a5b6f6-fcdd-464a-85dd-c09f2308364f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_NotesIssuedBySecuritizationTrustsMember_916d0f45-a004-411a-80b2-618f51a53e19" xlink:href="afrm-20250630.xsd#afrm_NotesIssuedBySecuritizationTrustsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_25a5b6f6-fcdd-464a-85dd-c09f2308364f" xlink:to="loc_afrm_NotesIssuedBySecuritizationTrustsMember_916d0f45-a004-411a-80b2-618f51a53e19" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_d9ee9bfa-fd34-4739-bc37-32fde30629da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_04f7dfb0-4d2a-4110-89b8-b6aec5b298d2" xlink:to="loc_us-gaap_AssetsAbstract_d9ee9bfa-fd34-4739-bc37-32fde30629da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_174379d3-6508-410f-8051-587a5ca11074" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d9ee9bfa-fd34-4739-bc37-32fde30629da" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_174379d3-6508-410f-8051-587a5ca11074" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_e39093ff-aaeb-4d06-ada5-df21f1b8cf1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d9ee9bfa-fd34-4739-bc37-32fde30629da" xlink:to="loc_us-gaap_RestrictedCash_e39093ff-aaeb-4d06-ada5-df21f1b8cf1d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestments_cbe6f6ee-9db9-4f07-8a3d-3abb091527d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d9ee9bfa-fd34-4739-bc37-32fde30629da" xlink:to="loc_us-gaap_OtherInvestments_cbe6f6ee-9db9-4f07-8a3d-3abb091527d3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableHeldForSaleAmount_69007c8e-0164-433c-8622-19a854f46695" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansReceivableHeldForSaleAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d9ee9bfa-fd34-4739-bc37-32fde30629da" xlink:to="loc_us-gaap_LoansReceivableHeldForSaleAmount_69007c8e-0164-433c-8622-19a854f46695" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_69d5bb55-a9fa-4f26-aa10-4f662d3d441f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesReceivableGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d9ee9bfa-fd34-4739-bc37-32fde30629da" xlink:to="loc_us-gaap_NotesReceivableGross_69d5bb55-a9fa-4f26-aa10-4f662d3d441f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_0eb7cfbc-39f5-4a26-ba08-9b76a03d9656" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d9ee9bfa-fd34-4739-bc37-32fde30629da" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_0eb7cfbc-39f5-4a26-ba08-9b76a03d9656" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableNet_c85cc084-4ae8-49b4-9491-66ee42452176" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d9ee9bfa-fd34-4739-bc37-32fde30629da" xlink:to="loc_us-gaap_NotesReceivableNet_c85cc084-4ae8-49b4-9491-66ee42452176" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNet_b1b402f5-b57f-4987-aa4c-6c3dda8a6b7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d9ee9bfa-fd34-4739-bc37-32fde30629da" xlink:to="loc_us-gaap_AccountsReceivableNet_b1b402f5-b57f-4987-aa4c-6c3dda8a6b7f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_b507111b-0f88-40db-a024-0a10094fb3cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d9ee9bfa-fd34-4739-bc37-32fde30629da" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_b507111b-0f88-40db-a024-0a10094fb3cd" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_d631e1e1-c089-42fb-9e5b-12704de850ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d9ee9bfa-fd34-4739-bc37-32fde30629da" xlink:to="loc_us-gaap_Goodwill_d631e1e1-c089-42fb-9e5b-12704de850ef" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_382bb6e2-8a5e-4ad6-a211-bb4211356af1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d9ee9bfa-fd34-4739-bc37-32fde30629da" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_382bb6e2-8a5e-4ad6-a211-bb4211356af1" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementAssetNet_b62ce464-c3dc-423f-9e1d-844a52713bf5" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementAssetNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d9ee9bfa-fd34-4739-bc37-32fde30629da" xlink:to="loc_afrm_CommercialAgreementAssetNet_b62ce464-c3dc-423f-9e1d-844a52713bf5" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_edc150a4-cb08-467b-b03b-a308e476c8e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d9ee9bfa-fd34-4739-bc37-32fde30629da" xlink:to="loc_us-gaap_OtherAssets_edc150a4-cb08-467b-b03b-a308e476c8e2" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_1f395db9-942b-40ef-a015-38f10837dddb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d9ee9bfa-fd34-4739-bc37-32fde30629da" xlink:to="loc_us-gaap_Assets_1f395db9-942b-40ef-a015-38f10837dddb" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_8ebb371a-5f21-4d16-ae2b-7cc61cb6e339" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_04f7dfb0-4d2a-4110-89b8-b6aec5b298d2" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_8ebb371a-5f21-4d16-ae2b-7cc61cb6e339" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_edd7aa84-f3d0-4aad-baaa-0f0e74483ab0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_8ebb371a-5f21-4d16-ae2b-7cc61cb6e339" xlink:to="loc_us-gaap_LiabilitiesAbstract_edd7aa84-f3d0-4aad-baaa-0f0e74483ab0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_f9702b1b-fa07-4d4f-8200-c72bbaa59d61" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_edd7aa84-f3d0-4aad-baaa-0f0e74483ab0" xlink:to="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_f9702b1b-fa07-4d4f-8200-c72bbaa59d61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ThirdPartyLoanOwnerPayable_1959b2c1-8500-4857-a435-534e41511836" xlink:href="afrm-20250630.xsd#afrm_ThirdPartyLoanOwnerPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_edd7aa84-f3d0-4aad-baaa-0f0e74483ab0" xlink:to="loc_afrm_ThirdPartyLoanOwnerPayable_1959b2c1-8500-4857-a435-534e41511836" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPayableCurrentAndNoncurrent_a86c2e2c-2518-4542-9d36-d913be521316" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_edd7aa84-f3d0-4aad-baaa-0f0e74483ab0" xlink:to="loc_us-gaap_InterestPayableCurrentAndNoncurrent_a86c2e2c-2518-4542-9d36-d913be521316" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilities_109ebce4-e67d-4a73-8b87-338441cf15ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedLiabilitiesAndOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_edd7aa84-f3d0-4aad-baaa-0f0e74483ab0" xlink:to="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilities_109ebce4-e67d-4a73-8b87-338441cf15ed" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebt_eedb3301-006c-4586-99cb-1aea7e012640" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_edd7aa84-f3d0-4aad-baaa-0f0e74483ab0" xlink:to="loc_us-gaap_ConvertibleDebt_eedb3301-006c-4586-99cb-1aea7e012640" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebt_53a084b4-3303-4fec-ac75-2f6d8c85fa76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_edd7aa84-f3d0-4aad-baaa-0f0e74483ab0" xlink:to="loc_us-gaap_SecuredDebt_53a084b4-3303-4fec-ac75-2f6d8c85fa76" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_20bb80b0-3b36-4b6b-b2c0-54c8cf8fe1dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_edd7aa84-f3d0-4aad-baaa-0f0e74483ab0" xlink:to="loc_us-gaap_LineOfCredit_20bb80b0-3b36-4b6b-b2c0-54c8cf8fe1dc" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_543ef32f-b459-466f-8413-ca56a0228122" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_edd7aa84-f3d0-4aad-baaa-0f0e74483ab0" xlink:to="loc_us-gaap_Liabilities_543ef32f-b459-466f-8413-ca56a0228122" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_d4677337-73b8-47cf-a8f0-9ee6cf979315" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_8ebb371a-5f21-4d16-ae2b-7cc61cb6e339" xlink:to="loc_us-gaap_CommitmentsAndContingencies_d4677337-73b8-47cf-a8f0-9ee6cf979315" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_372e5882-3bdb-427d-8aad-9f9cd1115937" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_8ebb371a-5f21-4d16-ae2b-7cc61cb6e339" xlink:to="loc_us-gaap_StockholdersEquityAbstract_372e5882-3bdb-427d-8aad-9f9cd1115937" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_bd164485-06c0-4711-9de8-ed3d557849e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_372e5882-3bdb-427d-8aad-9f9cd1115937" xlink:to="loc_us-gaap_CommonStockValue_bd164485-06c0-4711-9de8-ed3d557849e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_7e7bc759-f922-45b0-9dfa-665546c561d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_372e5882-3bdb-427d-8aad-9f9cd1115937" xlink:to="loc_us-gaap_AdditionalPaidInCapital_7e7bc759-f922-45b0-9dfa-665546c561d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_100b654a-1e3b-4c9c-adda-92c3732137b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_372e5882-3bdb-427d-8aad-9f9cd1115937" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_100b654a-1e3b-4c9c-adda-92c3732137b2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_d5c216b9-1038-441f-b09d-6c971b3a1e53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_372e5882-3bdb-427d-8aad-9f9cd1115937" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_d5c216b9-1038-441f-b09d-6c971b3a1e53" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_d56b5d1b-c9ce-4a5b-a086-98ee552aa931" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_372e5882-3bdb-427d-8aad-9f9cd1115937" xlink:to="loc_us-gaap_StockholdersEquity_d56b5d1b-c9ce-4a5b-a086-98ee552aa931" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_edc241a3-6ad7-46d8-b832-91a33deb0092" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_8ebb371a-5f21-4d16-ae2b-7cc61cb6e339" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_edc241a3-6ad7-46d8-b832-91a33deb0092" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_7c3f3581-1934-4b26-b519-5d3815e2f64e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_1234c355-a88d-492f-b459-4f1f6475d935" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesReceivableGross"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_f3d4ebaa-3d3e-41fc-8627-a490b9f35462" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableNet_28a97f17-3808-44f5-8401-7e7849f34429" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesReceivableNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNet_ad569b34-dbcb-43cd-aec7-e302b98b127a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_26198090-af07-40f4-8cf2-374edf57ba91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_f835777d-fc7e-47f9-9b16-e80a5c7f4fca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_f1b326f6-5999-401d-b97e-d199eda59221" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_20f9c076-3f4e-4c16-baac-71a720d87572" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableCurrentAndNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPayableCurrentAndNoncurrent_004d1205-a221-437d-8329-00417b72e98d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestPayableCurrentAndNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilities_2fea01a6-fe0c-4fe4-bd25-a0b62fcc0533" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedLiabilitiesAndOtherLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebt_3824065f-7cfa-4a38-9c44-db908526cf64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebt"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_6c2c4594-7807-44bc-97d9-412628d59659" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_e45795d4-b779-4d0c-ac18-454ec17a5b0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNet_4bdaafb8-834b-421b-82dd-5f356d22d1dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_8ebb371a-5f21-4d16-ae2b-7cc61cb6e339" xlink:to="loc_us-gaap_AssetsNet_4bdaafb8-834b-421b-82dd-5f356d22d1dc" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/CONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="simple" xlink:href="afrm-20250630.xsd#CONSOLIDATEDBALANCESHEETSParenthetical"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/CONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_2febaa2e-0174-4c87-a5d2-41c96169173c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_91f17b73-30be-4343-a0ec-9bdca5205f36" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_2febaa2e-0174-4c87-a5d2-41c96169173c" xlink:to="loc_us-gaap_StatementTable_91f17b73-30be-4343-a0ec-9bdca5205f36" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_554a3d32-529b-4837-897e-18606f1df1f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_91f17b73-30be-4343-a0ec-9bdca5205f36" xlink:to="loc_us-gaap_StatementClassOfStockAxis_554a3d32-529b-4837-897e-18606f1df1f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_554a3d32-529b-4837-897e-18606f1df1f3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_554a3d32-529b-4837-897e-18606f1df1f3" xlink:to="loc_us-gaap_ClassOfStockDomain_554a3d32-529b-4837-897e-18606f1df1f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_d041a8b7-d613-4c33-965d-5e6cf59d8ecd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_554a3d32-529b-4837-897e-18606f1df1f3" xlink:to="loc_us-gaap_ClassOfStockDomain_d041a8b7-d613-4c33-965d-5e6cf59d8ecd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_9355363f-63c2-4f16-a809-96b963d22392" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_d041a8b7-d613-4c33-965d-5e6cf59d8ecd" xlink:to="loc_us-gaap_CommonClassAMember_9355363f-63c2-4f16-a809-96b963d22392" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_bb9cd91f-2f92-4d2d-bd69-a10d312db333" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_d041a8b7-d613-4c33-965d-5e6cf59d8ecd" xlink:to="loc_us-gaap_CommonClassBMember_bb9cd91f-2f92-4d2d-bd69-a10d312db333" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_1adac246-a0b4-4e97-a3dd-af7ca047830a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2febaa2e-0174-4c87-a5d2-41c96169173c" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_1adac246-a0b4-4e97-a3dd-af7ca047830a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_124346d0-e3c9-4ac1-85be-33cb8048f754" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2febaa2e-0174-4c87-a5d2-41c96169173c" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_124346d0-e3c9-4ac1-85be-33cb8048f754" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_f3eaee97-9a11-4355-92d5-9694a82c50d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2febaa2e-0174-4c87-a5d2-41c96169173c" xlink:to="loc_us-gaap_CommonStockSharesIssued_f3eaee97-9a11-4355-92d5-9694a82c50d0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_702398ab-e90a-4364-95b3-80dbedb01bd4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2febaa2e-0174-4c87-a5d2-41c96169173c" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_702398ab-e90a-4364-95b3-80dbedb01bd4" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONSANDCOMPREHENSIVEINCOMELOSS" xlink:type="simple" xlink:href="afrm-20250630.xsd#CONSOLIDATEDSTATEMENTSOFOPERATIONSANDCOMPREHENSIVEINCOMELOSS"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONSANDCOMPREHENSIVEINCOMELOSS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_e11d1b6d-8642-453a-8036-f472c2d2989b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_37855fdd-5ada-4d81-92c7-79477f38ca9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_e11d1b6d-8642-453a-8036-f472c2d2989b" xlink:to="loc_us-gaap_StatementTable_37855fdd-5ada-4d81-92c7-79477f38ca9f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_9563d46b-1fdd-4c24-859f-277ab833a447" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_37855fdd-5ada-4d81-92c7-79477f38ca9f" xlink:to="loc_srt_ProductOrServiceAxis_9563d46b-1fdd-4c24-859f-277ab833a447" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_9563d46b-1fdd-4c24-859f-277ab833a447_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_9563d46b-1fdd-4c24-859f-277ab833a447" xlink:to="loc_srt_ProductsAndServicesDomain_9563d46b-1fdd-4c24-859f-277ab833a447_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_dbb38fac-9ccf-4051-8b7c-4101f9c345a4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_9563d46b-1fdd-4c24-859f-277ab833a447" xlink:to="loc_srt_ProductsAndServicesDomain_dbb38fac-9ccf-4051-8b7c-4101f9c345a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_MerchantNetworkMember_38ec79ca-e533-4942-968d-00da2b960f1b" xlink:href="afrm-20250630.xsd#afrm_MerchantNetworkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_dbb38fac-9ccf-4051-8b7c-4101f9c345a4" xlink:to="loc_afrm_MerchantNetworkMember_38ec79ca-e533-4942-968d-00da2b960f1b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_VirtualCardNetworkMember_a351f17f-3d67-4ced-8699-3a3f5d3c48c8" xlink:href="afrm-20250630.xsd#afrm_VirtualCardNetworkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_dbb38fac-9ccf-4051-8b7c-4101f9c345a4" xlink:to="loc_afrm_VirtualCardNetworkMember_a351f17f-3d67-4ced-8699-3a3f5d3c48c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_00109a18-12bc-4683-a2a7-75da84b06e27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e11d1b6d-8642-453a-8036-f472c2d2989b" xlink:to="loc_us-gaap_RevenuesAbstract_00109a18-12bc-4683-a2a7-75da84b06e27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_8c30cf99-20bc-4244-a18d-a022e4036e19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_00109a18-12bc-4683-a2a7-75da84b06e27" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_8c30cf99-20bc-4244-a18d-a022e4036e19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_9ac8b803-92ec-48b4-bda5-369a66720870" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestAndDividendIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_00109a18-12bc-4683-a2a7-75da84b06e27" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating_9ac8b803-92ec-48b4-bda5-369a66720870" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSalesOfLoansNet_b47a3622-0b40-4eaa-b058-097be56beb80" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSalesOfLoansNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_00109a18-12bc-4683-a2a7-75da84b06e27" xlink:to="loc_us-gaap_GainLossOnSalesOfLoansNet_b47a3622-0b40-4eaa-b058-097be56beb80" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets_a54d3d74-916a-4218-b5e7-9a50e7325c05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_00109a18-12bc-4683-a2a7-75da84b06e27" xlink:to="loc_us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets_a54d3d74-916a-4218-b5e7-9a50e7325c05" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_56b48770-2293-40d2-9fc5-884fe37d3a56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_00109a18-12bc-4683-a2a7-75da84b06e27" xlink:to="loc_us-gaap_Revenues_56b48770-2293-40d2-9fc5-884fe37d3a56" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_55dd6ddf-0189-45fe-98d9-59e3b89b015a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e11d1b6d-8642-453a-8036-f472c2d2989b" xlink:to="loc_us-gaap_OperatingExpensesAbstract_55dd6ddf-0189-45fe-98d9-59e3b89b015a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_LossOnFinancingReceivableCommitmentsToPurchase_99efbe56-efa9-4327-8f5c-c3d2a6445b8b" xlink:href="afrm-20250630.xsd#afrm_LossOnFinancingReceivableCommitmentsToPurchase"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_55dd6ddf-0189-45fe-98d9-59e3b89b015a" xlink:to="loc_afrm_LossOnFinancingReceivableCommitmentsToPurchase_99efbe56-efa9-4327-8f5c-c3d2a6445b8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanLossesExpensed_3f78e83f-c302-48fa-97c1-d59b3e662b23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProvisionForLoanLossesExpensed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_55dd6ddf-0189-45fe-98d9-59e3b89b015a" xlink:to="loc_us-gaap_ProvisionForLoanLossesExpensed_3f78e83f-c302-48fa-97c1-d59b3e662b23" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_c8a4302c-b088-4526-9322-de3d46c9fe73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_55dd6ddf-0189-45fe-98d9-59e3b89b015a" xlink:to="loc_us-gaap_InterestExpenseDebt_c8a4302c-b088-4526-9322-de3d46c9fe73" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ProcessingAndServicingExpense_20c561a5-a51b-4bd1-9c9a-0e21e02e7863" xlink:href="afrm-20250630.xsd#afrm_ProcessingAndServicingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_55dd6ddf-0189-45fe-98d9-59e3b89b015a" xlink:to="loc_afrm_ProcessingAndServicingExpense_20c561a5-a51b-4bd1-9c9a-0e21e02e7863" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_TechnologyAndDataAnalyticsExpense_013e3ca0-2797-45ef-83f0-f864126f6e8f" xlink:href="afrm-20250630.xsd#afrm_TechnologyAndDataAnalyticsExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_55dd6ddf-0189-45fe-98d9-59e3b89b015a" xlink:to="loc_afrm_TechnologyAndDataAnalyticsExpense_013e3ca0-2797-45ef-83f0-f864126f6e8f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpense_c538e21d-3326-41c8-8980-42eefb209584" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingAndMarketingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_55dd6ddf-0189-45fe-98d9-59e3b89b015a" xlink:to="loc_us-gaap_SellingAndMarketingExpense_c538e21d-3326-41c8-8980-42eefb209584" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_8ad82487-a7dd-4934-9ee3-f612842429c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_55dd6ddf-0189-45fe-98d9-59e3b89b015a" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_8ad82487-a7dd-4934-9ee3-f612842429c2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RestructuringChargesReversalsAndOtherExpense_85e3b5d4-469f-44de-9b28-f3bc1b19c8d9" xlink:href="afrm-20250630.xsd#afrm_RestructuringChargesReversalsAndOtherExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_55dd6ddf-0189-45fe-98d9-59e3b89b015a" xlink:to="loc_afrm_RestructuringChargesReversalsAndOtherExpense_85e3b5d4-469f-44de-9b28-f3bc1b19c8d9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_a0e8e2c7-d057-4c25-a682-af17e41725e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_55dd6ddf-0189-45fe-98d9-59e3b89b015a" xlink:to="loc_us-gaap_CostsAndExpenses_a0e8e2c7-d057-4c25-a682-af17e41725e4" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_668dadd2-49bc-43e8-9b41-659fc4e8361f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e11d1b6d-8642-453a-8036-f472c2d2989b" xlink:to="loc_us-gaap_OperatingIncomeLoss_668dadd2-49bc-43e8-9b41-659fc4e8361f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_562e3638-fcea-4c6e-b617-b38dcfb826ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e11d1b6d-8642-453a-8036-f472c2d2989b" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_562e3638-fcea-4c6e-b617-b38dcfb826ee" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_56c7b1c4-11a9-4db6-98ac-e913c1feab2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e11d1b6d-8642-453a-8036-f472c2d2989b" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_56c7b1c4-11a9-4db6-98ac-e913c1feab2c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_fede00a4-f50a-4a72-8fdb-a7f26369c18f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e11d1b6d-8642-453a-8036-f472c2d2989b" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_fede00a4-f50a-4a72-8fdb-a7f26369c18f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_f949c718-b235-44e0-adde-3abf69a6d8ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e11d1b6d-8642-453a-8036-f472c2d2989b" xlink:to="loc_us-gaap_NetIncomeLoss_f949c718-b235-44e0-adde-3abf69a6d8ec" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_0480ce27-ee94-4a7a-ab7f-79a577f89af7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e11d1b6d-8642-453a-8036-f472c2d2989b" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_0480ce27-ee94-4a7a-ab7f-79a577f89af7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_96098989-13c3-4399-a4f2-42813112e098" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_0480ce27-ee94-4a7a-ab7f-79a577f89af7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_96098989-13c3-4399-a4f2-42813112e098" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_7b30b2e9-22b9-42a3-9197-5bbba09ab629" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_0480ce27-ee94-4a7a-ab7f-79a577f89af7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_7b30b2e9-22b9-42a3-9197-5bbba09ab629" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_1ed34e58-82e8-464e-beb4-1b271dc12e51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_0480ce27-ee94-4a7a-ab7f-79a577f89af7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_1ed34e58-82e8-464e-beb4-1b271dc12e51" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_61667671-83b5-46b7-9e08-09e6058a7c12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_0480ce27-ee94-4a7a-ab7f-79a577f89af7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_61667671-83b5-46b7-9e08-09e6058a7c12" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_af3cc822-ceea-4e5a-9ef0-8ce1601a5a48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e11d1b6d-8642-453a-8036-f472c2d2989b" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_af3cc822-ceea-4e5a-9ef0-8ce1601a5a48" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_b382b101-ae48-4f9a-a86d-c1cbbfc32176" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e11d1b6d-8642-453a-8036-f472c2d2989b" xlink:to="loc_us-gaap_EarningsPerShareAbstract_b382b101-ae48-4f9a-a86d-c1cbbfc32176" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_f46d03a5-b73e-44f4-85fe-211954661204" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_b382b101-ae48-4f9a-a86d-c1cbbfc32176" xlink:to="loc_us-gaap_EarningsPerShareBasic_f46d03a5-b73e-44f4-85fe-211954661204" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_9e6254b9-6d18-4b82-8b56-3402e0042bc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_b382b101-ae48-4f9a-a86d-c1cbbfc32176" xlink:to="loc_us-gaap_EarningsPerShareDiluted_9e6254b9-6d18-4b82-8b56-3402e0042bc4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_8cf1f157-f524-4aee-b2bb-a7d37b7391c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e11d1b6d-8642-453a-8036-f472c2d2989b" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_8cf1f157-f524-4aee-b2bb-a7d37b7391c3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_c2d7ce2e-8857-4f8f-afbc-95b0ee60b0d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_8cf1f157-f524-4aee-b2bb-a7d37b7391c3" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_c2d7ce2e-8857-4f8f-afbc-95b0ee60b0d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_7657f89a-67c8-421d-b7e5-aab7298ad191" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_8cf1f157-f524-4aee-b2bb-a7d37b7391c3" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_7657f89a-67c8-421d-b7e5-aab7298ad191" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/CONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITY" xlink:type="simple" xlink:href="afrm-20250630.xsd#CONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/CONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_e3013282-6a3a-469b-a5fb-9bca795e7479" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_35ba6553-b4e5-4e72-acc4-f35baf5f4fee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_e3013282-6a3a-469b-a5fb-9bca795e7479" xlink:to="loc_us-gaap_StatementTable_35ba6553-b4e5-4e72-acc4-f35baf5f4fee" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_3c9033a0-d38e-4308-b978-af1961628f49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_35ba6553-b4e5-4e72-acc4-f35baf5f4fee" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_3c9033a0-d38e-4308-b978-af1961628f49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_3c9033a0-d38e-4308-b978-af1961628f49_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_3c9033a0-d38e-4308-b978-af1961628f49" xlink:to="loc_us-gaap_EquityComponentDomain_3c9033a0-d38e-4308-b978-af1961628f49_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_8cd57c09-232b-4458-a97b-c5b5d043b9e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_3c9033a0-d38e-4308-b978-af1961628f49" xlink:to="loc_us-gaap_EquityComponentDomain_8cd57c09-232b-4458-a97b-c5b5d043b9e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_6877dd6a-ef8e-47c8-ba47-58e9a6afaff1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_8cd57c09-232b-4458-a97b-c5b5d043b9e8" xlink:to="loc_us-gaap_CommonStockMember_6877dd6a-ef8e-47c8-ba47-58e9a6afaff1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_73863287-2ab0-418a-a0c7-9cf7a2e6f3cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_8cd57c09-232b-4458-a97b-c5b5d043b9e8" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_73863287-2ab0-418a-a0c7-9cf7a2e6f3cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_79cbdffd-6feb-4aac-b5b6-c7558a237966" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_8cd57c09-232b-4458-a97b-c5b5d043b9e8" xlink:to="loc_us-gaap_RetainedEarningsMember_79cbdffd-6feb-4aac-b5b6-c7558a237966" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_fe52d335-2857-401e-bc72-1867e241b088" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_8cd57c09-232b-4458-a97b-c5b5d043b9e8" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_fe52d335-2857-401e-bc72-1867e241b088" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e3013282-6a3a-469b-a5fb-9bca795e7479" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_54b17044-8771-4c5e-96ea-5c622087ae66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_54b17044-8771-4c5e-96ea-5c622087ae66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_9f2ff3f8-bd1d-43c9-8617-0bffb2495cfe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_StockholdersEquity_9f2ff3f8-bd1d-43c9-8617-0bffb2495cfe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_c095187e-2cd9-4a10-a9c3-1525e9be2f04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_c095187e-2cd9-4a10-a9c3-1525e9be2f04" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_d9e328cf-f5c0-4d67-9666-599c2f473a62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_d9e328cf-f5c0-4d67-9666-599c2f473a62" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_cde3af05-fd4b-441c-aa53-d1515646ab7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_cde3af05-fd4b-441c-aa53-d1515646ab7f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_002a6c43-74fc-44d3-b496-84a5118d1c94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_002a6c43-74fc-44d3-b496-84a5118d1c94" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_022f7fb1-957f-4bd0-a576-c6dda8a588fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_022f7fb1-957f-4bd0-a576-c6dda8a588fa" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ClassOfWarrantOrRightSharesWarrantsExercised_272f2b08-d8cd-425d-8727-61e205c6d0ed" xlink:href="afrm-20250630.xsd#afrm_ClassOfWarrantOrRightSharesWarrantsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_afrm_ClassOfWarrantOrRightSharesWarrantsExercised_272f2b08-d8cd-425d-8727-61e205c6d0ed" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited_f1b05c36-9b3f-48b0-b4f7-a56afaca6741" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited_f1b05c36-9b3f-48b0-b4f7-a56afaca6741" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_a794db4b-4808-4042-9119-e744771826b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_a794db4b-4808-4042-9119-e744771826b7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued_37cdaf64-031f-4cf5-9cba-425372e5dcc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued_37cdaf64-031f-4cf5-9cba-425372e5dcc1" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_9fc0789d-d4c0-461d-a262-e9672ce634a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_9fc0789d-d4c0-461d-a262-e9672ce634a0" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_6f8b6d30-962d-42ec-9d05-8aad6e3b60c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_6f8b6d30-962d-42ec-9d05-8aad6e3b60c2" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_fdce4dd0-9814-476b-a2a7-60bb6be7d840" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_fdce4dd0-9814-476b-a2a7-60bb6be7d840" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_bc52d03c-ddd6-416f-99e0-0bdd4cfde5a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_bc52d03c-ddd6-416f-99e0-0bdd4cfde5a9" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_fecf933f-f830-4a4e-8ff9-a8f420eaba6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_fecf933f-f830-4a4e-8ff9-a8f420eaba6a" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_5dfc5e1b-0e2e-4e91-84d9-73cd0495cecd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_5dfc5e1b-0e2e-4e91-84d9-73cd0495cecd" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent_5928dc1c-0c7a-4b40-87d9-f14122d56550" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent_5928dc1c-0c7a-4b40-87d9-f14122d56550" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_f7a98ebd-5a74-4c10-9a4c-4f68b08b6841" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_cae09f2a-673f-4979-8f48-13e522b4f7a8" xlink:to="loc_us-gaap_NetIncomeLoss_f7a98ebd-5a74-4c10-9a4c-4f68b08b6841" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_59bfedec-e62e-4344-982c-4964fa34c8dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_7932a2f8-a0f6-4046-a953-35112110864b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/SummaryofSignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#SummaryofSignificantAccountingPoliciesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/SummaryofSignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_40860e86-2378-4912-9930-990014ed23d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_be2bc73d-6427-4c8c-9864-dfba8d279763" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_40860e86-2378-4912-9930-990014ed23d9" xlink:to="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_be2bc73d-6427-4c8c-9864-dfba8d279763" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_41ec92b5-c9c2-4cbd-a1df-39db4828330f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_be2bc73d-6427-4c8c-9864-dfba8d279763" xlink:to="loc_srt_RangeAxis_41ec92b5-c9c2-4cbd-a1df-39db4828330f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_41ec92b5-c9c2-4cbd-a1df-39db4828330f_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_41ec92b5-c9c2-4cbd-a1df-39db4828330f" xlink:to="loc_srt_RangeMember_41ec92b5-c9c2-4cbd-a1df-39db4828330f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ad04c030-dc19-4a9d-b1f3-dd74a1ea6d8b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_41ec92b5-c9c2-4cbd-a1df-39db4828330f" xlink:to="loc_srt_RangeMember_ad04c030-dc19-4a9d-b1f3-dd74a1ea6d8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_f9d14a49-f508-4d14-877c-50a401afeb01" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ad04c030-dc19-4a9d-b1f3-dd74a1ea6d8b" xlink:to="loc_srt_MinimumMember_f9d14a49-f508-4d14-877c-50a401afeb01" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_e3e66109-6b97-486e-9af6-81d751f7fe59" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ad04c030-dc19-4a9d-b1f3-dd74a1ea6d8b" xlink:to="loc_srt_MaximumMember_e3e66109-6b97-486e-9af6-81d751f7fe59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_2b61f0ec-a30e-4073-a181-46d2d3688d0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_be2bc73d-6427-4c8c-9864-dfba8d279763" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_2b61f0ec-a30e-4073-a181-46d2d3688d0c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_2b61f0ec-a30e-4073-a181-46d2d3688d0c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_2b61f0ec-a30e-4073-a181-46d2d3688d0c" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_2b61f0ec-a30e-4073-a181-46d2d3688d0c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_34a84790-0d82-4bcd-9474-175779f7bc54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_2b61f0ec-a30e-4073-a181-46d2d3688d0c" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_34a84790-0d82-4bcd-9474-175779f7bc54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentMember_c1c433a7-c2a2-4cee-94ff-a3f749c8fd10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_34a84790-0d82-4bcd-9474-175779f7bc54" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentMember_c1c433a7-c2a2-4cee-94ff-a3f749c8fd10" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_fa2e72d5-237d-4ead-9e60-2db2fe5652b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_34a84790-0d82-4bcd-9474-175779f7bc54" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_fa2e72d5-237d-4ead-9e60-2db2fe5652b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_b751f776-d7fd-4e89-aeff-112005776530" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_be2bc73d-6427-4c8c-9864-dfba8d279763" xlink:to="loc_us-gaap_AwardTypeAxis_b751f776-d7fd-4e89-aeff-112005776530" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b751f776-d7fd-4e89-aeff-112005776530_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_b751f776-d7fd-4e89-aeff-112005776530" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b751f776-d7fd-4e89-aeff-112005776530_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e231455b-4f98-4211-98a1-a61cab55af0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_b751f776-d7fd-4e89-aeff-112005776530" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e231455b-4f98-4211-98a1-a61cab55af0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_8190990b-86f8-4eeb-86a6-05ea135fa515" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e231455b-4f98-4211-98a1-a61cab55af0e" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_8190990b-86f8-4eeb-86a6-05ea135fa515" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_1c78871c-0706-4c83-be2d-45791525f2d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_be2bc73d-6427-4c8c-9864-dfba8d279763" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_1c78871c-0706-4c83-be2d-45791525f2d1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_1c78871c-0706-4c83-be2d-45791525f2d1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_1c78871c-0706-4c83-be2d-45791525f2d1" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_1c78871c-0706-4c83-be2d-45791525f2d1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_97ab57eb-f63f-4b60-ad6d-97286c43fdf0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_1c78871c-0706-4c83-be2d-45791525f2d1" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_97ab57eb-f63f-4b60-ad6d-97286c43fdf0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SeniorNotesAndResidualTrustCertificatesMember_ca4419a6-126e-4c5e-be48-f2d14b4688d5" xlink:href="afrm-20250630.xsd#afrm_SeniorNotesAndResidualTrustCertificatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_97ab57eb-f63f-4b60-ad6d-97286c43fdf0" xlink:to="loc_afrm_SeniorNotesAndResidualTrustCertificatesMember_ca4419a6-126e-4c5e-be48-f2d14b4688d5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfOtherComprehensiveIncomeExtensibleList_d9a0355d-3da2-4a02-b542-7aac3c59221f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfOtherComprehensiveIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_40860e86-2378-4912-9930-990014ed23d9" xlink:to="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfOtherComprehensiveIncomeExtensibleList_d9a0355d-3da2-4a02-b542-7aac3c59221f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableHeldForSaleSalePeriod_49274fb9-099c-4dfd-8210-4cfa6c1f2fa3" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableHeldForSaleSalePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_40860e86-2378-4912-9930-990014ed23d9" xlink:to="loc_afrm_FinancingReceivableHeldForSaleSalePeriod_49274fb9-099c-4dfd-8210-4cfa6c1f2fa3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingLiabilityAtFairValueChangeInFairValueValuationInputStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_269c0979-6b80-4137-a820-ca0eed13eb38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingLiabilityAtFairValueChangeInFairValueValuationInputStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_40860e86-2378-4912-9930-990014ed23d9" xlink:to="loc_us-gaap_ServicingLiabilityAtFairValueChangeInFairValueValuationInputStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_269c0979-6b80-4137-a820-ca0eed13eb38" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableThresholdPeriodPastDueSuspendedAccruedInterest_19ba736f-5683-4883-a34f-eb8bec21e37c" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableThresholdPeriodPastDueSuspendedAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_40860e86-2378-4912-9930-990014ed23d9" xlink:to="loc_afrm_FinancingReceivableThresholdPeriodPastDueSuspendedAccruedInterest_19ba736f-5683-4883-a34f-eb8bec21e37c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_5e6d5827-0906-4023-b290-9c299f9ecf6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_40860e86-2378-4912-9930-990014ed23d9" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_5e6d5827-0906-4023-b290-9c299f9ecf6a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_e602faf9-dbc3-4120-845d-0f5fb559d748" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_40860e86-2378-4912-9930-990014ed23d9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_e602faf9-dbc3-4120-845d-0f5fb559d748" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_e66d4f04-9b19-437c-8c9e-a24846422ffc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_40860e86-2378-4912-9930-990014ed23d9" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_e66d4f04-9b19-437c-8c9e-a24846422ffc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdvertisingExpense_017df133-40c7-4f11-81da-60553936a57d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdvertisingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_40860e86-2378-4912-9930-990014ed23d9" xlink:to="loc_us-gaap_AdvertisingExpense_017df133-40c7-4f11-81da-60553936a57d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_5c9e8066-c0dd-452a-ab15-e6d98ee4e0c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_40860e86-2378-4912-9930-990014ed23d9" xlink:to="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_5c9e8066-c0dd-452a-ab15-e6d98ee4e0c3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_8e8b1bfc-e1b2-4470-b433-75fd98d46531" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_40860e86-2378-4912-9930-990014ed23d9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_8e8b1bfc-e1b2-4470-b433-75fd98d46531" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/RevenueScheduleofDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#RevenueScheduleofDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/RevenueScheduleofDisaggregationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_48b5d93b-965e-4d55-abc5-914f8643be1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_a3c0f571-f90b-4afa-a895-3a6880c04cc0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_48b5d93b-965e-4d55-abc5-914f8643be1a" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_a3c0f571-f90b-4afa-a895-3a6880c04cc0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_cb04ac49-994d-49f7-bb55-1cc39004cd1a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_a3c0f571-f90b-4afa-a895-3a6880c04cc0" xlink:to="loc_srt_ProductOrServiceAxis_cb04ac49-994d-49f7-bb55-1cc39004cd1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_cb04ac49-994d-49f7-bb55-1cc39004cd1a_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_cb04ac49-994d-49f7-bb55-1cc39004cd1a" xlink:to="loc_srt_ProductsAndServicesDomain_cb04ac49-994d-49f7-bb55-1cc39004cd1a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_fff0ac7f-6f04-483f-aa53-9d93d6ae27ef" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_cb04ac49-994d-49f7-bb55-1cc39004cd1a" xlink:to="loc_srt_ProductsAndServicesDomain_fff0ac7f-6f04-483f-aa53-9d93d6ae27ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_MerchantNetworkMember_43340ac3-05b7-4cf7-b63c-f5608fa60309" xlink:href="afrm-20250630.xsd#afrm_MerchantNetworkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_fff0ac7f-6f04-483f-aa53-9d93d6ae27ef" xlink:to="loc_afrm_MerchantNetworkMember_43340ac3-05b7-4cf7-b63c-f5608fa60309" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_VirtualCardNetworkMember_7fe8188f-54f1-4b26-970b-b904efae80cd" xlink:href="afrm-20250630.xsd#afrm_VirtualCardNetworkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_fff0ac7f-6f04-483f-aa53-9d93d6ae27ef" xlink:to="loc_afrm_VirtualCardNetworkMember_7fe8188f-54f1-4b26-970b-b904efae80cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_2576ed67-fde6-48f9-8621-666d853c62a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_48b5d93b-965e-4d55-abc5-914f8643be1a" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_2576ed67-fde6-48f9-8621-666d853c62a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_5c96d176-328c-4db0-8083-1953fd482bc8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestAndDividendIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_48b5d93b-965e-4d55-abc5-914f8643be1a" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating_5c96d176-328c-4db0-8083-1953fd482bc8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSalesOfLoansNet_362b2a7b-f746-442a-8f54-4967da925963" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSalesOfLoansNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_48b5d93b-965e-4d55-abc5-914f8643be1a" xlink:to="loc_us-gaap_GainLossOnSalesOfLoansNet_362b2a7b-f746-442a-8f54-4967da925963" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets_b34c9f19-05cc-4972-8d01-f94487d14444" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_48b5d93b-965e-4d55-abc5-914f8643be1a" xlink:to="loc_us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets_b34c9f19-05cc-4972-8d01-f94487d14444" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_ac18c6c8-dbf3-49f6-8482-e2f6e218d1fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_48b5d93b-965e-4d55-abc5-914f8643be1a" xlink:to="loc_us-gaap_Revenues_ac18c6c8-dbf3-49f6-8482-e2f6e218d1fb" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/RevenueScheduleofInterestIncomeDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#RevenueScheduleofInterestIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/RevenueScheduleofInterestIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_00c51554-f0d9-40b3-ab4f-691664dee9cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_ea5b1155-a7af-495f-b275-30867c93cf49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_00c51554-f0d9-40b3-ab4f-691664dee9cf" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_ea5b1155-a7af-495f-b275-30867c93cf49" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_bcf67ba7-0179-47f2-bf6d-efe79a1b0d6c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_ea5b1155-a7af-495f-b275-30867c93cf49" xlink:to="loc_srt_RestatementAxis_bcf67ba7-0179-47f2-bf6d-efe79a1b0d6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_bcf67ba7-0179-47f2-bf6d-efe79a1b0d6c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_bcf67ba7-0179-47f2-bf6d-efe79a1b0d6c" xlink:to="loc_srt_RestatementDomain_bcf67ba7-0179-47f2-bf6d-efe79a1b0d6c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_1323c1f1-a6f1-475f-bd00-574a1a7e972c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_bcf67ba7-0179-47f2-bf6d-efe79a1b0d6c" xlink:to="loc_srt_RestatementDomain_1323c1f1-a6f1-475f-bd00-574a1a7e972c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAdjustmentMember_2c2b6d74-ca9b-4bec-925f-099dbeb988b3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_1323c1f1-a6f1-475f-bd00-574a1a7e972c" xlink:to="loc_srt_RestatementAdjustmentMember_2c2b6d74-ca9b-4bec-925f-099dbeb988b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioPreviouslyReportedMember_033210d4-8b23-43fc-aaf5-49dcbb96f1a7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioPreviouslyReportedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_1323c1f1-a6f1-475f-bd00-574a1a7e972c" xlink:to="loc_srt_ScenarioPreviouslyReportedMember_033210d4-8b23-43fc-aaf5-49dcbb96f1a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_126e232d-48a8-4a73-a399-96b292c02294" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestAndFeeIncomeLoansAndLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_00c51554-f0d9-40b3-ab4f-691664dee9cf" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_126e232d-48a8-4a73-a399-96b292c02294" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_AccretionOfDiscountsFinancingReceivables_b1ffa3ec-2fcb-428d-b4b2-84db333e2339" xlink:href="afrm-20250630.xsd#afrm_AccretionOfDiscountsFinancingReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_00c51554-f0d9-40b3-ab4f-691664dee9cf" xlink:to="loc_afrm_AccretionOfDiscountsFinancingReceivables_b1ffa3ec-2fcb-428d-b4b2-84db333e2339" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_AmortizationOfPremiumsFinancingReceivables_fdeb0f97-95b3-46cf-a0e8-ffcab8bbd614" xlink:href="afrm-20250630.xsd#afrm_AmortizationOfPremiumsFinancingReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_00c51554-f0d9-40b3-ab4f-691664dee9cf" xlink:to="loc_afrm_AmortizationOfPremiumsFinancingReceivables_fdeb0f97-95b3-46cf-a0e8-ffcab8bbd614" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAccruedInterestWriteoff_3c65cb8a-0eef-4dcb-b529-adce605ed79c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAccruedInterestWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_00c51554-f0d9-40b3-ab4f-691664dee9cf" xlink:to="loc_us-gaap_FinancingReceivableAccruedInterestWriteoff_3c65cb8a-0eef-4dcb-b529-adce605ed79c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_e794370a-5f77-4cbd-8487-1ba3d2608e94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestAndDividendIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_00c51554-f0d9-40b3-ab4f-691664dee9cf" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating_e794370a-5f77-4cbd-8487-1ba3d2608e94" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAccruedInterestWriteoff_d00217e7-f45e-4505-92ba-96705ca28ff2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAccruedInterestWriteoff"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/RevenueAdditionalInformationDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#RevenueAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/RevenueAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_fbce4810-e6f3-4859-b6c7-1f77388fb878" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_e18f9ff7-3b0e-4b10-a314-fb6327572431" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_fbce4810-e6f3-4859-b6c7-1f77388fb878" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_e18f9ff7-3b0e-4b10-a314-fb6327572431" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_f2e847e3-e35d-45e3-9d37-db11da4a81df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_e18f9ff7-3b0e-4b10-a314-fb6327572431" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_f2e847e3-e35d-45e3-9d37-db11da4a81df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_f2e847e3-e35d-45e3-9d37-db11da4a81df_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_f2e847e3-e35d-45e3-9d37-db11da4a81df" xlink:to="loc_us-gaap_RelatedPartyDomain_f2e847e3-e35d-45e3-9d37-db11da4a81df_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_eff78dbe-5f8c-4ccd-a0e5-a6b3dd3bc52f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_f2e847e3-e35d-45e3-9d37-db11da4a81df" xlink:to="loc_us-gaap_RelatedPartyDomain_eff78dbe-5f8c-4ccd-a0e5-a6b3dd3bc52f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_8ebae4c2-b1b4-4902-88ab-a6f083b1ce82" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_eff78dbe-5f8c-4ccd-a0e5-a6b3dd3bc52f" xlink:to="loc_srt_AffiliatedEntityMember_8ebae4c2-b1b4-4902-88ab-a6f083b1ce82" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_b1a9f619-987a-4b69-a7c9-cfa4fd5268c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_fbce4810-e6f3-4859-b6c7-1f77388fb878" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_b1a9f619-987a-4b69-a7c9-cfa4fd5268c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableThresholdPeriodPastDueSuspendedAccruedInterest_146c058e-d535-49b9-8406-d622a14dea21" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableThresholdPeriodPastDueSuspendedAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_fbce4810-e6f3-4859-b6c7-1f77388fb878" xlink:to="loc_afrm_FinancingReceivableThresholdPeriodPastDueSuspendedAccruedInterest_146c058e-d535-49b9-8406-d622a14dea21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_e2fd8229-a35a-42bf-a639-0395c53fd24d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_fbce4810-e6f3-4859-b6c7-1f77388fb878" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_e2fd8229-a35a-42bf-a639-0395c53fd24d" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/LoansHeldforInvestmentandAllowanceforCreditLossesAdditionalInformationDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#LoansHeldforInvestmentandAllowanceforCreditLossesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/LoansHeldforInvestmentandAllowanceforCreditLossesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_4eed5f91-eea7-4770-bae1-b5d0cb8ff1e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_e57512bb-0c18-44c2-a5f3-d9588664118f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_4eed5f91-eea7-4770-bae1-b5d0cb8ff1e7" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_e57512bb-0c18-44c2-a5f3-d9588664118f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_f47666c1-bed9-460e-a9a2-06c840948ec8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_e57512bb-0c18-44c2-a5f3-d9588664118f" xlink:to="loc_srt_RangeAxis_f47666c1-bed9-460e-a9a2-06c840948ec8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f47666c1-bed9-460e-a9a2-06c840948ec8_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_f47666c1-bed9-460e-a9a2-06c840948ec8" xlink:to="loc_srt_RangeMember_f47666c1-bed9-460e-a9a2-06c840948ec8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e04bacd8-1a9e-4e61-8a39-ba575b11e370" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_f47666c1-bed9-460e-a9a2-06c840948ec8" xlink:to="loc_srt_RangeMember_e04bacd8-1a9e-4e61-8a39-ba575b11e370" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_fa0c4609-7d69-49fb-acb4-28da6e22d034" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_e04bacd8-1a9e-4e61-8a39-ba575b11e370" xlink:to="loc_srt_MaximumMember_fa0c4609-7d69-49fb-acb4-28da6e22d034" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_786cacb0-d66e-4b76-9b57-506b4e981d9e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_e04bacd8-1a9e-4e61-8a39-ba575b11e370" xlink:to="loc_srt_MinimumMember_786cacb0-d66e-4b76-9b57-506b4e981d9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossLoanPurchased_c7a1a73c-b444-43ab-9168-fb851da95d57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossLoanPurchased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_4eed5f91-eea7-4770-bae1-b5d0cb8ff1e7" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossLoanPurchased_c7a1a73c-b444-43ab-9168-fb851da95d57" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableExcludingAccruedInterestOriginatedLoans_98f7364d-4962-48a9-be14-50e6fa805305" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableExcludingAccruedInterestOriginatedLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_4eed5f91-eea7-4770-bae1-b5d0cb8ff1e7" xlink:to="loc_afrm_FinancingReceivableExcludingAccruedInterestOriginatedLoans_98f7364d-4962-48a9-be14-50e6fa805305" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableLoanTerm_54900d85-b5ae-4013-bd8c-324085bc66d7" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableLoanTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_4eed5f91-eea7-4770-bae1-b5d0cb8ff1e7" xlink:to="loc_afrm_FinancingReceivableLoanTerm_54900d85-b5ae-4013-bd8c-324085bc66d7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableITACCreditQualityIndicator_25ac500f-f65c-4560-abdf-99d7c059ccb1" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableITACCreditQualityIndicator"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_4eed5f91-eea7-4770-bae1-b5d0cb8ff1e7" xlink:to="loc_afrm_FinancingReceivableITACCreditQualityIndicator_25ac500f-f65c-4560-abdf-99d7c059ccb1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableThresholdPeriodPastDue_32053b31-078c-411d-9efb-c2d2fc2f8d3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableThresholdPeriodPastDue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_4eed5f91-eea7-4770-bae1-b5d0cb8ff1e7" xlink:to="loc_us-gaap_FinancingReceivableThresholdPeriodPastDue_32053b31-078c-411d-9efb-c2d2fc2f8d3a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableThresholdPeriodPastDueSuspendedAccruedInterest_065999d0-c824-43d6-9d6b-5af7ca05a5f3" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableThresholdPeriodPastDueSuspendedAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_4eed5f91-eea7-4770-bae1-b5d0cb8ff1e7" xlink:to="loc_afrm_FinancingReceivableThresholdPeriodPastDueSuspendedAccruedInterest_065999d0-c824-43d6-9d6b-5af7ca05a5f3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableModifiedNumberOfDeferrals_4298016d-ad23-4628-b959-095b048d542b" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableModifiedNumberOfDeferrals"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_4eed5f91-eea7-4770-bae1-b5d0cb8ff1e7" xlink:to="loc_afrm_FinancingReceivableModifiedNumberOfDeferrals_4298016d-ad23-4628-b959-095b048d542b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableModifiedLengthOfDeferralTerm_538bbc7d-0d18-4b0c-818f-83145a174bf0" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableModifiedLengthOfDeferralTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_4eed5f91-eea7-4770-bae1-b5d0cb8ff1e7" xlink:to="loc_afrm_FinancingReceivableModifiedLengthOfDeferralTerm_538bbc7d-0d18-4b0c-818f-83145a174bf0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableModifiedLengthOfRemainingTermMaximum_ae42a03d-5f57-4840-a097-4e384be4683f" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableModifiedLengthOfRemainingTermMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_4eed5f91-eea7-4770-bae1-b5d0cb8ff1e7" xlink:to="loc_afrm_FinancingReceivableModifiedLengthOfRemainingTermMaximum_ae42a03d-5f57-4840-a097-4e384be4683f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification_8e953efb-70a5-4c2b-b06d-641bdfc6547b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_4eed5f91-eea7-4770-bae1-b5d0cb8ff1e7" xlink:to="loc_us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification_8e953efb-70a5-4c2b-b06d-641bdfc6547b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedSubsequentDefault_523b6809-79bf-4ef0-9580-b0a60049d722" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestModifiedSubsequentDefault"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_4eed5f91-eea7-4770-bae1-b5d0cb8ff1e7" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedSubsequentDefault_523b6809-79bf-4ef0-9580-b0a60049d722" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/LoansHeldforInvestmentandAllowanceforCreditLossesScheduleofCreditQualitybyITACsScoreDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#LoansHeldforInvestmentandAllowanceforCreditLossesScheduleofCreditQualitybyITACsScoreDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/LoansHeldforInvestmentandAllowanceforCreditLossesScheduleofCreditQualitybyITACsScoreDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_ea09511b-0690-4bd7-a0bd-d6c5ac70fa4a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_9290aeb3-eb2a-4e78-812c-543202e91d46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_ea09511b-0690-4bd7-a0bd-d6c5ac70fa4a" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_9290aeb3-eb2a-4e78-812c-543202e91d46" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CreditScoreITACAxis_c618fa7e-3ae2-45c9-ae16-841bf773209f" xlink:href="afrm-20250630.xsd#afrm_CreditScoreITACAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_9290aeb3-eb2a-4e78-812c-543202e91d46" xlink:to="loc_afrm_CreditScoreITACAxis_c618fa7e-3ae2-45c9-ae16-841bf773209f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CreditScoreITACDomain_c618fa7e-3ae2-45c9-ae16-841bf773209f_default" xlink:href="afrm-20250630.xsd#afrm_CreditScoreITACDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_afrm_CreditScoreITACAxis_c618fa7e-3ae2-45c9-ae16-841bf773209f" xlink:to="loc_afrm_CreditScoreITACDomain_c618fa7e-3ae2-45c9-ae16-841bf773209f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CreditScoreITACDomain_99e62315-4904-4137-aafd-91c907c311fb" xlink:href="afrm-20250630.xsd#afrm_CreditScoreITACDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_afrm_CreditScoreITACAxis_c618fa7e-3ae2-45c9-ae16-841bf773209f" xlink:to="loc_afrm_CreditScoreITACDomain_99e62315-4904-4137-aafd-91c907c311fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ITACScoreGreaterThan96Member_fff19e3f-fa61-4c89-8116-01e36673fa63" xlink:href="afrm-20250630.xsd#afrm_ITACScoreGreaterThan96Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_CreditScoreITACDomain_99e62315-4904-4137-aafd-91c907c311fb" xlink:to="loc_afrm_ITACScoreGreaterThan96Member_fff19e3f-fa61-4c89-8116-01e36673fa63" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ITACScore94To96Member_c4bc2eac-8ff0-47d9-bcbc-7f9458757189" xlink:href="afrm-20250630.xsd#afrm_ITACScore94To96Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_CreditScoreITACDomain_99e62315-4904-4137-aafd-91c907c311fb" xlink:to="loc_afrm_ITACScore94To96Member_c4bc2eac-8ff0-47d9-bcbc-7f9458757189" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ITACScore90To94Member_5a065916-6afd-440d-9ffd-58d7ad36034a" xlink:href="afrm-20250630.xsd#afrm_ITACScore90To94Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_CreditScoreITACDomain_99e62315-4904-4137-aafd-91c907c311fb" xlink:to="loc_afrm_ITACScore90To94Member_5a065916-6afd-440d-9ffd-58d7ad36034a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ITACScoreLessThan90Member_54c7a2db-af3c-4097-8f82-7e121c3820b6" xlink:href="afrm-20250630.xsd#afrm_ITACScoreLessThan90Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_CreditScoreITACDomain_99e62315-4904-4137-aafd-91c907c311fb" xlink:to="loc_afrm_ITACScoreLessThan90Member_54c7a2db-af3c-4097-8f82-7e121c3820b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ITACScoreNoScoreMember_a2001003-0a48-4c00-9754-9469e4d25317" xlink:href="afrm-20250630.xsd#afrm_ITACScoreNoScoreMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_CreditScoreITACDomain_99e62315-4904-4137-aafd-91c907c311fb" xlink:to="loc_afrm_ITACScoreNoScoreMember_a2001003-0a48-4c00-9754-9469e4d25317" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_343ff695-f890-46cf-b874-deed3b2acaf8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_ea09511b-0690-4bd7-a0bd-d6c5ac70fa4a" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_343ff695-f890-46cf-b874-deed3b2acaf8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_8f53adfa-3e0d-43e5-a3d0-e206b4856a6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_343ff695-f890-46cf-b874-deed3b2acaf8" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_8f53adfa-3e0d-43e5-a3d0-e206b4856a6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_5a863949-dc8e-4f95-a007-ca5a93f33e50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_343ff695-f890-46cf-b874-deed3b2acaf8" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_5a863949-dc8e-4f95-a007-ca5a93f33e50" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_0dc214de-8adf-49b1-b011-4824c42ae890" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_343ff695-f890-46cf-b874-deed3b2acaf8" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_0dc214de-8adf-49b1-b011-4824c42ae890" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_1039b498-c3ff-4a2f-a8be-c7e6c7eb6c33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_343ff695-f890-46cf-b874-deed3b2acaf8" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_1039b498-c3ff-4a2f-a8be-c7e6c7eb6c33" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_c7faa337-38b3-4b0f-98f9-b71d07a364a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_343ff695-f890-46cf-b874-deed3b2acaf8" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_c7faa337-38b3-4b0f-98f9-b71d07a364a5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_ecdfb308-e0f3-40f7-aa9c-966b48123409" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_343ff695-f890-46cf-b874-deed3b2acaf8" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_ecdfb308-e0f3-40f7-aa9c-966b48123409" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableIncludingLoansHeldForSaleExcludingAccruedInterestBeforeAllowanceForCreditLoss_30c7523a-3373-458e-a2ab-3ac9497fd3b2" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableIncludingLoansHeldForSaleExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_343ff695-f890-46cf-b874-deed3b2acaf8" xlink:to="loc_afrm_FinancingReceivableIncludingLoansHeldForSaleExcludingAccruedInterestBeforeAllowanceForCreditLoss_30c7523a-3373-458e-a2ab-3ac9497fd3b2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecoveryAbstract_976a5fc9-f401-46c3-98ff-5f122f59c5d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecoveryAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_ea09511b-0690-4bd7-a0bd-d6c5ac70fa4a" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecoveryAbstract_976a5fc9-f401-46c3-98ff-5f122f59c5d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_6e54443a-1597-44f1-95ab-f18c3c4a2deb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecoveryAbstract_976a5fc9-f401-46c3-98ff-5f122f59c5d7" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_6e54443a-1597-44f1-95ab-f18c3c4a2deb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_77dc322c-c1d0-407b-9693-43eeafaea962" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_6e54443a-1597-44f1-95ab-f18c3c4a2deb" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_77dc322c-c1d0-407b-9693-43eeafaea962" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_08b84475-4c97-4869-af22-35a1c10729fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_6e54443a-1597-44f1-95ab-f18c3c4a2deb" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_08b84475-4c97-4869-af22-35a1c10729fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_4f0558f6-e4d2-4353-935d-04ad9bcf3748" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_6e54443a-1597-44f1-95ab-f18c3c4a2deb" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_4f0558f6-e4d2-4353-935d-04ad9bcf3748" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_d4887574-91c4-43eb-ad31-493d920764c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_6e54443a-1597-44f1-95ab-f18c3c4a2deb" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_d4887574-91c4-43eb-ad31-493d920764c9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_fb0fe84b-d3f6-4756-91fa-71af0955d113" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_6e54443a-1597-44f1-95ab-f18c3c4a2deb" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_fb0fe84b-d3f6-4756-91fa-71af0955d113" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_31cbaee7-e49f-434e-8e9d-e8c1bf6d27bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_6e54443a-1597-44f1-95ab-f18c3c4a2deb" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_31cbaee7-e49f-434e-8e9d-e8c1bf6d27bd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_96139293-1a0b-46e9-8be0-6cf19549dd8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_6e54443a-1597-44f1-95ab-f18c3c4a2deb" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_96139293-1a0b-46e9-8be0-6cf19549dd8e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecoveryByOriginationYearAbstract_f45503e8-96d7-4cb8-96f1-74f95edfd1f2" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecoveryByOriginationYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecoveryAbstract_976a5fc9-f401-46c3-98ff-5f122f59c5d7" xlink:to="loc_afrm_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecoveryByOriginationYearAbstract_f45503e8-96d7-4cb8-96f1-74f95edfd1f2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearRecoveries_44ea2e78-cb99-4b21-bd44-4124a9fac1b2" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearRecoveries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecoveryByOriginationYearAbstract_f45503e8-96d7-4cb8-96f1-74f95edfd1f2" xlink:to="loc_afrm_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearRecoveries_44ea2e78-cb99-4b21-bd44-4124a9fac1b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearRecoveries_7f49ccf4-9114-4610-8a72-29b2b10ed811" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearRecoveries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecoveryByOriginationYearAbstract_f45503e8-96d7-4cb8-96f1-74f95edfd1f2" xlink:to="loc_afrm_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearRecoveries_7f49ccf4-9114-4610-8a72-29b2b10ed811" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearRecoveries_2c18ac49-dc2e-4b29-8a6b-bc6335c15d9d" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearRecoveries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecoveryByOriginationYearAbstract_f45503e8-96d7-4cb8-96f1-74f95edfd1f2" xlink:to="loc_afrm_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearRecoveries_2c18ac49-dc2e-4b29-8a6b-bc6335c15d9d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearRecoveries_9dd04071-0494-44ce-87c8-aa0ea490d84a" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearRecoveries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecoveryByOriginationYearAbstract_f45503e8-96d7-4cb8-96f1-74f95edfd1f2" xlink:to="loc_afrm_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearRecoveries_9dd04071-0494-44ce-87c8-aa0ea490d84a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearRecoveries_b6e4114f-ece7-4355-b130-681c459aba5a" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearRecoveries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecoveryByOriginationYearAbstract_f45503e8-96d7-4cb8-96f1-74f95edfd1f2" xlink:to="loc_afrm_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearRecoveries_b6e4114f-ece7-4355-b130-681c459aba5a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearRecoveries_0e9ba37b-70cc-48e9-b486-d8b962db1cbe" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearRecoveries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecoveryByOriginationYearAbstract_f45503e8-96d7-4cb8-96f1-74f95edfd1f2" xlink:to="loc_afrm_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearRecoveries_0e9ba37b-70cc-48e9-b486-d8b962db1cbe" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery_cdb0204d-a210-4054-87b2-24e750ef4146" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecoveryByOriginationYearAbstract_f45503e8-96d7-4cb8-96f1-74f95edfd1f2" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery_cdb0204d-a210-4054-87b2-24e750ef4146" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteOffRecoveriesNet_989d8155-de1e-4e08-95c1-211fe897012a" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteOffRecoveriesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecoveryAbstract_976a5fc9-f401-46c3-98ff-5f122f59c5d7" xlink:to="loc_afrm_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteOffRecoveriesNet_989d8155-de1e-4e08-95c1-211fe897012a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteOffRecoveriesNet_083dc3da-8066-4aa0-a4ae-ce5fe499861c" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteOffRecoveriesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecoveryAbstract_976a5fc9-f401-46c3-98ff-5f122f59c5d7" xlink:to="loc_afrm_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteOffRecoveriesNet_083dc3da-8066-4aa0-a4ae-ce5fe499861c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteOffRecoveriesNet_14937e56-8601-4b27-a7ec-4b77f821a0ac" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteOffRecoveriesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecoveryAbstract_976a5fc9-f401-46c3-98ff-5f122f59c5d7" xlink:to="loc_afrm_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteOffRecoveriesNet_14937e56-8601-4b27-a7ec-4b77f821a0ac" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteOffRecoveriesNet_500b4d98-60fc-435b-aeb0-a980e570a480" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteOffRecoveriesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecoveryAbstract_976a5fc9-f401-46c3-98ff-5f122f59c5d7" xlink:to="loc_afrm_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteOffRecoveriesNet_500b4d98-60fc-435b-aeb0-a980e570a480" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteOffRecoveriesNet_6e851510-bf2a-4c6a-bfe4-26a8a383aee9" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteOffRecoveriesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecoveryAbstract_976a5fc9-f401-46c3-98ff-5f122f59c5d7" xlink:to="loc_afrm_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteOffRecoveriesNet_6e851510-bf2a-4c6a-bfe4-26a8a383aee9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteOffRecoveriesNet_3c18a3ca-d371-46a1-86d5-b00e076a6e17" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteOffRecoveriesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecoveryAbstract_976a5fc9-f401-46c3-98ff-5f122f59c5d7" xlink:to="loc_afrm_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteOffRecoveriesNet_3c18a3ca-d371-46a1-86d5-b00e076a6e17" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery_7a1d137a-2061-414c-a98d-7c44c56dcdf1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecoveryAbstract_976a5fc9-f401-46c3-98ff-5f122f59c5d7" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery_7a1d137a-2061-414c-a98d-7c44c56dcdf1" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/LoansHeldforInvestmentandAllowanceforCreditLossesScheduleofDelinquentFinancingReceivablesDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#LoansHeldforInvestmentandAllowanceforCreditLossesScheduleofDelinquentFinancingReceivablesDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/LoansHeldforInvestmentandAllowanceforCreditLossesScheduleofDelinquentFinancingReceivablesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_444351e9-17cd-4930-91f8-f3f0e00f92e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_845bdf1a-2955-4d76-a884-f8aeca4b9020" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivablesPastDueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_444351e9-17cd-4930-91f8-f3f0e00f92e9" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_845bdf1a-2955-4d76-a884-f8aeca4b9020" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_de6105dd-c857-44fa-ac0c-c61c3ac58723" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_845bdf1a-2955-4d76-a884-f8aeca4b9020" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_de6105dd-c857-44fa-ac0c-c61c3ac58723" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_de6105dd-c857-44fa-ac0c-c61c3ac58723_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_de6105dd-c857-44fa-ac0c-c61c3ac58723" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_de6105dd-c857-44fa-ac0c-c61c3ac58723_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_374d6458-fc48-47c6-8405-aa075f7ea735" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_de6105dd-c857-44fa-ac0c-c61c3ac58723" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_374d6458-fc48-47c6-8405-aa075f7ea735" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetNotPastDueMember_0c21b4dd-99ec-4505-98be-4d941a45daa4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialAssetNotPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_374d6458-fc48-47c6-8405-aa075f7ea735" xlink:to="loc_us-gaap_FinancialAssetNotPastDueMember_0c21b4dd-99ec-4505-98be-4d941a45daa4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancialAsset4To29DaysPastDueMember_ef1c5d86-d0a3-4ad3-9c9b-261b8b01afdb" xlink:href="afrm-20250630.xsd#afrm_FinancialAsset4To29DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_374d6458-fc48-47c6-8405-aa075f7ea735" xlink:to="loc_afrm_FinancialAsset4To29DaysPastDueMember_ef1c5d86-d0a3-4ad3-9c9b-261b8b01afdb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_a85e6d34-4010-4764-befa-c8539160600c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables30To59DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_374d6458-fc48-47c6-8405-aa075f7ea735" xlink:to="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_a85e6d34-4010-4764-befa-c8539160600c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_630d540f-bc81-4148-976b-802df95284dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables60To89DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_374d6458-fc48-47c6-8405-aa075f7ea735" xlink:to="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_630d540f-bc81-4148-976b-802df95284dc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_6c30afc1-d832-402d-a294-1dad40c60398" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_374d6458-fc48-47c6-8405-aa075f7ea735" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_6c30afc1-d832-402d-a294-1dad40c60398" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_870e596c-e4d5-4aec-b046-ae553ff58270" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_444351e9-17cd-4930-91f8-f3f0e00f92e9" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_870e596c-e4d5-4aec-b046-ae553ff58270" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing_dd8075c3-7fb6-448e-a106-2c71bbeb78d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_444351e9-17cd-4930-91f8-f3f0e00f92e9" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing_dd8075c3-7fb6-448e-a106-2c71bbeb78d3" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/LoansHeldforInvestmentandAllowanceforCreditLossesScheduleOfAmortizedCostBasisOfLoansDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#LoansHeldforInvestmentandAllowanceforCreditLossesScheduleOfAmortizedCostBasisOfLoansDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/LoansHeldforInvestmentandAllowanceforCreditLossesScheduleOfAmortizedCostBasisOfLoansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_da26fe60-7dc4-41eb-8ff4-32e00a71dc82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_59c11e61-f69c-421b-8494-dbd4e2db4e28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_da26fe60-7dc4-41eb-8ff4-32e00a71dc82" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_59c11e61-f69c-421b-8494-dbd4e2db4e28" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationAxis_7c24eb8a-b2dd-4e29-83f5-b2047465df79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanRestructuringModificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_59c11e61-f69c-421b-8494-dbd4e2db4e28" xlink:to="loc_us-gaap_LoanRestructuringModificationAxis_7c24eb8a-b2dd-4e29-83f5-b2047465df79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationDomain_7c24eb8a-b2dd-4e29-83f5-b2047465df79_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanRestructuringModificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LoanRestructuringModificationAxis_7c24eb8a-b2dd-4e29-83f5-b2047465df79" xlink:to="loc_us-gaap_LoanRestructuringModificationDomain_7c24eb8a-b2dd-4e29-83f5-b2047465df79_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationDomain_10db49f7-8fef-4fc1-b833-2216c6067801" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanRestructuringModificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LoanRestructuringModificationAxis_7c24eb8a-b2dd-4e29-83f5-b2047465df79" xlink:to="loc_us-gaap_LoanRestructuringModificationDomain_10db49f7-8fef-4fc1-b833-2216c6067801" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentDeferralMember_832ae3b2-d92f-462a-9d43-4de03ec58a5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentDeferralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_10db49f7-8fef-4fc1-b833-2216c6067801" xlink:to="loc_us-gaap_PaymentDeferralMember_832ae3b2-d92f-462a-9d43-4de03ec58a5b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_LoanReAmortizationMember_c399d5ca-93e8-4eb2-acd6-7e4e1480feb2" xlink:href="afrm-20250630.xsd#afrm_LoanReAmortizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_10db49f7-8fef-4fc1-b833-2216c6067801" xlink:to="loc_afrm_LoanReAmortizationMember_c399d5ca-93e8-4eb2-acd6-7e4e1480feb2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod_a2213f69-1af3-4c71-8c7c-5ef02b0bdaa3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_da26fe60-7dc4-41eb-8ff4-32e00a71dc82" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod_a2213f69-1af3-4c71-8c7c-5ef02b0bdaa3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent_a6a1e9ed-5c08-47b7-bd82-a3e41407a6ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_da26fe60-7dc4-41eb-8ff4-32e00a71dc82" xlink:to="loc_us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent_a6a1e9ed-5c08-47b7-bd82-a3e41407a6ab" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/LoansHeldforInvestmentandAllowanceforCreditLossesScheduleofDelinquencyStatusDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#LoansHeldforInvestmentandAllowanceforCreditLossesScheduleofDelinquencyStatusDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/LoansHeldforInvestmentandAllowanceforCreditLossesScheduleofDelinquencyStatusDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_290624ad-c626-4d4e-89e4-377029361482" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_64bd160f-aa42-44eb-822a-1e9dbe0d23ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivablesPastDueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_290624ad-c626-4d4e-89e4-377029361482" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_64bd160f-aa42-44eb-822a-1e9dbe0d23ba" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_8aabfe72-5c75-4919-a136-41e63f6949ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_64bd160f-aa42-44eb-822a-1e9dbe0d23ba" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_8aabfe72-5c75-4919-a136-41e63f6949ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_8aabfe72-5c75-4919-a136-41e63f6949ab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_8aabfe72-5c75-4919-a136-41e63f6949ab" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_8aabfe72-5c75-4919-a136-41e63f6949ab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_5781f066-4300-4e81-b412-0add009a03db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_8aabfe72-5c75-4919-a136-41e63f6949ab" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_5781f066-4300-4e81-b412-0add009a03db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetNotPastDueMember_212b0c16-abee-4ae7-b1c3-d54c68b734f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialAssetNotPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_5781f066-4300-4e81-b412-0add009a03db" xlink:to="loc_us-gaap_FinancialAssetNotPastDueMember_212b0c16-abee-4ae7-b1c3-d54c68b734f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancialAsset4To29DaysPastDueMember_0de89318-225f-4f0b-8be5-fafa7fff62db" xlink:href="afrm-20250630.xsd#afrm_FinancialAsset4To29DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_5781f066-4300-4e81-b412-0add009a03db" xlink:to="loc_afrm_FinancialAsset4To29DaysPastDueMember_0de89318-225f-4f0b-8be5-fafa7fff62db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_c2027d62-ccba-43ad-aebb-e752f5a1cb9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables30To59DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_5781f066-4300-4e81-b412-0add009a03db" xlink:to="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_c2027d62-ccba-43ad-aebb-e752f5a1cb9b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_a43f492b-d1b8-42dc-8de5-72033c9c39ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables60To89DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_5781f066-4300-4e81-b412-0add009a03db" xlink:to="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_a43f492b-d1b8-42dc-8de5-72033c9c39ec" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_382469bd-7c3f-4dd9-97de-9392e4089fc2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_5781f066-4300-4e81-b412-0add009a03db" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_382469bd-7c3f-4dd9-97de-9392e4089fc2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationAxis_a78355c7-4d89-40f8-a2fb-668ce9fd78eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanRestructuringModificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_64bd160f-aa42-44eb-822a-1e9dbe0d23ba" xlink:to="loc_us-gaap_LoanRestructuringModificationAxis_a78355c7-4d89-40f8-a2fb-668ce9fd78eb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationDomain_a78355c7-4d89-40f8-a2fb-668ce9fd78eb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanRestructuringModificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LoanRestructuringModificationAxis_a78355c7-4d89-40f8-a2fb-668ce9fd78eb" xlink:to="loc_us-gaap_LoanRestructuringModificationDomain_a78355c7-4d89-40f8-a2fb-668ce9fd78eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationDomain_c8b340ec-48c9-4498-a9bf-232785bd585c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanRestructuringModificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LoanRestructuringModificationAxis_a78355c7-4d89-40f8-a2fb-668ce9fd78eb" xlink:to="loc_us-gaap_LoanRestructuringModificationDomain_c8b340ec-48c9-4498-a9bf-232785bd585c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentDeferralMember_3410913c-af40-49bf-901a-3ffbaacb0648" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentDeferralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_c8b340ec-48c9-4498-a9bf-232785bd585c" xlink:to="loc_us-gaap_PaymentDeferralMember_3410913c-af40-49bf-901a-3ffbaacb0648" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_LoanReAmortizationMember_0ea2b15b-77c7-45e1-b4bd-39749e56d13a" xlink:href="afrm-20250630.xsd#afrm_LoanReAmortizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_c8b340ec-48c9-4498-a9bf-232785bd585c" xlink:to="loc_afrm_LoanReAmortizationMember_0ea2b15b-77c7-45e1-b4bd-39749e56d13a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPast12Months_85497117-dc1e-4241-9356-83da4a361277" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPast12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_290624ad-c626-4d4e-89e4-377029361482" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPast12Months_85497117-dc1e-4241-9356-83da4a361277" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/AcquisitionsAdditionalInformationDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#AcquisitionsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/AcquisitionsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_ea27328a-6ab1-496f-a8ac-5dee3afddc78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_d8a85396-3009-4445-a563-4e37cc25c4af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ea27328a-6ab1-496f-a8ac-5dee3afddc78" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_d8a85396-3009-4445-a563-4e37cc25c4af" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_3c953356-f908-41f5-813c-fb8edaa405ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_d8a85396-3009-4445-a563-4e37cc25c4af" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_3c953356-f908-41f5-813c-fb8edaa405ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3c953356-f908-41f5-813c-fb8edaa405ae_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3c953356-f908-41f5-813c-fb8edaa405ae" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3c953356-f908-41f5-813c-fb8edaa405ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_528f5c86-1e10-4d33-9235-d9b5cf48d6e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3c953356-f908-41f5-813c-fb8edaa405ae" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_528f5c86-1e10-4d33-9235-d9b5cf48d6e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ButterHoldingsLtdMember_561b911f-a1dc-4950-8eaa-4d5ba937a287" xlink:href="afrm-20250630.xsd#afrm_ButterHoldingsLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_528f5c86-1e10-4d33-9235-d9b5cf48d6e0" xlink:to="loc_afrm_ButterHoldingsLtdMember_561b911f-a1dc-4950-8eaa-4d5ba937a287" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfBusinessesAcquired_b5f23693-fcd7-4ebe-b755-40489e372737" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfBusinessesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ea27328a-6ab1-496f-a8ac-5dee3afddc78" xlink:to="loc_us-gaap_NumberOfBusinessesAcquired_b5f23693-fcd7-4ebe-b755-40489e372737" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_cf78f6c2-7a18-40ef-a4a2-bcd98d0b05ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ea27328a-6ab1-496f-a8ac-5dee3afddc78" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_cf78f6c2-7a18-40ef-a4a2-bcd98d0b05ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_474037e8-1871-450c-9f80-756dd35cf640" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ea27328a-6ab1-496f-a8ac-5dee3afddc78" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_474037e8-1871-450c-9f80-756dd35cf640" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_b8c5ab4c-f6ca-4662-878d-d6a3c76f103c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ea27328a-6ab1-496f-a8ac-5dee3afddc78" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_b8c5ab4c-f6ca-4662-878d-d6a3c76f103c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_1160ad10-8cb7-4557-80e2-b951837e1e7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ea27328a-6ab1-496f-a8ac-5dee3afddc78" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_1160ad10-8cb7-4557-80e2-b951837e1e7e" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/AcquisitionsScheduleofAcquisitionConsiderationTransferredDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#AcquisitionsScheduleofAcquisitionConsiderationTransferredDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/AcquisitionsScheduleofAcquisitionConsiderationTransferredDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_ba94caf8-93fb-4970-8cd0-340c0be8bf15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_7aba0f0a-4684-4aeb-9ade-ceaac43facd7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba94caf8-93fb-4970-8cd0-340c0be8bf15" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_7aba0f0a-4684-4aeb-9ade-ceaac43facd7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_aa79f9e8-2fb9-4cd7-9fa2-c21829584531" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_7aba0f0a-4684-4aeb-9ade-ceaac43facd7" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_aa79f9e8-2fb9-4cd7-9fa2-c21829584531" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_aa79f9e8-2fb9-4cd7-9fa2-c21829584531_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_aa79f9e8-2fb9-4cd7-9fa2-c21829584531" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_aa79f9e8-2fb9-4cd7-9fa2-c21829584531_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_20a83994-fa2a-459f-80e0-afd520987f2d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_aa79f9e8-2fb9-4cd7-9fa2-c21829584531" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_20a83994-fa2a-459f-80e0-afd520987f2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ButterHoldingsLtdMember_d70d52b1-986c-4028-a2e0-7c5489523e39" xlink:href="afrm-20250630.xsd#afrm_ButterHoldingsLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_20a83994-fa2a-459f-80e0-afd520987f2d" xlink:to="loc_afrm_ButterHoldingsLtdMember_d70d52b1-986c-4028-a2e0-7c5489523e39" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_83a11f3d-6a37-4722-9eec-5f4468209077" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba94caf8-93fb-4970-8cd0-340c0be8bf15" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_83a11f3d-6a37-4722-9eec-5f4468209077" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_8067191e-a2a7-4720-9cbf-28e2d7abe4c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba94caf8-93fb-4970-8cd0-340c0be8bf15" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_8067191e-a2a7-4720-9cbf-28e2d7abe4c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_a67ebf36-123f-4ec0-9040-721983b90089" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba94caf8-93fb-4970-8cd0-340c0be8bf15" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_a67ebf36-123f-4ec0-9040-721983b90089" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/AcquisitionsScheduleofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#AcquisitionsScheduleofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/AcquisitionsScheduleofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_85c80938-2c6e-415a-a585-2a81e6b3aee1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_a7216634-c513-4a30-aed9-fec283352d45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85c80938-2c6e-415a-a585-2a81e6b3aee1" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_a7216634-c513-4a30-aed9-fec283352d45" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_0131b5a6-804f-4590-9649-b3ce9f83f3e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_a7216634-c513-4a30-aed9-fec283352d45" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_0131b5a6-804f-4590-9649-b3ce9f83f3e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0131b5a6-804f-4590-9649-b3ce9f83f3e3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_0131b5a6-804f-4590-9649-b3ce9f83f3e3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0131b5a6-804f-4590-9649-b3ce9f83f3e3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e585889d-017f-40a0-b235-ed5dc0eb180d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_0131b5a6-804f-4590-9649-b3ce9f83f3e3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e585889d-017f-40a0-b235-ed5dc0eb180d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ButterHoldingsLtdMember_21b49577-8412-4434-9f62-7217e5a06f0c" xlink:href="afrm-20250630.xsd#afrm_ButterHoldingsLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e585889d-017f-40a0-b235-ed5dc0eb180d" xlink:to="loc_afrm_ButterHoldingsLtdMember_21b49577-8412-4434-9f62-7217e5a06f0c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_862eea76-7df9-47d1-8a50-84675c1fafc7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85c80938-2c6e-415a-a585-2a81e6b3aee1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_862eea76-7df9-47d1-8a50-84675c1fafc7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoans_a56d81b5-b731-458f-b601-fca659c5fddb" xlink:href="afrm-20250630.xsd#afrm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85c80938-2c6e-415a-a585-2a81e6b3aee1" xlink:to="loc_afrm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoans_a56d81b5-b731-458f-b601-fca659c5fddb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedReceivables_2f3f8f42-eb23-47b5-8659-8e63544f139c" xlink:href="afrm-20250630.xsd#afrm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85c80938-2c6e-415a-a585-2a81e6b3aee1" xlink:to="loc_afrm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedReceivables_2f3f8f42-eb23-47b5-8659-8e63544f139c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_a7c6cef7-b7c7-4b9a-abe1-79f1e2b9c5ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85c80938-2c6e-415a-a585-2a81e6b3aee1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_a7c6cef7-b7c7-4b9a-abe1-79f1e2b9c5ac" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets_97405a45-5f00-4abc-be54-1a3e0bd2880f" xlink:href="afrm-20250630.xsd#afrm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85c80938-2c6e-415a-a585-2a81e6b3aee1" xlink:to="loc_afrm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets_97405a45-5f00-4abc-be54-1a3e0bd2880f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_1a420e90-59e2-4a72-bded-38e017a867c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85c80938-2c6e-415a-a585-2a81e6b3aee1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_1a420e90-59e2-4a72-bded-38e017a867c5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_16020624-cb48-4fda-93c1-a3f7a0ccfdfa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85c80938-2c6e-415a-a585-2a81e6b3aee1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_16020624-cb48-4fda-93c1-a3f7a0ccfdfa" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpensesAndOtherLiabilities_783fdc05-1baa-4bcf-98cb-740053a0c33c" xlink:href="afrm-20250630.xsd#afrm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpensesAndOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85c80938-2c6e-415a-a585-2a81e6b3aee1" xlink:to="loc_afrm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpensesAndOtherLiabilities_783fdc05-1baa-4bcf-98cb-740053a0c33c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_21e35131-658a-4c3f-853d-5a3e25618baf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85c80938-2c6e-415a-a585-2a81e6b3aee1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_21e35131-658a-4c3f-853d-5a3e25618baf" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_36b2d406-b32d-4e1c-aab4-f83b92cd49de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85c80938-2c6e-415a-a585-2a81e6b3aee1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_36b2d406-b32d-4e1c-aab4-f83b92cd49de" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_d16d4e24-294e-4580-825c-b3c05421795c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85c80938-2c6e-415a-a585-2a81e6b3aee1" xlink:to="loc_us-gaap_Goodwill_d16d4e24-294e-4580-825c-b3c05421795c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_fc706852-3590-43ec-bc22-7fabfd67cfae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85c80938-2c6e-415a-a585-2a81e6b3aee1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_fc706852-3590-43ec-bc22-7fabfd67cfae" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/AcquisitionsScheduleofFiniteLivedIntangibleAssetsAcquiredasPartofBusinessCombinationDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#AcquisitionsScheduleofFiniteLivedIntangibleAssetsAcquiredasPartofBusinessCombinationDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/AcquisitionsScheduleofFiniteLivedIntangibleAssetsAcquiredasPartofBusinessCombinationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_9946d417-309d-485a-9009-fdd7e2d8dc4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_64e97567-0d67-43af-8396-b0738530ab5d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9946d417-309d-485a-9009-fdd7e2d8dc4e" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_64e97567-0d67-43af-8396-b0738530ab5d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_36b72670-1d0c-4910-970d-a65bd29dd838" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_64e97567-0d67-43af-8396-b0738530ab5d" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_36b72670-1d0c-4910-970d-a65bd29dd838" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_36b72670-1d0c-4910-970d-a65bd29dd838_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_36b72670-1d0c-4910-970d-a65bd29dd838" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_36b72670-1d0c-4910-970d-a65bd29dd838_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8c493454-36fc-4a5c-a940-a4270a442944" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_36b72670-1d0c-4910-970d-a65bd29dd838" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8c493454-36fc-4a5c-a940-a4270a442944" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ButterHoldingsLtdMember_dba0d3c3-7fbb-45b7-8148-ce1a63f82956" xlink:href="afrm-20250630.xsd#afrm_ButterHoldingsLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8c493454-36fc-4a5c-a940-a4270a442944" xlink:to="loc_afrm_ButterHoldingsLtdMember_dba0d3c3-7fbb-45b7-8148-ce1a63f82956" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_418c0a72-8eb5-4986-865b-63469d03e5f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_64e97567-0d67-43af-8396-b0738530ab5d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_418c0a72-8eb5-4986-865b-63469d03e5f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_418c0a72-8eb5-4986-865b-63469d03e5f7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_418c0a72-8eb5-4986-865b-63469d03e5f7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_418c0a72-8eb5-4986-865b-63469d03e5f7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b6255dc7-f611-495b-ba38-d15a87a59820" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_418c0a72-8eb5-4986-865b-63469d03e5f7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b6255dc7-f611-495b-ba38-d15a87a59820" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicenseMember_72eb8850-0c5d-47a1-9369-103361d69fbc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LicenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b6255dc7-f611-495b-ba38-d15a87a59820" xlink:to="loc_us-gaap_LicenseMember_72eb8850-0c5d-47a1-9369-103361d69fbc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefinitelivedIntangibleAssetsAcquired_08441002-85b3-472e-9b19-74d7a0de5534" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefinitelivedIntangibleAssetsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9946d417-309d-485a-9009-fdd7e2d8dc4e" xlink:to="loc_us-gaap_IndefinitelivedIntangibleAssetsAcquired_08441002-85b3-472e-9b19-74d7a0de5534" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/BalanceSheetComponentsScheduleofPropertyEquipmentandSoftwareNetDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#BalanceSheetComponentsScheduleofPropertyEquipmentandSoftwareNetDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/BalanceSheetComponentsScheduleofPropertyEquipmentandSoftwareNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_ef62d534-2639-46a9-bf97-62bc6c7bb9b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_357112b4-42a6-4b4c-8336-fb88b24bcb04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_ef62d534-2639-46a9-bf97-62bc6c7bb9b1" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_357112b4-42a6-4b4c-8336-fb88b24bcb04" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_f15c9735-b128-4b85-9355-6cd7546cb1c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_357112b4-42a6-4b4c-8336-fb88b24bcb04" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_f15c9735-b128-4b85-9355-6cd7546cb1c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f15c9735-b128-4b85-9355-6cd7546cb1c7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_f15c9735-b128-4b85-9355-6cd7546cb1c7" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f15c9735-b128-4b85-9355-6cd7546cb1c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f03a1823-a64b-46c2-a9c3-e220e3d8ad66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_f15c9735-b128-4b85-9355-6cd7546cb1c7" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f03a1823-a64b-46c2-a9c3-e220e3d8ad66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_aaaac464-9933-4db2-864f-a82b18579fa6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f03a1823-a64b-46c2-a9c3-e220e3d8ad66" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_aaaac464-9933-4db2-864f-a82b18579fa6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_4c951a9c-5147-4c0a-9a56-0dd2d3f8fc73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f03a1823-a64b-46c2-a9c3-e220e3d8ad66" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_4c951a9c-5147-4c0a-9a56-0dd2d3f8fc73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerEquipmentMember_6357eec6-b163-4ee8-9fc1-34d473d669d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComputerEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f03a1823-a64b-46c2-a9c3-e220e3d8ad66" xlink:to="loc_us-gaap_ComputerEquipmentMember_6357eec6-b163-4ee8-9fc1-34d473d669d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FurnitureAndEquipmentMember_966af113-77c3-4900-9e04-bb262ad2e30b" xlink:href="afrm-20250630.xsd#afrm_FurnitureAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f03a1823-a64b-46c2-a9c3-e220e3d8ad66" xlink:to="loc_afrm_FurnitureAndEquipmentMember_966af113-77c3-4900-9e04-bb262ad2e30b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_9dcf7d2b-ca34-4077-9179-30cedf147201" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_ef62d534-2639-46a9-bf97-62bc6c7bb9b1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_9dcf7d2b-ca34-4077-9179-30cedf147201" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_3e2031d6-c978-4027-8fac-4aa834f251f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_ef62d534-2639-46a9-bf97-62bc6c7bb9b1" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_3e2031d6-c978-4027-8fac-4aa834f251f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_9d8c5f12-e96d-4854-876a-82a39f062ac4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_ef62d534-2639-46a9-bf97-62bc6c7bb9b1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_9d8c5f12-e96d-4854-876a-82a39f062ac4" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/BalanceSheetComponentsAdditionalInformationDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#BalanceSheetComponentsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/BalanceSheetComponentsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_99bd88c0-be5f-4020-8cb6-b96250aa3966" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_3b4915b4-31d4-4969-8b95-9870c1988699" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_99bd88c0-be5f-4020-8cb6-b96250aa3966" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_3b4915b4-31d4-4969-8b95-9870c1988699" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementAssetTypeAxis_aa17acd4-ca15-473a-b668-a2b24d60dc02" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementAssetTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_3b4915b4-31d4-4969-8b95-9870c1988699" xlink:to="loc_afrm_CommercialAgreementAssetTypeAxis_aa17acd4-ca15-473a-b668-a2b24d60dc02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementAssetTypeDomain_aa17acd4-ca15-473a-b668-a2b24d60dc02_default" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementAssetTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_afrm_CommercialAgreementAssetTypeAxis_aa17acd4-ca15-473a-b668-a2b24d60dc02" xlink:to="loc_afrm_CommercialAgreementAssetTypeDomain_aa17acd4-ca15-473a-b668-a2b24d60dc02_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementAssetTypeDomain_f7e3a7d3-d29a-4f71-bd2b-26891a5ae37b" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementAssetTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_afrm_CommercialAgreementAssetTypeAxis_aa17acd4-ca15-473a-b668-a2b24d60dc02" xlink:to="loc_afrm_CommercialAgreementAssetTypeDomain_f7e3a7d3-d29a-4f71-bd2b-26891a5ae37b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementAmazonMember_092ffa5a-0189-4a1a-8171-0d28945f4c62" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementAmazonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_CommercialAgreementAssetTypeDomain_f7e3a7d3-d29a-4f71-bd2b-26891a5ae37b" xlink:to="loc_afrm_CommercialAgreementAmazonMember_092ffa5a-0189-4a1a-8171-0d28945f4c62" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementShopifyMember_7f18cb2f-6bfb-4cbb-aed2-8b9b52db4aff" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementShopifyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_CommercialAgreementAssetTypeDomain_f7e3a7d3-d29a-4f71-bd2b-26891a5ae37b" xlink:to="loc_afrm_CommercialAgreementShopifyMember_7f18cb2f-6bfb-4cbb-aed2-8b9b52db4aff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_71c9162c-d0e7-4f22-8eb9-6e19beedebb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_99bd88c0-be5f-4020-8cb6-b96250aa3966" xlink:to="loc_us-gaap_Depreciation_71c9162c-d0e7-4f22-8eb9-6e19beedebb8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_335887d7-884b-4144-b474-a4618a482fed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ImpairmentOfLongLivedAssetsHeldForUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_99bd88c0-be5f-4020-8cb6-b96250aa3966" xlink:to="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_335887d7-884b-4144-b474-a4618a482fed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_6f9ff9d3-f9d7-4128-9394-70527d32d439" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_99bd88c0-be5f-4020-8cb6-b96250aa3966" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_6f9ff9d3-f9d7-4128-9394-70527d32d439" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_d7a6d61d-c767-4473-a438-d729fe8e9fcb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_99bd88c0-be5f-4020-8cb6-b96250aa3966" xlink:to="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_d7a6d61d-c767-4473-a438-d729fe8e9fcb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_2e20c1cd-fd61-4786-bddf-bee47fe7eb93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_99bd88c0-be5f-4020-8cb6-b96250aa3966" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_2e20c1cd-fd61-4786-bddf-bee47fe7eb93" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_90c49ed4-9432-4c92-a2eb-de4840ad550b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_99bd88c0-be5f-4020-8cb6-b96250aa3966" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_90c49ed4-9432-4c92-a2eb-de4840ad550b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementAssetWarrantsVestedAssetRecognized_f97a7ace-bb47-4433-978e-705b387cafb0" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementAssetWarrantsVestedAssetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_99bd88c0-be5f-4020-8cb6-b96250aa3966" xlink:to="loc_afrm_CommercialAgreementAssetWarrantsVestedAssetRecognized_f97a7ace-bb47-4433-978e-705b387cafb0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementAssetAmortizationPeriod_c7d950b5-7096-4ac6-a4db-6736cf61e00f" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementAssetAmortizationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_99bd88c0-be5f-4020-8cb6-b96250aa3966" xlink:to="loc_afrm_CommercialAgreementAssetAmortizationPeriod_c7d950b5-7096-4ac6-a4db-6736cf61e00f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_AmortizationOfSalesAndMarketingExpense_1f3e6399-a9be-4415-99b5-1fa100c5f355" xlink:href="afrm-20250630.xsd#afrm_AmortizationOfSalesAndMarketingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_99bd88c0-be5f-4020-8cb6-b96250aa3966" xlink:to="loc_afrm_AmortizationOfSalesAndMarketingExpense_1f3e6399-a9be-4415-99b5-1fa100c5f355" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementAssetAccumulatedAmortization_f1486036-f37e-4b45-948a-0974d6a322a2" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementAssetAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_99bd88c0-be5f-4020-8cb6-b96250aa3966" xlink:to="loc_afrm_CommercialAgreementAssetAccumulatedAmortization_f1486036-f37e-4b45-948a-0974d6a322a2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementAssetAmortizationPeriodRemainingExpectedBenefitPeriod_75579bc1-7560-4237-a71c-75018462889e" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementAssetAmortizationPeriodRemainingExpectedBenefitPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_99bd88c0-be5f-4020-8cb6-b96250aa3966" xlink:to="loc_afrm_CommercialAgreementAssetAmortizationPeriodRemainingExpectedBenefitPeriod_75579bc1-7560-4237-a71c-75018462889e" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementAssetAmortizationExpense_d208d887-e08c-4b8f-8a44-ae0e9e2b5282" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementAssetAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_99bd88c0-be5f-4020-8cb6-b96250aa3966" xlink:to="loc_afrm_CommercialAgreementAssetAmortizationExpense_d208d887-e08c-4b8f-8a44-ae0e9e2b5282" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementAssetRemainingUsefulLife_34288340-ea82-4a23-8602-f1f28d711d16" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementAssetRemainingUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_99bd88c0-be5f-4020-8cb6-b96250aa3966" xlink:to="loc_afrm_CommercialAgreementAssetRemainingUsefulLife_34288340-ea82-4a23-8602-f1f28d711d16" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/BalanceSheetComponentsScheduleofIntangibleAssetsDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#BalanceSheetComponentsScheduleofIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/BalanceSheetComponentsScheduleofIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_9c9dd8e9-95fe-426a-840a-61746f3c85c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_081a5fd4-683a-45f3-8012-0049b364cbe7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_9c9dd8e9-95fe-426a-840a-61746f3c85c3" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_081a5fd4-683a-45f3-8012-0049b364cbe7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b564642f-84c7-49f0-9f9f-dbd1fbbe72b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_081a5fd4-683a-45f3-8012-0049b364cbe7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b564642f-84c7-49f0-9f9f-dbd1fbbe72b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b564642f-84c7-49f0-9f9f-dbd1fbbe72b7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b564642f-84c7-49f0-9f9f-dbd1fbbe72b7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b564642f-84c7-49f0-9f9f-dbd1fbbe72b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_52ee983d-31c2-4310-86e7-2f2a657e4839" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b564642f-84c7-49f0-9f9f-dbd1fbbe72b7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_52ee983d-31c2-4310-86e7-2f2a657e4839" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_MerchantRelationshipsMember_27053764-7d14-473a-b222-54e420967b2a" xlink:href="afrm-20250630.xsd#afrm_MerchantRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_52ee983d-31c2-4310-86e7-2f2a657e4839" xlink:to="loc_afrm_MerchantRelationshipsMember_27053764-7d14-473a-b222-54e420967b2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_e28d084d-d0f2-40cf-8f97-f9a5d25cf70d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_52ee983d-31c2-4310-86e7-2f2a657e4839" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_e28d084d-d0f2-40cf-8f97-f9a5d25cf70d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_AssembledWorkforceMember_f299a511-4a83-455d-bf3a-3a0043f4b1ee" xlink:href="afrm-20250630.xsd#afrm_AssembledWorkforceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_52ee983d-31c2-4310-86e7-2f2a657e4839" xlink:to="loc_afrm_AssembledWorkforceMember_f299a511-4a83-455d-bf3a-3a0043f4b1ee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_TrademarksAndDomainsMember_9f460402-a7e8-4301-becc-72a5430e5c45" xlink:href="afrm-20250630.xsd#afrm_TrademarksAndDomainsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_52ee983d-31c2-4310-86e7-2f2a657e4839" xlink:to="loc_afrm_TrademarksAndDomainsMember_9f460402-a7e8-4301-becc-72a5430e5c45" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_59606ee7-1026-4908-94ba-57ce44916a78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_081a5fd4-683a-45f3-8012-0049b364cbe7" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_59606ee7-1026-4908-94ba-57ce44916a78" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_59606ee7-1026-4908-94ba-57ce44916a78_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_59606ee7-1026-4908-94ba-57ce44916a78" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_59606ee7-1026-4908-94ba-57ce44916a78_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_3b63e694-d783-4c1f-a84f-b298539c3987" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_59606ee7-1026-4908-94ba-57ce44916a78" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_3b63e694-d783-4c1f-a84f-b298539c3987" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_TrademarksLicensesAndDomainsMember_4d7fb5c8-03e0-4301-b9b4-8269c73bcf1a" xlink:href="afrm-20250630.xsd#afrm_TrademarksLicensesAndDomainsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_3b63e694-d783-4c1f-a84f-b298539c3987" xlink:to="loc_afrm_TrademarksLicensesAndDomainsMember_4d7fb5c8-03e0-4301-b9b4-8269c73bcf1a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_7007896e-f47f-497c-926d-e3f15e007914" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_3b63e694-d783-4c1f-a84f-b298539c3987" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_7007896e-f47f-497c-926d-e3f15e007914" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_2f7fc8d8-1e1b-4f3f-96c0-f7d4a33fa87a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_9c9dd8e9-95fe-426a-840a-61746f3c85c3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_2f7fc8d8-1e1b-4f3f-96c0-f7d4a33fa87a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_b2fb2aa4-6ce3-4ab7-bde0-8fd4696a8bd8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_9c9dd8e9-95fe-426a-840a-61746f3c85c3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_b2fb2aa4-6ce3-4ab7-bde0-8fd4696a8bd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_a8ca630a-0144-41c2-8ce8-7dce7a7f8ce4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_9c9dd8e9-95fe-426a-840a-61746f3c85c3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_a8ca630a-0144-41c2-8ce8-7dce7a7f8ce4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1_053f8e31-7b94-4311-83e5-740a9ebfb102" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_9c9dd8e9-95fe-426a-840a-61746f3c85c3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1_053f8e31-7b94-4311-83e5-740a9ebfb102" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_b381bdfa-9a0b-48be-9486-cea7b484c3df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_9c9dd8e9-95fe-426a-840a-61746f3c85c3" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_b381bdfa-9a0b-48be-9486-cea7b484c3df" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_30613dce-cdca-4ea2-8b3d-551b147c78d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_9c9dd8e9-95fe-426a-840a-61746f3c85c3" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_30613dce-cdca-4ea2-8b3d-551b147c78d4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_IntangibleAssetsNetExcludingGoodwillAndNotYetPlacedIntoService_b6042544-a10f-4a61-a056-651284312e26" xlink:href="afrm-20250630.xsd#afrm_IntangibleAssetsNetExcludingGoodwillAndNotYetPlacedIntoService"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_9c9dd8e9-95fe-426a-840a-61746f3c85c3" xlink:to="loc_afrm_IntangibleAssetsNetExcludingGoodwillAndNotYetPlacedIntoService_b6042544-a10f-4a61-a056-651284312e26" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/LeasesAdditionalInformationDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#LeasesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/LeasesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_eb72859a-e20c-44a9-aacd-e28ab35277e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_dff5be0b-6d93-4402-a9bf-290e301d540a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_eb72859a-e20c-44a9-aacd-e28ab35277e8" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_dff5be0b-6d93-4402-a9bf-290e301d540a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_36108c78-9453-41d7-8f1c-c6750970d70c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_dff5be0b-6d93-4402-a9bf-290e301d540a" xlink:to="loc_srt_RangeAxis_36108c78-9453-41d7-8f1c-c6750970d70c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_36108c78-9453-41d7-8f1c-c6750970d70c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_36108c78-9453-41d7-8f1c-c6750970d70c" xlink:to="loc_srt_RangeMember_36108c78-9453-41d7-8f1c-c6750970d70c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_88e2b60d-70f4-4910-9eeb-db9dc5ab2478" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_36108c78-9453-41d7-8f1c-c6750970d70c" xlink:to="loc_srt_RangeMember_88e2b60d-70f4-4910-9eeb-db9dc5ab2478" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_d7c28e06-0290-4cdf-a787-6f11e18e57fe" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_88e2b60d-70f4-4910-9eeb-db9dc5ab2478" xlink:to="loc_srt_MinimumMember_d7c28e06-0290-4cdf-a787-6f11e18e57fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_ac44b170-d98a-49fa-ac9a-dd54a7aab5a8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_88e2b60d-70f4-4910-9eeb-db9dc5ab2478" xlink:to="loc_srt_MaximumMember_ac44b170-d98a-49fa-ac9a-dd54a7aab5a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_3898991b-1b6b-4308-9f58-6b7c76a507f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_dff5be0b-6d93-4402-a9bf-290e301d540a" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_3898991b-1b6b-4308-9f58-6b7c76a507f9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_3898991b-1b6b-4308-9f58-6b7c76a507f9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_3898991b-1b6b-4308-9f58-6b7c76a507f9" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_3898991b-1b6b-4308-9f58-6b7c76a507f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_27ce9602-e9bb-4ac0-bafd-3bf9591adb9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_3898991b-1b6b-4308-9f58-6b7c76a507f9" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_27ce9602-e9bb-4ac0-bafd-3bf9591adb9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RestrictedCashMember_6246195c-99ea-4322-9a47-98117ad8fdc1" xlink:href="afrm-20250630.xsd#afrm_RestrictedCashMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_27ce9602-e9bb-4ac0-bafd-3bf9591adb9c" xlink:to="loc_afrm_RestrictedCashMember_6246195c-99ea-4322-9a47-98117ad8fdc1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestmentsMember_8b8bb390-3e21-4601-8450-8853fc2a4a1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_27ce9602-e9bb-4ac0-bafd-3bf9591adb9c" xlink:to="loc_us-gaap_OtherInvestmentsMember_8b8bb390-3e21-4601-8450-8853fc2a4a1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_LesseeOperatingLeaseTerminationNoticePeriod_df964414-076c-4c89-a49f-e024830ce6de" xlink:href="afrm-20250630.xsd#afrm_LesseeOperatingLeaseTerminationNoticePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_eb72859a-e20c-44a9-aacd-e28ab35277e8" xlink:to="loc_afrm_LesseeOperatingLeaseTerminationNoticePeriod_df964414-076c-4c89-a49f-e024830ce6de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseRemainingLeaseTerm_ea92782b-a468-40e1-9e6f-f6ca94cc7005" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseRemainingLeaseTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_eb72859a-e20c-44a9-aacd-e28ab35277e8" xlink:to="loc_us-gaap_LesseeOperatingLeaseRemainingLeaseTerm_ea92782b-a468-40e1-9e6f-f6ca94cc7005" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RequiredCollateralAssetsPledgedAsCollateral_7f8ace24-54f5-4f59-84ad-c52b46c52ec6" xlink:href="afrm-20250630.xsd#afrm_RequiredCollateralAssetsPledgedAsCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_eb72859a-e20c-44a9-aacd-e28ab35277e8" xlink:to="loc_afrm_RequiredCollateralAssetsPledgedAsCollateral_7f8ace24-54f5-4f59-84ad-c52b46c52ec6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseImpairmentLoss_3c8754fb-6868-4fbf-9e81-d552948c2784" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_eb72859a-e20c-44a9-aacd-e28ab35277e8" xlink:to="loc_us-gaap_OperatingLeaseImpairmentLoss_3c8754fb-6868-4fbf-9e81-d552948c2784" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubleaseIncome_264ec5f0-4702-40fe-9187-529b6be4bcce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubleaseIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_eb72859a-e20c-44a9-aacd-e28ab35277e8" xlink:to="loc_us-gaap_SubleaseIncome_264ec5f0-4702-40fe-9187-529b6be4bcce" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/DebtScheduleofComponentsofDebtDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#DebtScheduleofComponentsofDebtDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/DebtScheduleofComponentsofDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_18f738ea-8230-4757-afe8-cf33d7a6d32b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_b5edf843-ced7-4f81-9db2-07149d91dde8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_18f738ea-8230-4757-afe8-cf33d7a6d32b" xlink:to="loc_us-gaap_DebtInstrumentTable_b5edf843-ced7-4f81-9db2-07149d91dde8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_878186ba-f60d-4bb6-a3cc-6195605e6753" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b5edf843-ced7-4f81-9db2-07149d91dde8" xlink:to="loc_us-gaap_CreditFacilityAxis_878186ba-f60d-4bb6-a3cc-6195605e6753" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_878186ba-f60d-4bb6-a3cc-6195605e6753_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_878186ba-f60d-4bb6-a3cc-6195605e6753" xlink:to="loc_us-gaap_CreditFacilityDomain_878186ba-f60d-4bb6-a3cc-6195605e6753_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_7ad54fb7-159a-4777-8e0f-87f7dcd2c214" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_878186ba-f60d-4bb6-a3cc-6195605e6753" xlink:to="loc_us-gaap_CreditFacilityDomain_7ad54fb7-159a-4777-8e0f-87f7dcd2c214" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_USWarehouseFacilitiesMember_909decc3-1686-41f7-8c0f-eee888650914" xlink:href="afrm-20250630.xsd#afrm_USWarehouseFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7ad54fb7-159a-4777-8e0f-87f7dcd2c214" xlink:to="loc_afrm_USWarehouseFacilitiesMember_909decc3-1686-41f7-8c0f-eee888650914" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_InternationalWarehouseFacilitiesMember_2b667b7d-a759-468b-8621-860bcfacf614" xlink:href="afrm-20250630.xsd#afrm_InternationalWarehouseFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7ad54fb7-159a-4777-8e0f-87f7dcd2c214" xlink:to="loc_afrm_InternationalWarehouseFacilitiesMember_2b667b7d-a759-468b-8621-860bcfacf614" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_VariableFundingNotesMember_2174e1ca-8edc-4da5-948d-cf953143611a" xlink:href="afrm-20250630.xsd#afrm_VariableFundingNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7ad54fb7-159a-4777-8e0f-87f7dcd2c214" xlink:to="loc_afrm_VariableFundingNotesMember_2174e1ca-8edc-4da5-948d-cf953143611a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SalesAndRepurchaseAgreementsMember_dae27370-0a0c-422a-a526-67c4640012ec" xlink:href="afrm-20250630.xsd#afrm_SalesAndRepurchaseAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7ad54fb7-159a-4777-8e0f-87f7dcd2c214" xlink:to="loc_afrm_SalesAndRepurchaseAgreementsMember_dae27370-0a0c-422a-a526-67c4640012ec" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_e6a6b14f-e87e-4a9d-b638-22f0709ca396" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7ad54fb7-159a-4777-8e0f-87f7dcd2c214" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_e6a6b14f-e87e-4a9d-b638-22f0709ca396" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_93491f0b-258c-476f-a38e-d49232c2ee78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b5edf843-ced7-4f81-9db2-07149d91dde8" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_93491f0b-258c-476f-a38e-d49232c2ee78" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_93491f0b-258c-476f-a38e-d49232c2ee78_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_93491f0b-258c-476f-a38e-d49232c2ee78" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_93491f0b-258c-476f-a38e-d49232c2ee78_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5224abff-55c8-442a-8ea6-baafae0d7ce8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_93491f0b-258c-476f-a38e-d49232c2ee78" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5224abff-55c8-442a-8ea6-baafae0d7ce8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_8c4f3d17-b9a0-40a8-9579-a51bfe74445e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5224abff-55c8-442a-8ea6-baafae0d7ce8" xlink:to="loc_us-gaap_LineOfCreditMember_8c4f3d17-b9a0-40a8-9579-a51bfe74445e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableOtherPayablesMember_5280dbe3-69ab-4a32-ba38-1181919b06fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesPayableOtherPayablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5224abff-55c8-442a-8ea6-baafae0d7ce8" xlink:to="loc_us-gaap_NotesPayableOtherPayablesMember_5280dbe3-69ab-4a32-ba38-1181919b06fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_7c403d1f-687a-435a-962a-dffc34c54bdd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5224abff-55c8-442a-8ea6-baafae0d7ce8" xlink:to="loc_us-gaap_SecuredDebtMember_7c403d1f-687a-435a-962a-dffc34c54bdd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_1bc46d6c-eadf-4eff-a5ec-88746306ea10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5224abff-55c8-442a-8ea6-baafae0d7ce8" xlink:to="loc_us-gaap_ConvertibleDebtMember_1bc46d6c-eadf-4eff-a5ec-88746306ea10" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_76059026-379b-4809-b064-7e2d1c166ba6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5224abff-55c8-442a-8ea6-baafae0d7ce8" xlink:to="loc_us-gaap_UnsecuredDebtMember_76059026-379b-4809-b064-7e2d1c166ba6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_643bf100-d128-464a-9d7b-681b1615cb57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b5edf843-ced7-4f81-9db2-07149d91dde8" xlink:to="loc_us-gaap_DebtInstrumentAxis_643bf100-d128-464a-9d7b-681b1615cb57" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_643bf100-d128-464a-9d7b-681b1615cb57_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_643bf100-d128-464a-9d7b-681b1615cb57" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_643bf100-d128-464a-9d7b-681b1615cb57_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_dafc1965-6452-4689-93ce-3c54aa2c33db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_643bf100-d128-464a-9d7b-681b1615cb57" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_dafc1965-6452-4689-93ce-3c54aa2c33db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FundingDebtMember_b8a0c71f-a412-4c51-b7b7-9c7948530309" xlink:href="afrm-20250630.xsd#afrm_FundingDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_dafc1965-6452-4689-93ce-3c54aa2c33db" xlink:to="loc_afrm_FundingDebtMember_b8a0c71f-a412-4c51-b7b7-9c7948530309" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_NotesIssuedBySecuritizationTrustsMember_ba800e72-cc88-4643-9794-d8fadcd98690" xlink:href="afrm-20250630.xsd#afrm_NotesIssuedBySecuritizationTrustsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_dafc1965-6452-4689-93ce-3c54aa2c33db" xlink:to="loc_afrm_NotesIssuedBySecuritizationTrustsMember_ba800e72-cc88-4643-9794-d8fadcd98690" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ConvertibleSeniorNotesDue2026Member_78cc9df3-1613-45c3-884e-28a8e7ca818b" xlink:href="afrm-20250630.xsd#afrm_ConvertibleSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_dafc1965-6452-4689-93ce-3c54aa2c33db" xlink:to="loc_afrm_ConvertibleSeniorNotesDue2026Member_78cc9df3-1613-45c3-884e-28a8e7ca818b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ConvertibleSeniorNotesDue2029Member_4495e6e8-595c-431d-b6b7-1e3b446e97a5" xlink:href="afrm-20250630.xsd#afrm_ConvertibleSeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_dafc1965-6452-4689-93ce-3c54aa2c33db" xlink:to="loc_afrm_ConvertibleSeniorNotesDue2029Member_4495e6e8-595c-431d-b6b7-1e3b446e97a5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_547578b1-5355-423b-9a97-2cdb180fdcec" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b5edf843-ced7-4f81-9db2-07149d91dde8" xlink:to="loc_srt_RangeAxis_547578b1-5355-423b-9a97-2cdb180fdcec" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_547578b1-5355-423b-9a97-2cdb180fdcec_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_547578b1-5355-423b-9a97-2cdb180fdcec" xlink:to="loc_srt_RangeMember_547578b1-5355-423b-9a97-2cdb180fdcec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_473a6709-bdf4-4a5b-8991-f12524f683fc" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_547578b1-5355-423b-9a97-2cdb180fdcec" xlink:to="loc_srt_RangeMember_473a6709-bdf4-4a5b-8991-f12524f683fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_d9e1fcdf-4bac-4620-9118-09a7962b7f26" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_473a6709-bdf4-4a5b-8991-f12524f683fc" xlink:to="loc_srt_MinimumMember_d9e1fcdf-4bac-4620-9118-09a7962b7f26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_be2e4c72-434b-4b93-bda4-7ef1d6857bf8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_473a6709-bdf4-4a5b-8991-f12524f683fc" xlink:to="loc_srt_MaximumMember_be2e4c72-434b-4b93-bda4-7ef1d6857bf8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusAxis_577aac64-818d-4c7c-830a-6f7b3cec1d88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b5edf843-ced7-4f81-9db2-07149d91dde8" xlink:to="loc_us-gaap_PledgedStatusAxis_577aac64-818d-4c7c-830a-6f7b3cec1d88" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_577aac64-818d-4c7c-830a-6f7b3cec1d88_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PledgedStatusAxis_577aac64-818d-4c7c-830a-6f7b3cec1d88" xlink:to="loc_us-gaap_PledgedStatusDomain_577aac64-818d-4c7c-830a-6f7b3cec1d88_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_80c5baf4-ceeb-45d5-b07d-f722b5d7d815" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PledgedStatusAxis_577aac64-818d-4c7c-830a-6f7b3cec1d88" xlink:to="loc_us-gaap_PledgedStatusDomain_80c5baf4-ceeb-45d5-b07d-f722b5d7d815" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetPledgedAsCollateralMember_e1c45fd9-89d0-4b06-9086-e22fd594170a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetPledgedAsCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PledgedStatusDomain_80c5baf4-ceeb-45d5-b07d-f722b5d7d815" xlink:to="loc_us-gaap_AssetPledgedAsCollateralMember_e1c45fd9-89d0-4b06-9086-e22fd594170a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_25d6551e-de74-4987-a01e-4c1053ffbddd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_18f738ea-8230-4757-afe8-cf33d7a6d32b" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_25d6551e-de74-4987-a01e-4c1053ffbddd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_9afdd975-4523-49cf-800a-20cdfa8547f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_18f738ea-8230-4757-afe8-cf33d7a6d32b" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_9afdd975-4523-49cf-800a-20cdfa8547f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6a852b0f-6fc4-49b7-8189-bee0aab6f610" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_18f738ea-8230-4757-afe8-cf33d7a6d32b" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6a852b0f-6fc4-49b7-8189-bee0aab6f610" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_4bc3029c-b418-4938-a680-a4f3b1395f7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_18f738ea-8230-4757-afe8-cf33d7a6d32b" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_4bc3029c-b418-4938-a680-a4f3b1395f7a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_TotalLineOfCreditFacilityMaximumBorrowingCapacityAndDebtInstrumentFaceAmount_02ece4e3-6329-47c6-8b9a-c1e314e16da9" xlink:href="afrm-20250630.xsd#afrm_TotalLineOfCreditFacilityMaximumBorrowingCapacityAndDebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_18f738ea-8230-4757-afe8-cf33d7a6d32b" xlink:to="loc_afrm_TotalLineOfCreditFacilityMaximumBorrowingCapacityAndDebtInstrumentFaceAmount_02ece4e3-6329-47c6-8b9a-c1e314e16da9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_1b6240d9-0cb3-437f-8937-b70aa5e7d89b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_18f738ea-8230-4757-afe8-cf33d7a6d32b" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_1b6240d9-0cb3-437f-8937-b70aa5e7d89b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_28b5d08f-e37f-44fe-bd72-c3a115f55e32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_18f738ea-8230-4757-afe8-cf33d7a6d32b" xlink:to="loc_us-gaap_LongTermDebt_28b5d08f-e37f-44fe-bd72-c3a115f55e32" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/DebtScheduleoftheInterestExpenseRecognizedRelatedtotheConvertibleSeniorNotesDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#DebtScheduleoftheInterestExpenseRecognizedRelatedtotheConvertibleSeniorNotesDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/DebtScheduleoftheInterestExpenseRecognizedRelatedtotheConvertibleSeniorNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_b74f7eca-0e0a-4426-a1ab-0487331e6507" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_b513fd8e-963e-4137-8799-a09a13943813" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_b74f7eca-0e0a-4426-a1ab-0487331e6507" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_b513fd8e-963e-4137-8799-a09a13943813" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_a394d517-e6b2-4f9e-afe1-bbb52350c864" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_b513fd8e-963e-4137-8799-a09a13943813" xlink:to="loc_us-gaap_DebtInstrumentAxis_a394d517-e6b2-4f9e-afe1-bbb52350c864" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_a394d517-e6b2-4f9e-afe1-bbb52350c864_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_a394d517-e6b2-4f9e-afe1-bbb52350c864" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_a394d517-e6b2-4f9e-afe1-bbb52350c864_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_586b73c7-b246-41bf-820b-d01db4017135" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_a394d517-e6b2-4f9e-afe1-bbb52350c864" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_586b73c7-b246-41bf-820b-d01db4017135" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ConvertibleSeniorNotesDue2026Member_d79b04e7-e422-4eab-bd9e-c39428e77e30" xlink:href="afrm-20250630.xsd#afrm_ConvertibleSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_586b73c7-b246-41bf-820b-d01db4017135" xlink:to="loc_afrm_ConvertibleSeniorNotesDue2026Member_d79b04e7-e422-4eab-bd9e-c39428e77e30" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ConvertibleSeniorNotesDue2029Member_f14bfb4c-8e3a-43bc-996d-d616dc6481c3" xlink:href="afrm-20250630.xsd#afrm_ConvertibleSeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_586b73c7-b246-41bf-820b-d01db4017135" xlink:to="loc_afrm_ConvertibleSeniorNotesDue2029Member_f14bfb4c-8e3a-43bc-996d-d616dc6481c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_c84f2726-58c6-4a9a-a2f2-41d108b3d1b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_b513fd8e-963e-4137-8799-a09a13943813" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_c84f2726-58c6-4a9a-a2f2-41d108b3d1b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_c84f2726-58c6-4a9a-a2f2-41d108b3d1b7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_c84f2726-58c6-4a9a-a2f2-41d108b3d1b7" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_c84f2726-58c6-4a9a-a2f2-41d108b3d1b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e27d2b47-6b1b-4382-8da3-3485d16fd668" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_c84f2726-58c6-4a9a-a2f2-41d108b3d1b7" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e27d2b47-6b1b-4382-8da3-3485d16fd668" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_b1b729c8-4905-4f79-ba7b-e0ca6485bd1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_e27d2b47-6b1b-4382-8da3-3485d16fd668" xlink:to="loc_us-gaap_ConvertibleDebtMember_b1b729c8-4905-4f79-ba7b-e0ca6485bd1f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_1e6933a0-2913-4c57-a7a7-5d0777d40fa8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_b74f7eca-0e0a-4426-a1ab-0487331e6507" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_1e6933a0-2913-4c57-a7a7-5d0777d40fa8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_27932d7a-7a7f-47d8-8b84-1ad565af8dcb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_b74f7eca-0e0a-4426-a1ab-0487331e6507" xlink:to="loc_us-gaap_InterestExpense_27932d7a-7a7f-47d8-8b84-1ad565af8dcb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_b536ef4c-831a-4e54-9199-f549b19ad515" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_b74f7eca-0e0a-4426-a1ab-0487331e6507" xlink:to="loc_us-gaap_InterestExpenseDebt_b536ef4c-831a-4e54-9199-f549b19ad515" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/DebtAdditionalInformationDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#DebtAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/DebtAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_6e9a58ed-51cf-452c-8f39-ebecbf0967ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_6e9a58ed-51cf-452c-8f39-ebecbf0967ad" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_97e69d5b-595e-4309-b10f-cfb168cc6c08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_6e9a58ed-51cf-452c-8f39-ebecbf0967ad" xlink:to="loc_us-gaap_DebtInstrumentAxis_97e69d5b-595e-4309-b10f-cfb168cc6c08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_97e69d5b-595e-4309-b10f-cfb168cc6c08_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_97e69d5b-595e-4309-b10f-cfb168cc6c08" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_97e69d5b-595e-4309-b10f-cfb168cc6c08_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_5c9de648-4024-4dd2-9a54-761aaa456bb0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_97e69d5b-595e-4309-b10f-cfb168cc6c08" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_5c9de648-4024-4dd2-9a54-761aaa456bb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ConvertibleSeniorNotesDue2029Member_9e914448-b17c-4741-b997-ea42a2d05540" xlink:href="afrm-20250630.xsd#afrm_ConvertibleSeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_5c9de648-4024-4dd2-9a54-761aaa456bb0" xlink:to="loc_afrm_ConvertibleSeniorNotesDue2029Member_9e914448-b17c-4741-b997-ea42a2d05540" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ConvertibleSeniorNotesDue2026Member_0b3243f1-0f51-49a1-b96b-059961f45aec" xlink:href="afrm-20250630.xsd#afrm_ConvertibleSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_5c9de648-4024-4dd2-9a54-761aaa456bb0" xlink:to="loc_afrm_ConvertibleSeniorNotesDue2026Member_0b3243f1-0f51-49a1-b96b-059961f45aec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_41cc176f-02ec-424a-9ad0-24835b1eed49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_6e9a58ed-51cf-452c-8f39-ebecbf0967ad" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_41cc176f-02ec-424a-9ad0-24835b1eed49" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_41cc176f-02ec-424a-9ad0-24835b1eed49_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_41cc176f-02ec-424a-9ad0-24835b1eed49" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_41cc176f-02ec-424a-9ad0-24835b1eed49_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_ca822d4f-3c5a-4fe8-bf8c-89122545064f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_41cc176f-02ec-424a-9ad0-24835b1eed49" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_ca822d4f-3c5a-4fe8-bf8c-89122545064f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_107e91c7-fa5d-428c-bb5c-99547437f654" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_ca822d4f-3c5a-4fe8-bf8c-89122545064f" xlink:to="loc_us-gaap_ConvertibleDebtMember_107e91c7-fa5d-428c-bb5c-99547437f654" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_5fa58224-8e0d-48b4-8236-1841e12b1a7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_ca822d4f-3c5a-4fe8-bf8c-89122545064f" xlink:to="loc_us-gaap_LineOfCreditMember_5fa58224-8e0d-48b4-8236-1841e12b1a7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_DebtInstrumentConversionAxis_83ae763b-9862-4a13-8c4f-a8ed51acd066" xlink:href="afrm-20250630.xsd#afrm_DebtInstrumentConversionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_6e9a58ed-51cf-452c-8f39-ebecbf0967ad" xlink:to="loc_afrm_DebtInstrumentConversionAxis_83ae763b-9862-4a13-8c4f-a8ed51acd066" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_DebtInstrumentConversionDomain_83ae763b-9862-4a13-8c4f-a8ed51acd066_default" xlink:href="afrm-20250630.xsd#afrm_DebtInstrumentConversionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_afrm_DebtInstrumentConversionAxis_83ae763b-9862-4a13-8c4f-a8ed51acd066" xlink:to="loc_afrm_DebtInstrumentConversionDomain_83ae763b-9862-4a13-8c4f-a8ed51acd066_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_DebtInstrumentConversionDomain_58aa0551-4255-4124-a1b9-74c5498cc538" xlink:href="afrm-20250630.xsd#afrm_DebtInstrumentConversionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_afrm_DebtInstrumentConversionAxis_83ae763b-9862-4a13-8c4f-a8ed51acd066" xlink:to="loc_afrm_DebtInstrumentConversionDomain_58aa0551-4255-4124-a1b9-74c5498cc538" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ConversionPeriodOneMember_8a598c2a-6393-4dc9-91c2-3b6526d7eeef" xlink:href="afrm-20250630.xsd#afrm_ConversionPeriodOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_DebtInstrumentConversionDomain_58aa0551-4255-4124-a1b9-74c5498cc538" xlink:to="loc_afrm_ConversionPeriodOneMember_8a598c2a-6393-4dc9-91c2-3b6526d7eeef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ConversionPeriodTwoMember_489d0019-1cf0-4e50-9b31-5661deb20b12" xlink:href="afrm-20250630.xsd#afrm_ConversionPeriodTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_DebtInstrumentConversionDomain_58aa0551-4255-4124-a1b9-74c5498cc538" xlink:to="loc_afrm_ConversionPeriodTwoMember_489d0019-1cf0-4e50-9b31-5661deb20b12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_3a3a2694-06b5-4ef5-9d55-cec13a3a9878" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_6e9a58ed-51cf-452c-8f39-ebecbf0967ad" xlink:to="loc_us-gaap_CreditFacilityAxis_3a3a2694-06b5-4ef5-9d55-cec13a3a9878" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_3a3a2694-06b5-4ef5-9d55-cec13a3a9878_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_3a3a2694-06b5-4ef5-9d55-cec13a3a9878" xlink:to="loc_us-gaap_CreditFacilityDomain_3a3a2694-06b5-4ef5-9d55-cec13a3a9878_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_15815351-60e7-479b-b3ac-bf969f23106f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_3a3a2694-06b5-4ef5-9d55-cec13a3a9878" xlink:to="loc_us-gaap_CreditFacilityDomain_15815351-60e7-479b-b3ac-bf969f23106f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_b4ebd251-8837-4c70-81e2-bc639f6652bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_15815351-60e7-479b-b3ac-bf969f23106f" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_b4ebd251-8837-4c70-81e2-bc639f6652bc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_VariableRateComponentAxis_3ecbe3ba-e082-4751-a510-b51defcee57f" xlink:href="afrm-20250630.xsd#afrm_VariableRateComponentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_6e9a58ed-51cf-452c-8f39-ebecbf0967ad" xlink:to="loc_afrm_VariableRateComponentAxis_3ecbe3ba-e082-4751-a510-b51defcee57f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_VariableRateComponentDomain_3ecbe3ba-e082-4751-a510-b51defcee57f_default" xlink:href="afrm-20250630.xsd#afrm_VariableRateComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_afrm_VariableRateComponentAxis_3ecbe3ba-e082-4751-a510-b51defcee57f" xlink:to="loc_afrm_VariableRateComponentDomain_3ecbe3ba-e082-4751-a510-b51defcee57f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_VariableRateComponentDomain_b6960d52-fd88-41ed-ad16-217ae3c11367" xlink:href="afrm-20250630.xsd#afrm_VariableRateComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_afrm_VariableRateComponentAxis_3ecbe3ba-e082-4751-a510-b51defcee57f" xlink:to="loc_afrm_VariableRateComponentDomain_b6960d52-fd88-41ed-ad16-217ae3c11367" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_50eef000-e102-4b7f-a33a-e318650f28cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FederalFundsEffectiveSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_VariableRateComponentDomain_b6960d52-fd88-41ed-ad16-217ae3c11367" xlink:to="loc_us-gaap_FederalFundsEffectiveSwapRateMember_50eef000-e102-4b7f-a33a-e318650f28cb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_OneMonthSecuredOvernightFinancingRateSOFRMember_2a0318cb-272b-4bc2-8530-fffd09ff3ec1" xlink:href="afrm-20250630.xsd#afrm_OneMonthSecuredOvernightFinancingRateSOFRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_VariableRateComponentDomain_b6960d52-fd88-41ed-ad16-217ae3c11367" xlink:to="loc_afrm_OneMonthSecuredOvernightFinancingRateSOFRMember_2a0318cb-272b-4bc2-8530-fffd09ff3ec1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_20d5c1fc-6a79-43e8-9455-bb5203d473e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_afrm_VariableRateComponentDomain_b6960d52-fd88-41ed-ad16-217ae3c11367" xlink:to="loc_us-gaap_BaseRateMember_20d5c1fc-6a79-43e8-9455-bb5203d473e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_16e1cd97-7dd5-402e-8a21-eb6ffee034fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_16e1cd97-7dd5-402e-8a21-eb6ffee034fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_3cc8d9ab-3a63-41a2-b0ea-c7abb3bd9025" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_3cc8d9ab-3a63-41a2-b0ea-c7abb3bd9025" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_c629853d-1bda-4f0c-b2c7-6bc3451534f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_LineOfCredit_c629853d-1bda-4f0c-b2c7-6bc3451534f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_766df7cb-171d-4ee9-ad32-03cf3e395996" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_766df7cb-171d-4ee9-ad32-03cf3e395996" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_3ce446ac-62d8-49bf-875b-cdeafcd906e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_3ce446ac-62d8-49bf-875b-cdeafcd906e9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_f8c1db75-ee0d-49be-b4d6-d57f1756db86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_f8c1db75-ee0d-49be-b4d6-d57f1756db86" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_8c69e258-55ae-402d-98ef-59d606d3fe09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromDebtNetOfIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_8c69e258-55ae-402d-98ef-59d606d3fe09" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_cca2213e-badc-4568-938b-830660afcf51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentConvertibleConversionRatio1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_cca2213e-badc-4568-938b-830660afcf51" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_2e0d2219-fb9c-4b52-b497-0a904e54cd5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_2e0d2219-fb9c-4b52-b497-0a904e54cd5e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_adc268c2-122a-4c80-8c6d-ed0997c7d116" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentConvertibleThresholdTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_adc268c2-122a-4c80-8c6d-ed0997c7d116" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_5c79e479-6915-44d2-aa8e-513c63bfb6f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_5c79e479-6915-44d2-aa8e-513c63bfb6f0" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_0583226c-1c71-46e4-b56e-83326e1f0ac3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_0583226c-1c71-46e4-b56e-83326e1f0ac3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_DebtInstrumentConvertiblePeriodFollowingThresholdConsecutiveTradingDays_c6875db5-fe65-4276-a069-3f2b0c825e1e" xlink:href="afrm-20250630.xsd#afrm_DebtInstrumentConvertiblePeriodFollowingThresholdConsecutiveTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_afrm_DebtInstrumentConvertiblePeriodFollowingThresholdConsecutiveTradingDays_c6875db5-fe65-4276-a069-3f2b0c825e1e" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_MinimumPercentageOfTradingPriceToLastReportedSalePrice_ee967048-59dd-4e7d-b6b9-f68a664d543c" xlink:href="afrm-20250630.xsd#afrm_MinimumPercentageOfTradingPriceToLastReportedSalePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_afrm_MinimumPercentageOfTradingPriceToLastReportedSalePrice_ee967048-59dd-4e7d-b6b9-f68a664d543c" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_DebtInstrumentConvertibleTradingDayObservationPeriod_423ef831-b842-4984-ae6b-42ce680afe45" xlink:href="afrm-20250630.xsd#afrm_DebtInstrumentConvertibleTradingDayObservationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_afrm_DebtInstrumentConvertibleTradingDayObservationPeriod_423ef831-b842-4984-ae6b-42ce680afe45" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_36d78e2b-f670-4bbf-bb3c-cd128fc06e56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_36d78e2b-f670-4bbf-bb3c-cd128fc06e56" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_DebtInstrumentAuthorizedRepurchaseAmount_03676ac1-5c33-4e49-b2c9-0d3e95737070" xlink:href="afrm-20250630.xsd#afrm_DebtInstrumentAuthorizedRepurchaseAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_afrm_DebtInstrumentAuthorizedRepurchaseAmount_03676ac1-5c33-4e49-b2c9-0d3e95737070" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_82de1533-6f93-4925-9496-c4edac7e8308" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentRepurchasedFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_82de1533-6f93-4925-9496-c4edac7e8308" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfConvertibleDebt_b2f0d100-6bbf-42d7-939b-756fe8861035" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_RepaymentsOfConvertibleDebt_b2f0d100-6bbf-42d7-939b-756fe8861035" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_DebtInstrumentDebtRepurchasedDuringThePeriod_34327edc-f29f-4b73-b7de-f1dc67640b37" xlink:href="afrm-20250630.xsd#afrm_DebtInstrumentDebtRepurchasedDuringThePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_afrm_DebtInstrumentDebtRepurchasedDuringThePeriod_34327edc-f29f-4b73-b7de-f1dc67640b37" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_DebtInstrumentRepurchasedCarryingAmount_5ae3fe20-aac5-4246-8488-7ca789a90e79" xlink:href="afrm-20250630.xsd#afrm_DebtInstrumentRepurchasedCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_afrm_DebtInstrumentRepurchasedCarryingAmount_5ae3fe20-aac5-4246-8488-7ca789a90e79" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_493a5733-7312-47e6-909f-f9432ff57bbf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_493a5733-7312-47e6-909f-f9432ff57bbf" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchaseAmount_1e43a8da-b7e9-4feb-9217-09f1bf0e1d77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentRepurchaseAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_DebtInstrumentRepurchaseAmount_1e43a8da-b7e9-4feb-9217-09f1bf0e1d77" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_2a17b24c-940a-4c5c-8078-1c301331cea3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_85ff2b29-31bf-48dd-b580-b14c92857248" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_2a17b24c-940a-4c5c-8078-1c301331cea3" xlink:type="arc" order="23"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/SecuritizationsandVariableInterestEntitiesScheduleofAggregateCarryingValueofFinancialAssetsandLiabilitiesfromVIEsDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#SecuritizationsandVariableInterestEntitiesScheduleofAggregateCarryingValueofFinancialAssetsandLiabilitiesfromVIEsDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/SecuritizationsandVariableInterestEntitiesScheduleofAggregateCarryingValueofFinancialAssetsandLiabilitiesfromVIEsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_2c4250f1-232a-49f7-8690-71bc4a515c31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_bc6a3303-d5a9-4ff4-a958-481fc665075a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2c4250f1-232a-49f7-8690-71bc4a515c31" xlink:to="loc_us-gaap_DebtInstrumentTable_bc6a3303-d5a9-4ff4-a958-481fc665075a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_39956dd1-c83a-432c-85aa-c13f367cd845" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_bc6a3303-d5a9-4ff4-a958-481fc665075a" xlink:to="loc_srt_ConsolidatedEntitiesAxis_39956dd1-c83a-432c-85aa-c13f367cd845" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_39956dd1-c83a-432c-85aa-c13f367cd845_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_39956dd1-c83a-432c-85aa-c13f367cd845" xlink:to="loc_srt_ConsolidatedEntitiesDomain_39956dd1-c83a-432c-85aa-c13f367cd845_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_0d11d76f-5118-45ee-8502-296b5d67864f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_39956dd1-c83a-432c-85aa-c13f367cd845" xlink:to="loc_srt_ConsolidatedEntitiesDomain_0d11d76f-5118-45ee-8502-296b5d67864f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_117813a8-c241-4206-ac16-c61512b3a71d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_0d11d76f-5118-45ee-8502-296b5d67864f" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_117813a8-c241-4206-ac16-c61512b3a71d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_fb05ae1d-ad51-47fc-b537-657348b7a3c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_bc6a3303-d5a9-4ff4-a958-481fc665075a" xlink:to="loc_us-gaap_CreditFacilityAxis_fb05ae1d-ad51-47fc-b537-657348b7a3c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_fb05ae1d-ad51-47fc-b537-657348b7a3c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_fb05ae1d-ad51-47fc-b537-657348b7a3c0" xlink:to="loc_us-gaap_CreditFacilityDomain_fb05ae1d-ad51-47fc-b537-657348b7a3c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_ae64afc3-7fc4-4404-88e3-1f348ffe5795" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_fb05ae1d-ad51-47fc-b537-657348b7a3c0" xlink:to="loc_us-gaap_CreditFacilityDomain_ae64afc3-7fc4-4404-88e3-1f348ffe5795" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_WarehouseCreditFacilityMember_e4a739f5-c8c1-4b9a-8617-e453926b4cc2" xlink:href="afrm-20250630.xsd#afrm_WarehouseCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ae64afc3-7fc4-4404-88e3-1f348ffe5795" xlink:to="loc_afrm_WarehouseCreditFacilityMember_e4a739f5-c8c1-4b9a-8617-e453926b4cc2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SecuritizationMember_a3082b90-7751-43f3-95f0-6475f1d41fdd" xlink:href="afrm-20250630.xsd#afrm_SecuritizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ae64afc3-7fc4-4404-88e3-1f348ffe5795" xlink:to="loc_afrm_SecuritizationMember_a3082b90-7751-43f3-95f0-6475f1d41fdd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_NotesIssuedBySecuritizationTrustsMember_8197ee0d-dfce-42b7-9258-a2062db3e916" xlink:href="afrm-20250630.xsd#afrm_NotesIssuedBySecuritizationTrustsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ae64afc3-7fc4-4404-88e3-1f348ffe5795" xlink:to="loc_afrm_NotesIssuedBySecuritizationTrustsMember_8197ee0d-dfce-42b7-9258-a2062db3e916" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_1476b577-4a9d-4574-9d3e-86808d978315" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_bc6a3303-d5a9-4ff4-a958-481fc665075a" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_1476b577-4a9d-4574-9d3e-86808d978315" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_1476b577-4a9d-4574-9d3e-86808d978315_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_1476b577-4a9d-4574-9d3e-86808d978315" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_1476b577-4a9d-4574-9d3e-86808d978315_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_3ab97d4f-7e1c-4173-9eeb-eee933f20c69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_1476b577-4a9d-4574-9d3e-86808d978315" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_3ab97d4f-7e1c-4173-9eeb-eee933f20c69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FundingDebtMember_50b3b12c-8229-4656-9760-cbaad6754404" xlink:href="afrm-20250630.xsd#afrm_FundingDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_3ab97d4f-7e1c-4173-9eeb-eee933f20c69" xlink:to="loc_afrm_FundingDebtMember_50b3b12c-8229-4656-9760-cbaad6754404" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableOtherPayablesMember_46906c34-51a9-4d03-96d5-fd46408943e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesPayableOtherPayablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_3ab97d4f-7e1c-4173-9eeb-eee933f20c69" xlink:to="loc_us-gaap_NotesPayableOtherPayablesMember_46906c34-51a9-4d03-96d5-fd46408943e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_21a0736a-ef75-4599-bc5b-5156464db9d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2c4250f1-232a-49f7-8690-71bc4a515c31" xlink:to="loc_us-gaap_Assets_21a0736a-ef75-4599-bc5b-5156464db9d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_2d2668e8-d07f-4b9f-bbd0-ea419778e17d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2c4250f1-232a-49f7-8690-71bc4a515c31" xlink:to="loc_us-gaap_Liabilities_2d2668e8-d07f-4b9f-bbd0-ea419778e17d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNet_9fa26519-b9e9-4b53-8f6b-64051bb7aa66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2c4250f1-232a-49f7-8690-71bc4a515c31" xlink:to="loc_us-gaap_AssetsNet_9fa26519-b9e9-4b53-8f6b-64051bb7aa66" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/SecuritizationsandVariableInterestEntitiesScheduleofVariableInterestEntitiesDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#SecuritizationsandVariableInterestEntitiesScheduleofVariableInterestEntitiesDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/SecuritizationsandVariableInterestEntitiesScheduleofVariableInterestEntitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_f2e15d15-8264-430e-a2a2-e8535454c5e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_afc26356-5d31-48f2-9274-89c5c791a680" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f2e15d15-8264-430e-a2a2-e8535454c5e8" xlink:to="loc_us-gaap_DebtInstrumentTable_afc26356-5d31-48f2-9274-89c5c791a680" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_d05b803e-01d2-438e-866b-b322742b464a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_afc26356-5d31-48f2-9274-89c5c791a680" xlink:to="loc_srt_ConsolidatedEntitiesAxis_d05b803e-01d2-438e-866b-b322742b464a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_d05b803e-01d2-438e-866b-b322742b464a_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_d05b803e-01d2-438e-866b-b322742b464a" xlink:to="loc_srt_ConsolidatedEntitiesDomain_d05b803e-01d2-438e-866b-b322742b464a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_72942cf9-7075-44f2-a87e-87e6c478bee5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_d05b803e-01d2-438e-866b-b322742b464a" xlink:to="loc_srt_ConsolidatedEntitiesDomain_72942cf9-7075-44f2-a87e-87e6c478bee5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_1a5717c5-7e4c-4afc-b649-cc58220a0fe6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_72942cf9-7075-44f2-a87e-87e6c478bee5" xlink:to="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_1a5717c5-7e4c-4afc-b649-cc58220a0fe6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_bf62db48-767c-4635-bf2c-44ad488bc46e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_afc26356-5d31-48f2-9274-89c5c791a680" xlink:to="loc_us-gaap_CreditFacilityAxis_bf62db48-767c-4635-bf2c-44ad488bc46e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_bf62db48-767c-4635-bf2c-44ad488bc46e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_bf62db48-767c-4635-bf2c-44ad488bc46e" xlink:to="loc_us-gaap_CreditFacilityDomain_bf62db48-767c-4635-bf2c-44ad488bc46e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_24f4c656-6675-44e6-a76f-0ca0b961ef6d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_bf62db48-767c-4635-bf2c-44ad488bc46e" xlink:to="loc_us-gaap_CreditFacilityDomain_24f4c656-6675-44e6-a76f-0ca0b961ef6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SecuritizationMember_dd4c1a93-d446-4315-9b3f-73422c79dcfb" xlink:href="afrm-20250630.xsd#afrm_SecuritizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_24f4c656-6675-44e6-a76f-0ca0b961ef6d" xlink:to="loc_afrm_SecuritizationMember_dd4c1a93-d446-4315-9b3f-73422c79dcfb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ResidualInterestsInStructuredTransactionsMember_72cf4dcd-e47e-4d3d-8912-b6c3598aec58" xlink:href="afrm-20250630.xsd#afrm_ResidualInterestsInStructuredTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_24f4c656-6675-44e6-a76f-0ca0b961ef6d" xlink:to="loc_afrm_ResidualInterestsInStructuredTransactionsMember_72cf4dcd-e47e-4d3d-8912-b6c3598aec58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RiskSharingAssetsMember_679f3acd-3d04-4371-82fe-578fc84bb607" xlink:href="afrm-20250630.xsd#afrm_RiskSharingAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_24f4c656-6675-44e6-a76f-0ca0b961ef6d" xlink:to="loc_afrm_RiskSharingAssetsMember_679f3acd-3d04-4371-82fe-578fc84bb607" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RiskSharingLiabilitiesMember_b53bc7b9-738d-4e03-9163-aabe0c228d55" xlink:href="afrm-20250630.xsd#afrm_RiskSharingLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_24f4c656-6675-44e6-a76f-0ca0b961ef6d" xlink:to="loc_afrm_RiskSharingLiabilitiesMember_b53bc7b9-738d-4e03-9163-aabe0c228d55" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_d1227117-1477-47d7-a819-4901e492ecb9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f2e15d15-8264-430e-a2a2-e8535454c5e8" xlink:to="loc_us-gaap_Assets_d1227117-1477-47d7-a819-4901e492ecb9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_123fd8be-4d6b-4575-9f82-b5447fb412b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f2e15d15-8264-430e-a2a2-e8535454c5e8" xlink:to="loc_us-gaap_Liabilities_123fd8be-4d6b-4575-9f82-b5447fb412b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNet_03c480a1-5946-48ec-bb50-abe2e1da858e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f2e15d15-8264-430e-a2a2-e8535454c5e8" xlink:to="loc_us-gaap_AssetsNet_03c480a1-5946-48ec-bb50-abe2e1da858e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_c509b7b6-fdb7-43f1-b81f-cb51b6eadbed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f2e15d15-8264-430e-a2a2-e8535454c5e8" xlink:to="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_c509b7b6-fdb7-43f1-b81f-cb51b6eadbed" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/InvestmentsScheduleofCashandCashEquivalentsandSecuritiesAvailableforSaleDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#InvestmentsScheduleofCashandCashEquivalentsandSecuritiesAvailableforSaleDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/InvestmentsScheduleofCashandCashEquivalentsandSecuritiesAvailableforSaleDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketableSecuritiesLineItems_85e0d5d4-da03-4b14-acbc-715b7ccaaf91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketableSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketableSecuritiesTable_ca932bfa-f9b0-478e-87d6-85cce3ea5a5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketableSecuritiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MarketableSecuritiesLineItems_85e0d5d4-da03-4b14-acbc-715b7ccaaf91" xlink:to="loc_us-gaap_MarketableSecuritiesTable_ca932bfa-f9b0-478e-87d6-85cce3ea5a5b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_80f2fdc7-064e-4999-b265-928d1014531e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketableSecuritiesTable_ca932bfa-f9b0-478e-87d6-85cce3ea5a5b" xlink:to="loc_us-gaap_FinancialInstrumentAxis_80f2fdc7-064e-4999-b265-928d1014531e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_80f2fdc7-064e-4999-b265-928d1014531e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_80f2fdc7-064e-4999-b265-928d1014531e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_80f2fdc7-064e-4999-b265-928d1014531e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_2ab5372c-e710-4455-88c8-b4b865c0f4f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_80f2fdc7-064e-4999-b265-928d1014531e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_2ab5372c-e710-4455-88c8-b4b865c0f4f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_8b71f2ba-ab73-4c29-b086-d9a26432f2a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_2ab5372c-e710-4455-88c8-b4b865c0f4f6" xlink:to="loc_us-gaap_MoneyMarketFundsMember_8b71f2ba-ab73-4c29-b086-d9a26432f2a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AgencySecuritiesMember_1b9323d5-0fea-4c26-b0f5-04bd5c5ea9a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AgencySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_2ab5372c-e710-4455-88c8-b4b865c0f4f6" xlink:to="loc_us-gaap_AgencySecuritiesMember_1b9323d5-0fea-4c26-b0f5-04bd5c5ea9a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaperMember_2edea99f-5db5-4297-8351-01daa181660d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPaperMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_2ab5372c-e710-4455-88c8-b4b865c0f4f6" xlink:to="loc_us-gaap_CommercialPaperMember_2edea99f-5db5-4297-8351-01daa181660d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_79d52056-bd39-4e52-88d4-2f59b7e63ffc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_2ab5372c-e710-4455-88c8-b4b865c0f4f6" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_79d52056-bd39-4e52-88d4-2f59b7e63ffc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertificatesOfDepositMember_95d36b5f-c05b-4f5a-b492-f6bbc3ae863b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CertificatesOfDepositMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_2ab5372c-e710-4455-88c8-b4b865c0f4f6" xlink:to="loc_us-gaap_CertificatesOfDepositMember_95d36b5f-c05b-4f5a-b492-f6bbc3ae863b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateBondSecuritiesMember_da0c9a47-f1b8-49f0-bb0f-9f2e8e5558e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateBondSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_2ab5372c-e710-4455-88c8-b4b865c0f4f6" xlink:to="loc_us-gaap_CorporateBondSecuritiesMember_da0c9a47-f1b8-49f0-bb0f-9f2e8e5558e3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_2ee82615-47fe-473e-8d1f-79d40aab36bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_2ab5372c-e710-4455-88c8-b4b865c0f4f6" xlink:to="loc_us-gaap_MunicipalBondsMember_2ee82615-47fe-473e-8d1f-79d40aab36bf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_NonUSGovernmentAgenciesDebtSecuritiesMember_fb234c06-da4e-413c-a286-435a9090b9e9" xlink:href="afrm-20250630.xsd#afrm_NonUSGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_2ab5372c-e710-4455-88c8-b4b865c0f4f6" xlink:to="loc_afrm_NonUSGovernmentAgenciesDebtSecuritiesMember_fb234c06-da4e-413c-a286-435a9090b9e9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SecuritizationNotesReceivableAndCertificatesMember_a49b004b-21c6-4797-84e0-59567c7b0a08" xlink:href="afrm-20250630.xsd#afrm_SecuritizationNotesReceivableAndCertificatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_2ab5372c-e710-4455-88c8-b4b865c0f4f6" xlink:to="loc_afrm_SecuritizationNotesReceivableAndCertificatesMember_a49b004b-21c6-4797-84e0-59567c7b0a08" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ResidualInterestsInStructuredTransactionsMember_eabd622e-d0f2-482e-b121-5e7657281130" xlink:href="afrm-20250630.xsd#afrm_ResidualInterestsInStructuredTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_2ab5372c-e710-4455-88c8-b4b865c0f4f6" xlink:to="loc_afrm_ResidualInterestsInStructuredTransactionsMember_eabd622e-d0f2-482e-b121-5e7657281130" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_577e3e84-7a94-4cbe-935b-2d76fccbf8b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketableSecuritiesTable_ca932bfa-f9b0-478e-87d6-85cce3ea5a5b" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_577e3e84-7a94-4cbe-935b-2d76fccbf8b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_577e3e84-7a94-4cbe-935b-2d76fccbf8b8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_577e3e84-7a94-4cbe-935b-2d76fccbf8b8" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_577e3e84-7a94-4cbe-935b-2d76fccbf8b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_60f4632b-9895-4cd3-8b37-5d6352dbf54b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_577e3e84-7a94-4cbe-935b-2d76fccbf8b8" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_60f4632b-9895-4cd3-8b37-5d6352dbf54b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashEquivalentsMember_9e0e7620-3019-40da-95e1-f56611b8f8ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_60f4632b-9895-4cd3-8b37-5d6352dbf54b" xlink:to="loc_us-gaap_CashEquivalentsMember_9e0e7620-3019-40da-95e1-f56611b8f8ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusAxis_6499e7f7-16fa-4c53-b1ba-d9f60a2e7e8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketableSecuritiesTable_ca932bfa-f9b0-478e-87d6-85cce3ea5a5b" xlink:to="loc_us-gaap_PledgedStatusAxis_6499e7f7-16fa-4c53-b1ba-d9f60a2e7e8d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_6499e7f7-16fa-4c53-b1ba-d9f60a2e7e8d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PledgedStatusAxis_6499e7f7-16fa-4c53-b1ba-d9f60a2e7e8d" xlink:to="loc_us-gaap_PledgedStatusDomain_6499e7f7-16fa-4c53-b1ba-d9f60a2e7e8d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_71c6546d-dbb1-479b-a2b1-9c8f8f4cbe26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PledgedStatusAxis_6499e7f7-16fa-4c53-b1ba-d9f60a2e7e8d" xlink:to="loc_us-gaap_PledgedStatusDomain_71c6546d-dbb1-479b-a2b1-9c8f8f4cbe26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetPledgedAsCollateralMember_06ec2023-4216-403b-9835-a72697414a65" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetPledgedAsCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PledgedStatusDomain_71c6546d-dbb1-479b-a2b1-9c8f8f4cbe26" xlink:to="loc_us-gaap_AssetPledgedAsCollateralMember_06ec2023-4216-403b-9835-a72697414a65" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketableSecurities_618936ec-ad7d-4c06-9a96-6d24dd35148d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketableSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketableSecuritiesLineItems_85e0d5d4-da03-4b14-acbc-715b7ccaaf91" xlink:to="loc_us-gaap_MarketableSecurities_618936ec-ad7d-4c06-9a96-6d24dd35148d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/InvestmentsScheduleofSecuritiesAvailableforSaleDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#InvestmentsScheduleofSecuritiesAvailableforSaleDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/InvestmentsScheduleofSecuritiesAvailableforSaleDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_adb109c9-6b35-4fdd-b189-25a208405ae6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_ce83e336-2ed3-45c2-a477-602e691fe3ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_adb109c9-6b35-4fdd-b189-25a208405ae6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_ce83e336-2ed3-45c2-a477-602e691fe3ef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_ba08da13-f6e7-4a05-b10d-14831bb1ac8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_ce83e336-2ed3-45c2-a477-602e691fe3ef" xlink:to="loc_us-gaap_FinancialInstrumentAxis_ba08da13-f6e7-4a05-b10d-14831bb1ac8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ba08da13-f6e7-4a05-b10d-14831bb1ac8c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_ba08da13-f6e7-4a05-b10d-14831bb1ac8c" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ba08da13-f6e7-4a05-b10d-14831bb1ac8c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_b8976bb4-962f-49a3-aef0-af25a6f7da39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_ba08da13-f6e7-4a05-b10d-14831bb1ac8c" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_b8976bb4-962f-49a3-aef0-af25a6f7da39" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertificatesOfDepositMember_388b5bd3-c7e4-4117-9721-3ac5ce1d1925" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CertificatesOfDepositMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_b8976bb4-962f-49a3-aef0-af25a6f7da39" xlink:to="loc_us-gaap_CertificatesOfDepositMember_388b5bd3-c7e4-4117-9721-3ac5ce1d1925" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateBondSecuritiesMember_c51ea786-d5e2-422b-a3e9-08726a7e2f2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateBondSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_b8976bb4-962f-49a3-aef0-af25a6f7da39" xlink:to="loc_us-gaap_CorporateBondSecuritiesMember_c51ea786-d5e2-422b-a3e9-08726a7e2f2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaperMember_daaf0138-3ac1-4a5c-90d6-f842e47c0f17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPaperMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_b8976bb4-962f-49a3-aef0-af25a6f7da39" xlink:to="loc_us-gaap_CommercialPaperMember_daaf0138-3ac1-4a5c-90d6-f842e47c0f17" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AgencySecuritiesMember_0201a971-76e2-4158-ad73-3ec5e0f4b2f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AgencySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_b8976bb4-962f-49a3-aef0-af25a6f7da39" xlink:to="loc_us-gaap_AgencySecuritiesMember_0201a971-76e2-4158-ad73-3ec5e0f4b2f5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_cc28ed67-fe4b-4813-8061-def0f0bd4d59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_b8976bb4-962f-49a3-aef0-af25a6f7da39" xlink:to="loc_us-gaap_MunicipalBondsMember_cc28ed67-fe4b-4813-8061-def0f0bd4d59" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_NonUSGovernmentAgenciesDebtSecuritiesMember_aa516978-0a53-4140-9114-da7fa919cfb2" xlink:href="afrm-20250630.xsd#afrm_NonUSGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_b8976bb4-962f-49a3-aef0-af25a6f7da39" xlink:to="loc_afrm_NonUSGovernmentAgenciesDebtSecuritiesMember_aa516978-0a53-4140-9114-da7fa919cfb2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_d32fcf84-4828-4bf9-a628-7fb3f885f3ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_b8976bb4-962f-49a3-aef0-af25a6f7da39" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_d32fcf84-4828-4bf9-a628-7fb3f885f3ed" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SecuritizationNotesReceivableAndCertificatesMember_c2189fe1-1bef-430e-8ff8-60294b775e9a" xlink:href="afrm-20250630.xsd#afrm_SecuritizationNotesReceivableAndCertificatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_b8976bb4-962f-49a3-aef0-af25a6f7da39" xlink:to="loc_afrm_SecuritizationNotesReceivableAndCertificatesMember_c2189fe1-1bef-430e-8ff8-60294b775e9a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_AgencyBondsCommercialPaperAndUSGovernmentBondsMember_6f4f727a-b0de-4289-8e6d-b09ce7661d15" xlink:href="afrm-20250630.xsd#afrm_AgencyBondsCommercialPaperAndUSGovernmentBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_b8976bb4-962f-49a3-aef0-af25a6f7da39" xlink:to="loc_afrm_AgencyBondsCommercialPaperAndUSGovernmentBondsMember_6f4f727a-b0de-4289-8e6d-b09ce7661d15" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ResidualInterestsInStructuredTransactionsMember_3796adb4-86ba-4a09-b24d-638369d964c9" xlink:href="afrm-20250630.xsd#afrm_ResidualInterestsInStructuredTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_b8976bb4-962f-49a3-aef0-af25a6f7da39" xlink:to="loc_afrm_ResidualInterestsInStructuredTransactionsMember_3796adb4-86ba-4a09-b24d-638369d964c9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_42938190-3157-4a44-bbf5-b217dce62407" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_ce83e336-2ed3-45c2-a477-602e691fe3ef" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_42938190-3157-4a44-bbf5-b217dce62407" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_42938190-3157-4a44-bbf5-b217dce62407_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_42938190-3157-4a44-bbf5-b217dce62407" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_42938190-3157-4a44-bbf5-b217dce62407_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_ada8e631-f70b-4734-be7b-d4dd7e0b3953" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_42938190-3157-4a44-bbf5-b217dce62407" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_ada8e631-f70b-4734-be7b-d4dd7e0b3953" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashEquivalentsMember_2cf0b704-5ab3-49a8-993b-593aed60c66c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_ada8e631-f70b-4734-be7b-d4dd7e0b3953" xlink:to="loc_us-gaap_CashEquivalentsMember_2cf0b704-5ab3-49a8-993b-593aed60c66c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_OtherReceivablesMember_de4e36f6-bb8f-4c83-9803-1faebafe9994" xlink:href="afrm-20250630.xsd#afrm_OtherReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_ada8e631-f70b-4734-be7b-d4dd7e0b3953" xlink:to="loc_afrm_OtherReceivablesMember_de4e36f6-bb8f-4c83-9803-1faebafe9994" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusAxis_da18b3a5-4376-483b-8336-7a0f47407336" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_ce83e336-2ed3-45c2-a477-602e691fe3ef" xlink:to="loc_us-gaap_PledgedStatusAxis_da18b3a5-4376-483b-8336-7a0f47407336" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_da18b3a5-4376-483b-8336-7a0f47407336_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PledgedStatusAxis_da18b3a5-4376-483b-8336-7a0f47407336" xlink:to="loc_us-gaap_PledgedStatusDomain_da18b3a5-4376-483b-8336-7a0f47407336_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_ba744f7d-bbc7-4d76-8944-3409bb1f4058" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PledgedStatusAxis_da18b3a5-4376-483b-8336-7a0f47407336" xlink:to="loc_us-gaap_PledgedStatusDomain_ba744f7d-bbc7-4d76-8944-3409bb1f4058" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetPledgedAsCollateralMember_03e06360-25dd-4aff-983d-79fe36845773" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetPledgedAsCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PledgedStatusDomain_ba744f7d-bbc7-4d76-8944-3409bb1f4058" xlink:to="loc_us-gaap_AssetPledgedAsCollateralMember_03e06360-25dd-4aff-983d-79fe36845773" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_602524c8-b523-4e9a-9fe8-67e2eacd8c39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_ce83e336-2ed3-45c2-a477-602e691fe3ef" xlink:to="loc_us-gaap_DebtInstrumentAxis_602524c8-b523-4e9a-9fe8-67e2eacd8c39" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_602524c8-b523-4e9a-9fe8-67e2eacd8c39_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_602524c8-b523-4e9a-9fe8-67e2eacd8c39" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_602524c8-b523-4e9a-9fe8-67e2eacd8c39_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_8e9e6885-bc6f-499a-a65d-2f1238b9122c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_602524c8-b523-4e9a-9fe8-67e2eacd8c39" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_8e9e6885-bc6f-499a-a65d-2f1238b9122c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_AffirmAssetSecuritizationTrust2021Z1And2021Z2NotesMember_cfa3e8b2-abb3-4f35-a181-0cca00d27cd4" xlink:href="afrm-20250630.xsd#afrm_AffirmAssetSecuritizationTrust2021Z1And2021Z2NotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_8e9e6885-bc6f-499a-a65d-2f1238b9122c" xlink:to="loc_afrm_AffirmAssetSecuritizationTrust2021Z1And2021Z2NotesMember_cfa3e8b2-abb3-4f35-a181-0cca00d27cd4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_86e0f52f-aebd-40c2-b4eb-227865e6d1b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_ce83e336-2ed3-45c2-a477-602e691fe3ef" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_86e0f52f-aebd-40c2-b4eb-227865e6d1b0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_86e0f52f-aebd-40c2-b4eb-227865e6d1b0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_86e0f52f-aebd-40c2-b4eb-227865e6d1b0" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_86e0f52f-aebd-40c2-b4eb-227865e6d1b0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_51f18635-1f99-4f10-9d9b-afe4e1626f6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_86e0f52f-aebd-40c2-b4eb-227865e6d1b0" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_51f18635-1f99-4f10-9d9b-afe4e1626f6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RepurchaseAgreementMember_af613307-a0bd-424f-9bc3-b2290c0ef645" xlink:href="afrm-20250630.xsd#afrm_RepurchaseAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_51f18635-1f99-4f10-9d9b-afe4e1626f6e" xlink:to="loc_afrm_RepurchaseAgreementMember_af613307-a0bd-424f-9bc3-b2290c0ef645" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss_4649d667-24ac-4c42-9b7d-1742a7f23c3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_adb109c9-6b35-4fdd-b189-25a208405ae6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss_4649d667-24ac-4c42-9b7d-1742a7f23c3f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_855a8682-2ac4-4d98-aa6a-8648886108ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_adb109c9-6b35-4fdd-b189-25a208405ae6" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_855a8682-2ac4-4d98-aa6a-8648886108ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_782debec-d392-40e1-81d7-fee48fe31c48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_adb109c9-6b35-4fdd-b189-25a208405ae6" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_782debec-d392-40e1-81d7-fee48fe31c48" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_f949cd26-6a40-42c1-b414-2b1e8e0e0eab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_adb109c9-6b35-4fdd-b189-25a208405ae6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_f949cd26-6a40-42c1-b414-2b1e8e0e0eab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_fb4c8928-53c0-4323-b542-5df01bcc07ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_adb109c9-6b35-4fdd-b189-25a208405ae6" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_fb4c8928-53c0-4323-b542-5df01bcc07ef" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/InvestmentsScheduleofAvailableforsaleSecuritieswithUnrealizedLossesDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#InvestmentsScheduleofAvailableforsaleSecuritieswithUnrealizedLossesDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/InvestmentsScheduleofAvailableforsaleSecuritieswithUnrealizedLossesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d34ab159-12a0-4810-93c6-42168a292e77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_771738c8-f90a-4a62-bd08-c1c2e790b1d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d34ab159-12a0-4810-93c6-42168a292e77" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_771738c8-f90a-4a62-bd08-c1c2e790b1d3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_c01c1040-2889-400e-9c29-5dd2a48894c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_771738c8-f90a-4a62-bd08-c1c2e790b1d3" xlink:to="loc_us-gaap_FinancialInstrumentAxis_c01c1040-2889-400e-9c29-5dd2a48894c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_c01c1040-2889-400e-9c29-5dd2a48894c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_c01c1040-2889-400e-9c29-5dd2a48894c0" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_c01c1040-2889-400e-9c29-5dd2a48894c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b24644a-affd-422e-8a48-734e4a8edfdd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_c01c1040-2889-400e-9c29-5dd2a48894c0" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b24644a-affd-422e-8a48-734e4a8edfdd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertificatesOfDepositMember_c36dcfa2-d490-432c-906e-3d2bf296a847" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CertificatesOfDepositMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b24644a-affd-422e-8a48-734e4a8edfdd" xlink:to="loc_us-gaap_CertificatesOfDepositMember_c36dcfa2-d490-432c-906e-3d2bf296a847" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateBondSecuritiesMember_0d07801b-40e7-478c-88de-c69625d5d67c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateBondSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b24644a-affd-422e-8a48-734e4a8edfdd" xlink:to="loc_us-gaap_CorporateBondSecuritiesMember_0d07801b-40e7-478c-88de-c69625d5d67c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaperMember_e658bfbc-5496-45c5-8406-34e07cabde0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPaperMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b24644a-affd-422e-8a48-734e4a8edfdd" xlink:to="loc_us-gaap_CommercialPaperMember_e658bfbc-5496-45c5-8406-34e07cabde0a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AgencySecuritiesMember_14b4a72b-fd43-4a95-ba1b-9a765c31a551" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AgencySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b24644a-affd-422e-8a48-734e4a8edfdd" xlink:to="loc_us-gaap_AgencySecuritiesMember_14b4a72b-fd43-4a95-ba1b-9a765c31a551" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_NonUSGovernmentAgenciesDebtSecuritiesMember_2cd2cd8b-238f-4594-b7ee-30fa0fb15bcc" xlink:href="afrm-20250630.xsd#afrm_NonUSGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b24644a-affd-422e-8a48-734e4a8edfdd" xlink:to="loc_afrm_NonUSGovernmentAgenciesDebtSecuritiesMember_2cd2cd8b-238f-4594-b7ee-30fa0fb15bcc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_f0293e47-0498-455e-993f-d8603b9bcb82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b24644a-affd-422e-8a48-734e4a8edfdd" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_f0293e47-0498-455e-993f-d8603b9bcb82" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_c720f06c-d550-47de-a870-9be189ca2940" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d34ab159-12a0-4810-93c6-42168a292e77" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_c720f06c-d550-47de-a870-9be189ca2940" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_c80a55ef-7f5b-4a36-94e3-38be8294e069" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d34ab159-12a0-4810-93c6-42168a292e77" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_c80a55ef-7f5b-4a36-94e3-38be8294e069" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_0ee165b8-d5af-4ff9-8eef-98f37753312f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d34ab159-12a0-4810-93c6-42168a292e77" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_0ee165b8-d5af-4ff9-8eef-98f37753312f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_0fa0497e-dae4-4caf-98f3-c13fe07eb401" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d34ab159-12a0-4810-93c6-42168a292e77" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_0fa0497e-dae4-4caf-98f3-c13fe07eb401" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_1f2babbc-9856-4a9e-93ec-294d1cc5d9a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d34ab159-12a0-4810-93c6-42168a292e77" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_1f2babbc-9856-4a9e-93ec-294d1cc5d9a2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_c423fdcd-2720-455c-821e-796d9107abf4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d34ab159-12a0-4810-93c6-42168a292e77" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_c423fdcd-2720-455c-821e-796d9107abf4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions_db3caa76-fac5-4864-9f1f-80fe7e179e8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d34ab159-12a0-4810-93c6-42168a292e77" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions_db3caa76-fac5-4864-9f1f-80fe7e179e8a" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/InvestmentsScheduleofLengthofContractualMaturitiesofSecuritiesAvailableforSaleDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#InvestmentsScheduleofLengthofContractualMaturitiesofSecuritiesAvailableforSaleDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/InvestmentsScheduleofLengthofContractualMaturitiesofSecuritiesAvailableforSaleDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_75852931-f85c-4b0f-917f-6d29c2768087" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_18a74726-7188-4ca9-929d-baa9cbc0b4a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_75852931-f85c-4b0f-917f-6d29c2768087" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_18a74726-7188-4ca9-929d-baa9cbc0b4a8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_12557684-c0c4-4b75-8bc1-1283d94ea226" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_18a74726-7188-4ca9-929d-baa9cbc0b4a8" xlink:to="loc_us-gaap_FinancialInstrumentAxis_12557684-c0c4-4b75-8bc1-1283d94ea226" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_12557684-c0c4-4b75-8bc1-1283d94ea226_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_12557684-c0c4-4b75-8bc1-1283d94ea226" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_12557684-c0c4-4b75-8bc1-1283d94ea226_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_773073a3-0dcc-4fc2-8be6-34db176ded3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_12557684-c0c4-4b75-8bc1-1283d94ea226" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_773073a3-0dcc-4fc2-8be6-34db176ded3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertificatesOfDepositMember_086e4f11-c72a-4710-9ae4-c634a8f624a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CertificatesOfDepositMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_773073a3-0dcc-4fc2-8be6-34db176ded3f" xlink:to="loc_us-gaap_CertificatesOfDepositMember_086e4f11-c72a-4710-9ae4-c634a8f624a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateBondSecuritiesMember_5e8cd227-57ec-4297-9e39-6dfbd546f690" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateBondSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_773073a3-0dcc-4fc2-8be6-34db176ded3f" xlink:to="loc_us-gaap_CorporateBondSecuritiesMember_5e8cd227-57ec-4297-9e39-6dfbd546f690" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaperMember_1965bbbd-b6d9-4828-8b00-9602cc100df2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPaperMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_773073a3-0dcc-4fc2-8be6-34db176ded3f" xlink:to="loc_us-gaap_CommercialPaperMember_1965bbbd-b6d9-4828-8b00-9602cc100df2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AgencySecuritiesMember_b8243779-1099-470e-aff9-4f908545a6b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AgencySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_773073a3-0dcc-4fc2-8be6-34db176ded3f" xlink:to="loc_us-gaap_AgencySecuritiesMember_b8243779-1099-470e-aff9-4f908545a6b3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_8fe80a48-57d4-47e5-a6fe-5081a6ffdf56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_773073a3-0dcc-4fc2-8be6-34db176ded3f" xlink:to="loc_us-gaap_MunicipalBondsMember_8fe80a48-57d4-47e5-a6fe-5081a6ffdf56" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_NonUSGovernmentAgenciesDebtSecuritiesMember_702a1c56-cbcb-49ef-ba56-05ec99521e8c" xlink:href="afrm-20250630.xsd#afrm_NonUSGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_773073a3-0dcc-4fc2-8be6-34db176ded3f" xlink:to="loc_afrm_NonUSGovernmentAgenciesDebtSecuritiesMember_702a1c56-cbcb-49ef-ba56-05ec99521e8c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_56fdc12d-0b0d-44bb-b1f8-cb9f09a1185a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_773073a3-0dcc-4fc2-8be6-34db176ded3f" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_56fdc12d-0b0d-44bb-b1f8-cb9f09a1185a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SecuritizationNotesReceivableAndCertificatesMember_ba6c37bd-c435-4779-829f-6e6b3d6d2ef5" xlink:href="afrm-20250630.xsd#afrm_SecuritizationNotesReceivableAndCertificatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_773073a3-0dcc-4fc2-8be6-34db176ded3f" xlink:to="loc_afrm_SecuritizationNotesReceivableAndCertificatesMember_ba6c37bd-c435-4779-829f-6e6b3d6d2ef5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ResidualInterestsInStructuredTransactionsMember_e63e5c94-5d39-483e-9e73-d142b45c2a0b" xlink:href="afrm-20250630.xsd#afrm_ResidualInterestsInStructuredTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_773073a3-0dcc-4fc2-8be6-34db176ded3f" xlink:to="loc_afrm_ResidualInterestsInStructuredTransactionsMember_e63e5c94-5d39-483e-9e73-d142b45c2a0b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_AgencyBondsCommercialPaperAndUSGovernmentBondsMember_3da99d45-9938-4a27-bfb9-6e486340214e" xlink:href="afrm-20250630.xsd#afrm_AgencyBondsCommercialPaperAndUSGovernmentBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_773073a3-0dcc-4fc2-8be6-34db176ded3f" xlink:to="loc_afrm_AgencyBondsCommercialPaperAndUSGovernmentBondsMember_3da99d45-9938-4a27-bfb9-6e486340214e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_1884219b-60d5-4e0a-b6ae-dedc62f2024f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_18a74726-7188-4ca9-929d-baa9cbc0b4a8" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_1884219b-60d5-4e0a-b6ae-dedc62f2024f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_1884219b-60d5-4e0a-b6ae-dedc62f2024f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_1884219b-60d5-4e0a-b6ae-dedc62f2024f" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_1884219b-60d5-4e0a-b6ae-dedc62f2024f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_adbe7b63-8834-4a5f-9eeb-e8bacb92b4b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_1884219b-60d5-4e0a-b6ae-dedc62f2024f" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_adbe7b63-8834-4a5f-9eeb-e8bacb92b4b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashEquivalentsMember_86a3a30f-62ad-4b50-af61-a34a6ba1310a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_adbe7b63-8834-4a5f-9eeb-e8bacb92b4b3" xlink:to="loc_us-gaap_CashEquivalentsMember_86a3a30f-62ad-4b50-af61-a34a6ba1310a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis_7356c693-f5ac-4c8b-964f-d732b60f2af9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_75852931-f85c-4b0f-917f-6d29c2768087" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis_7356c693-f5ac-4c8b-964f-d732b60f2af9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue_7639b49d-8af6-4639-83c5-bd746ada5555" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_75852931-f85c-4b0f-917f-6d29c2768087" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue_7639b49d-8af6-4639-83c5-bd746ada5555" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis_93aca3c8-c2c7-431b-967e-a01a8b315ee4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_75852931-f85c-4b0f-917f-6d29c2768087" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis_93aca3c8-c2c7-431b-967e-a01a8b315ee4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_1a5084c8-870c-4f8a-adb6-ddfceaa2ba9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_75852931-f85c-4b0f-917f-6d29c2768087" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_1a5084c8-870c-4f8a-adb6-ddfceaa2ba9c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss_2d978d33-6ba5-45ca-b06d-c7650179669b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_75852931-f85c-4b0f-917f-6d29c2768087" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss_2d978d33-6ba5-45ca-b06d-c7650179669b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_4b83260b-9c27-450b-9abe-9f6e1bcf3408" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_75852931-f85c-4b0f-917f-6d29c2768087" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_4b83260b-9c27-450b-9abe-9f6e1bcf3408" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/DerivativeFinancialInstrumentsScheduleofFairValueofDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#DerivativeFinancialInstrumentsScheduleofFairValueofDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/DerivativeFinancialInstrumentsScheduleofFairValueofDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_7d168603-dcd9-4026-8603-fef37f4eac06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_0e078f5d-596b-41d4-8fd5-9658d51b5bc8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_7d168603-dcd9-4026-8603-fef37f4eac06" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_0e078f5d-596b-41d4-8fd5-9658d51b5bc8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_cbe764b5-723b-407f-8ccf-fd8d27a01c27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_0e078f5d-596b-41d4-8fd5-9658d51b5bc8" xlink:to="loc_us-gaap_HedgingDesignationAxis_cbe764b5-723b-407f-8ccf-fd8d27a01c27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_cbe764b5-723b-407f-8ccf-fd8d27a01c27_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_cbe764b5-723b-407f-8ccf-fd8d27a01c27" xlink:to="loc_us-gaap_HedgingDesignationDomain_cbe764b5-723b-407f-8ccf-fd8d27a01c27_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_6d0d84d3-47e8-4e1c-a8e3-7980e090910e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_cbe764b5-723b-407f-8ccf-fd8d27a01c27" xlink:to="loc_us-gaap_HedgingDesignationDomain_6d0d84d3-47e8-4e1c-a8e3-7980e090910e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_68f8b5b8-301a-420f-a5d4-e8d69363737d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_6d0d84d3-47e8-4e1c-a8e3-7980e090910e" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_68f8b5b8-301a-420f-a5d4-e8d69363737d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_e5818ece-464a-4c1d-9c60-28534ca9e5fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_6d0d84d3-47e8-4e1c-a8e3-7980e090910e" xlink:to="loc_us-gaap_NondesignatedMember_e5818ece-464a-4c1d-9c60-28534ca9e5fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_04ccfd04-b4c8-4820-91a1-25ceb1208880" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_0e078f5d-596b-41d4-8fd5-9658d51b5bc8" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_04ccfd04-b4c8-4820-91a1-25ceb1208880" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_04ccfd04-b4c8-4820-91a1-25ceb1208880_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_04ccfd04-b4c8-4820-91a1-25ceb1208880" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_04ccfd04-b4c8-4820-91a1-25ceb1208880_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_a353a843-6f01-40a5-a1df-93c525242f66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_04ccfd04-b4c8-4820-91a1-25ceb1208880" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_a353a843-6f01-40a5-a1df-93c525242f66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_bd10dab2-6337-4f67-820f-889364e67833" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_a353a843-6f01-40a5-a1df-93c525242f66" xlink:to="loc_us-gaap_InterestRateSwapMember_bd10dab2-6337-4f67-820f-889364e67833" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_fd2021fb-4428-4cf8-a4da-7f737a0931e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_a353a843-6f01-40a5-a1df-93c525242f66" xlink:to="loc_us-gaap_InterestRateContractMember_fd2021fb-4428-4cf8-a4da-7f737a0931e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RiskSharingAssetsLiabilitiesMember_f0f9536b-a531-4b58-a843-36b2cd115f92" xlink:href="afrm-20250630.xsd#afrm_RiskSharingAssetsLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_a353a843-6f01-40a5-a1df-93c525242f66" xlink:to="loc_afrm_RiskSharingAssetsLiabilitiesMember_f0f9536b-a531-4b58-a843-36b2cd115f92" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_d599a62d-3ae0-4e17-86f2-d260590dee60" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_7d168603-dcd9-4026-8603-fef37f4eac06" xlink:to="loc_us-gaap_DerivativeNotionalAmount_d599a62d-3ae0-4e17-86f2-d260590dee60" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_8f78ac65-f44f-4e47-850a-3be8ab53da1b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_7d168603-dcd9-4026-8603-fef37f4eac06" xlink:to="loc_us-gaap_DerivativeAssets_8f78ac65-f44f-4e47-850a-3be8ab53da1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_d3b460a2-2dc5-4563-abfd-1611ff8a28bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_7d168603-dcd9-4026-8603-fef37f4eac06" xlink:to="loc_us-gaap_DerivativeLiabilities_d3b460a2-2dc5-4563-abfd-1611ff8a28bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_d60827d0-2c8e-4c72-82be-6f0d3e165d33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_7d168603-dcd9-4026-8603-fef37f4eac06" xlink:to="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_d60827d0-2c8e-4c72-82be-6f0d3e165d33" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/DerivativeFinancialInstrumentsScheduleofImpactofCashFlowHedgesonAOCIDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#DerivativeFinancialInstrumentsScheduleofImpactofCashFlowHedgesonAOCIDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/DerivativeFinancialInstrumentsScheduleofImpactofCashFlowHedgesonAOCIDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_6078aeb3-84ce-44e2-8b4b-2e6c61425fc5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_14659d83-b314-4a02-b6af-2298c56e2521" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_6078aeb3-84ce-44e2-8b4b-2e6c61425fc5" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_14659d83-b314-4a02-b6af-2298c56e2521" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_6409a776-06a0-4b93-a42e-20034565a3c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_14659d83-b314-4a02-b6af-2298c56e2521" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_6409a776-06a0-4b93-a42e-20034565a3c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_6409a776-06a0-4b93-a42e-20034565a3c4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_6409a776-06a0-4b93-a42e-20034565a3c4" xlink:to="loc_us-gaap_EquityComponentDomain_6409a776-06a0-4b93-a42e-20034565a3c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_6bb75dea-db9a-4814-b39f-d730465351a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_6409a776-06a0-4b93-a42e-20034565a3c4" xlink:to="loc_us-gaap_EquityComponentDomain_6bb75dea-db9a-4814-b39f-d730465351a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_9b02e080-e7e7-4adc-959c-b216a2cd16b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6bb75dea-db9a-4814-b39f-d730465351a1" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_9b02e080-e7e7-4adc-959c-b216a2cd16b7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_1da74b3a-7b8f-4329-aa5d-6db88701dcc8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_6078aeb3-84ce-44e2-8b4b-2e6c61425fc5" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_1da74b3a-7b8f-4329-aa5d-6db88701dcc8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_d8734d71-35d4-4553-9aaa-d539eac29d9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_1da74b3a-7b8f-4329-aa5d-6db88701dcc8" xlink:to="loc_us-gaap_StockholdersEquity_d8734d71-35d4-4553-9aaa-d539eac29d9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent_0d2f20b8-5831-4f9a-8ae4-1da3a92dc665" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_1da74b3a-7b8f-4329-aa5d-6db88701dcc8" xlink:to="loc_us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent_0d2f20b8-5831-4f9a-8ae4-1da3a92dc665" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_8e1ca3c6-5e93-4b2f-a93a-f3ecb9a059ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_1da74b3a-7b8f-4329-aa5d-6db88701dcc8" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_8e1ca3c6-5e93-4b2f-a93a-f3ecb9a059ee" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_b84086cb-bcae-41a3-b8de-2eee3411202d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_651b53d2-c6ce-4f2a-b476-b2167c5dabde" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_6078aeb3-84ce-44e2-8b4b-2e6c61425fc5" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_651b53d2-c6ce-4f2a-b476-b2167c5dabde" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/DerivativeFinancialInstrumentsScheduleofGainLossonDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#DerivativeFinancialInstrumentsScheduleofGainLossonDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/DerivativeFinancialInstrumentsScheduleofGainLossonDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_11a2a026-cf9d-4b59-8c4c-1acd481dbcad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_6f4bafbd-735a-47c3-8e12-e91b5f0c3a5d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_11a2a026-cf9d-4b59-8c4c-1acd481dbcad" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_6f4bafbd-735a-47c3-8e12-e91b5f0c3a5d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_2263020a-ae7a-4b7f-a12f-83997a1d84c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_6f4bafbd-735a-47c3-8e12-e91b5f0c3a5d" xlink:to="loc_us-gaap_HedgingDesignationAxis_2263020a-ae7a-4b7f-a12f-83997a1d84c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_2263020a-ae7a-4b7f-a12f-83997a1d84c1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_2263020a-ae7a-4b7f-a12f-83997a1d84c1" xlink:to="loc_us-gaap_HedgingDesignationDomain_2263020a-ae7a-4b7f-a12f-83997a1d84c1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_43f234a6-2f61-4fb1-980b-33ca6bd3117c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_2263020a-ae7a-4b7f-a12f-83997a1d84c1" xlink:to="loc_us-gaap_HedgingDesignationDomain_43f234a6-2f61-4fb1-980b-33ca6bd3117c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_3c8802ea-8462-4e99-998a-055513e6fde8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_43f234a6-2f61-4fb1-980b-33ca6bd3117c" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_3c8802ea-8462-4e99-998a-055513e6fde8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_02783ab3-2a0c-4982-ae24-86fe4ed0bab7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_43f234a6-2f61-4fb1-980b-33ca6bd3117c" xlink:to="loc_us-gaap_NondesignatedMember_02783ab3-2a0c-4982-ae24-86fe4ed0bab7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_c1496c95-5e02-4454-9cef-198c4790ab7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_6f4bafbd-735a-47c3-8e12-e91b5f0c3a5d" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_c1496c95-5e02-4454-9cef-198c4790ab7e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_c1496c95-5e02-4454-9cef-198c4790ab7e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_c1496c95-5e02-4454-9cef-198c4790ab7e" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_c1496c95-5e02-4454-9cef-198c4790ab7e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_de4e637b-989f-4ecf-bcc8-88f05880792b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_c1496c95-5e02-4454-9cef-198c4790ab7e" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_de4e637b-989f-4ecf-bcc8-88f05880792b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseMember_443ab0ae-0636-4d4b-ad71-c8d4025b6b6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_de4e637b-989f-4ecf-bcc8-88f05880792b" xlink:to="loc_us-gaap_InterestExpenseMember_443ab0ae-0636-4d4b-ad71-c8d4025b6b6e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpenseMember_0c210f77-bbbb-40d7-a74a-f81f007a1931" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_de4e637b-989f-4ecf-bcc8-88f05880792b" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpenseMember_0c210f77-bbbb-40d7-a74a-f81f007a1931" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_03e10c45-7727-44c7-9a4d-57ed54db42cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_11a2a026-cf9d-4b59-8c4c-1acd481dbcad" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_03e10c45-7727-44c7-9a4d-57ed54db42cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_f331bd14-c4d3-481a-bd47-62f22793233d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_11a2a026-cf9d-4b59-8c4c-1acd481dbcad" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_f331bd14-c4d3-481a-bd47-62f22793233d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofAssetsandLiabilitiesFairValueMeasuredonRecurringBasisDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesScheduleofAssetsandLiabilitiesFairValueMeasuredonRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofAssetsandLiabilitiesFairValueMeasuredonRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7a66dc2-5b67-4cd3-aac2-7dd13538812b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_33b283eb-7787-4478-a5a2-b24242ca8dd4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7a66dc2-5b67-4cd3-aac2-7dd13538812b" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_33b283eb-7787-4478-a5a2-b24242ca8dd4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_96405dc3-a52e-4cf4-9f4e-196c81965dbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_33b283eb-7787-4478-a5a2-b24242ca8dd4" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_96405dc3-a52e-4cf4-9f4e-196c81965dbd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_96405dc3-a52e-4cf4-9f4e-196c81965dbd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_96405dc3-a52e-4cf4-9f4e-196c81965dbd" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_96405dc3-a52e-4cf4-9f4e-196c81965dbd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_9e84bc92-f03c-4341-8215-1a7509821938" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_96405dc3-a52e-4cf4-9f4e-196c81965dbd" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_9e84bc92-f03c-4341-8215-1a7509821938" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_67acb7bf-369d-4169-9d25-fcf8e754966b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_9e84bc92-f03c-4341-8215-1a7509821938" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_67acb7bf-369d-4169-9d25-fcf8e754966b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_759504de-56fd-4603-bf54-d2e0147fa26b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_9e84bc92-f03c-4341-8215-1a7509821938" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_759504de-56fd-4603-bf54-d2e0147fa26b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_cb075198-cbf3-47d0-a4e6-896445b5ec53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_9e84bc92-f03c-4341-8215-1a7509821938" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_cb075198-cbf3-47d0-a4e6-896445b5ec53" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_085bf28c-34c3-4adf-93f8-32a252867f7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_33b283eb-7787-4478-a5a2-b24242ca8dd4" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_085bf28c-34c3-4adf-93f8-32a252867f7c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_085bf28c-34c3-4adf-93f8-32a252867f7c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_085bf28c-34c3-4adf-93f8-32a252867f7c" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_085bf28c-34c3-4adf-93f8-32a252867f7c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_1549c491-4c24-4357-85c1-e66e21e9cec2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_085bf28c-34c3-4adf-93f8-32a252867f7c" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_1549c491-4c24-4357-85c1-e66e21e9cec2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_b3602436-fdad-4ab0-8d3e-cabdd89a6811" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_1549c491-4c24-4357-85c1-e66e21e9cec2" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_b3602436-fdad-4ab0-8d3e-cabdd89a6811" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_77bc5d96-6e5d-434d-8031-01fb381dd57b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_33b283eb-7787-4478-a5a2-b24242ca8dd4" xlink:to="loc_us-gaap_FinancialInstrumentAxis_77bc5d96-6e5d-434d-8031-01fb381dd57b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_77bc5d96-6e5d-434d-8031-01fb381dd57b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_77bc5d96-6e5d-434d-8031-01fb381dd57b" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_77bc5d96-6e5d-434d-8031-01fb381dd57b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ac7941f5-83cd-4f4a-bdf5-352813275059" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_77bc5d96-6e5d-434d-8031-01fb381dd57b" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ac7941f5-83cd-4f4a-bdf5-352813275059" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_7b73dd63-983c-4cb2-840e-a6c77734e9ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ac7941f5-83cd-4f4a-bdf5-352813275059" xlink:to="loc_us-gaap_MoneyMarketFundsMember_7b73dd63-983c-4cb2-840e-a6c77734e9ab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AgencySecuritiesMember_69b0a0cd-dacd-4751-8d10-01ced4381284" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AgencySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ac7941f5-83cd-4f4a-bdf5-352813275059" xlink:to="loc_us-gaap_AgencySecuritiesMember_69b0a0cd-dacd-4751-8d10-01ced4381284" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaperMember_f91e1f73-10fc-4fff-93c1-c889a1feaa9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPaperMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ac7941f5-83cd-4f4a-bdf5-352813275059" xlink:to="loc_us-gaap_CommercialPaperMember_f91e1f73-10fc-4fff-93c1-c889a1feaa9f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_2307dbff-2c05-4d23-9185-2b7e27c89753" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ac7941f5-83cd-4f4a-bdf5-352813275059" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_2307dbff-2c05-4d23-9185-2b7e27c89753" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertificatesOfDepositMember_11aa3fe7-8370-4290-b379-0fc8207aff81" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CertificatesOfDepositMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ac7941f5-83cd-4f4a-bdf5-352813275059" xlink:to="loc_us-gaap_CertificatesOfDepositMember_11aa3fe7-8370-4290-b379-0fc8207aff81" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateBondSecuritiesMember_35194c5a-c54f-4ff0-8617-c5b6d1fe6eb4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateBondSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ac7941f5-83cd-4f4a-bdf5-352813275059" xlink:to="loc_us-gaap_CorporateBondSecuritiesMember_35194c5a-c54f-4ff0-8617-c5b6d1fe6eb4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_4f0264f7-90cb-48ce-8d49-9ce184395024" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ac7941f5-83cd-4f4a-bdf5-352813275059" xlink:to="loc_us-gaap_MunicipalBondsMember_4f0264f7-90cb-48ce-8d49-9ce184395024" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_NonUSGovernmentAgenciesDebtSecuritiesMember_3d375e64-2e8a-4a80-be09-6a2d52d366b0" xlink:href="afrm-20250630.xsd#afrm_NonUSGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ac7941f5-83cd-4f4a-bdf5-352813275059" xlink:to="loc_afrm_NonUSGovernmentAgenciesDebtSecuritiesMember_3d375e64-2e8a-4a80-be09-6a2d52d366b0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SecuritizationNotesReceivableAndCertificatesMember_07003c61-9b82-47da-b1c3-ec84abb48345" xlink:href="afrm-20250630.xsd#afrm_SecuritizationNotesReceivableAndCertificatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ac7941f5-83cd-4f4a-bdf5-352813275059" xlink:to="loc_afrm_SecuritizationNotesReceivableAndCertificatesMember_07003c61-9b82-47da-b1c3-ec84abb48345" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_30c355d6-76f4-4036-bc09-7f67a9fd8ec7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7a66dc2-5b67-4cd3-aac2-7dd13538812b" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_30c355d6-76f4-4036-bc09-7f67a9fd8ec7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RestrictedCashFairValueDisclosure_71b2b75b-533e-4710-ac43-759c70578c92" xlink:href="afrm-20250630.xsd#afrm_RestrictedCashFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7a66dc2-5b67-4cd3-aac2-7dd13538812b" xlink:to="loc_afrm_RestrictedCashFairValueDisclosure_71b2b75b-533e-4710-ac43-759c70578c92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ResidualTrustCertificatesAssetFairValueDisclosure_29ffa832-7678-4024-a189-076de3bb0184" xlink:href="afrm-20250630.xsd#afrm_ResidualTrustCertificatesAssetFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7a66dc2-5b67-4cd3-aac2-7dd13538812b" xlink:to="loc_afrm_ResidualTrustCertificatesAssetFairValueDisclosure_29ffa832-7678-4024-a189-076de3bb0184" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ResidualInterestsInStructuredTransactionsFairValueDisclosure_6e64656b-52f0-4d7f-a9c8-ed3a20e78f38" xlink:href="afrm-20250630.xsd#afrm_ResidualInterestsInStructuredTransactionsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7a66dc2-5b67-4cd3-aac2-7dd13538812b" xlink:to="loc_afrm_ResidualInterestsInStructuredTransactionsFairValueDisclosure_6e64656b-52f0-4d7f-a9c8-ed3a20e78f38" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAsset_6138bfe5-5369-4a09-8abb-9dcada75c45c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7a66dc2-5b67-4cd3-aac2-7dd13538812b" xlink:to="loc_us-gaap_ServicingAsset_6138bfe5-5369-4a09-8abb-9dcada75c45c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_809b46a7-9616-4a59-b01f-05df51236d9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7a66dc2-5b67-4cd3-aac2-7dd13538812b" xlink:to="loc_us-gaap_DerivativeAssets_809b46a7-9616-4a59-b01f-05df51236d9b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RiskSharingAsset_f86239ee-20e6-41ca-8833-b135755ac367" xlink:href="afrm-20250630.xsd#afrm_RiskSharingAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7a66dc2-5b67-4cd3-aac2-7dd13538812b" xlink:to="loc_afrm_RiskSharingAsset_f86239ee-20e6-41ca-8833-b135755ac367" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_c3fe97e1-52f8-4ba4-a367-4598e07f5e26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7a66dc2-5b67-4cd3-aac2-7dd13538812b" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_c3fe97e1-52f8-4ba4-a367-4598e07f5e26" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingLiabilityAtFairValueAmount_40519891-a1e4-4a09-b2e5-4f097f52b58f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingLiabilityAtFairValueAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7a66dc2-5b67-4cd3-aac2-7dd13538812b" xlink:to="loc_us-gaap_ServicingLiabilityAtFairValueAmount_40519891-a1e4-4a09-b2e5-4f097f52b58f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_PerformanceFeeLiabilityFairValueDisclosure_421036a6-4100-439b-aaf7-a9927a68842f" xlink:href="afrm-20250630.xsd#afrm_PerformanceFeeLiabilityFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7a66dc2-5b67-4cd3-aac2-7dd13538812b" xlink:to="loc_afrm_PerformanceFeeLiabilityFairValueDisclosure_421036a6-4100-439b-aaf7-a9927a68842f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementProfitShareLiabilityFairValueDisclosure_64e9ec78-f83c-419a-a062-bd5c24000333" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementProfitShareLiabilityFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7a66dc2-5b67-4cd3-aac2-7dd13538812b" xlink:to="loc_afrm_CommercialAgreementProfitShareLiabilityFairValueDisclosure_64e9ec78-f83c-419a-a062-bd5c24000333" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RiskSharingLiability_0d209366-e125-4dee-9ec8-b3a6882b8bd6" xlink:href="afrm-20250630.xsd#afrm_RiskSharingLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7a66dc2-5b67-4cd3-aac2-7dd13538812b" xlink:to="loc_afrm_RiskSharingLiability_0d209366-e125-4dee-9ec8-b3a6882b8bd6" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_aaf5a159-f58a-4e70-b702-0b116a952324" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7a66dc2-5b67-4cd3-aac2-7dd13538812b" xlink:to="loc_us-gaap_DerivativeLiabilities_aaf5a159-f58a-4e70-b702-0b116a952324" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_2df96b77-2b05-4e76-8803-18fcf8a93437" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7a66dc2-5b67-4cd3-aac2-7dd13538812b" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_2df96b77-2b05-4e76-8803-18fcf8a93437" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesAdditionalInformationDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7ba1f722-4e0d-439b-92ce-8199039e5d81" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_cf7bf13e-0e25-498c-ad60-c0a1e70a3b73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7ba1f722-4e0d-439b-92ce-8199039e5d81" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_cf7bf13e-0e25-498c-ad60-c0a1e70a3b73" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_8f0e563d-5d38-42d3-b4bc-8cc8731a1282" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_cf7bf13e-0e25-498c-ad60-c0a1e70a3b73" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_8f0e563d-5d38-42d3-b4bc-8cc8731a1282" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_8f0e563d-5d38-42d3-b4bc-8cc8731a1282_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_8f0e563d-5d38-42d3-b4bc-8cc8731a1282" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_8f0e563d-5d38-42d3-b4bc-8cc8731a1282_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_9d78ef0c-3cfd-4b72-8fb3-f01b5c87f524" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_8f0e563d-5d38-42d3-b4bc-8cc8731a1282" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_9d78ef0c-3cfd-4b72-8fb3-f01b5c87f524" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SeniorNotesAndResidualTrustCertificatesMember_122443bb-41e0-4ad6-a9cf-634c69982e46" xlink:href="afrm-20250630.xsd#afrm_SeniorNotesAndResidualTrustCertificatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_9d78ef0c-3cfd-4b72-8fb3-f01b5c87f524" xlink:to="loc_afrm_SeniorNotesAndResidualTrustCertificatesMember_122443bb-41e0-4ad6-a9cf-634c69982e46" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ResidualInterestsInStructuredTransactionsMember_58a63782-9ee2-4342-80e4-ad49b1b73865" xlink:href="afrm-20250630.xsd#afrm_ResidualInterestsInStructuredTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_9d78ef0c-3cfd-4b72-8fb3-f01b5c87f524" xlink:to="loc_afrm_ResidualInterestsInStructuredTransactionsMember_58a63782-9ee2-4342-80e4-ad49b1b73865" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_LoansSoldContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding_f2ec830f-5893-42a5-9b0d-85e9399c3d67" xlink:href="afrm-20250630.xsd#afrm_LoansSoldContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7ba1f722-4e0d-439b-92ce-8199039e5d81" xlink:to="loc_afrm_LoansSoldContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding_f2ec830f-5893-42a5-9b0d-85e9399c3d67" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding_e4e81a66-780e-4452-828c-7d03ef6b3a3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7ba1f722-4e0d-439b-92ce-8199039e5d81" xlink:to="loc_us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding_e4e81a66-780e-4452-828c-7d03ef6b3a3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets_3a5f7903-eebd-4ae4-9605-886e27a1c089" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7ba1f722-4e0d-439b-92ce-8199039e5d81" xlink:to="loc_us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets_3a5f7903-eebd-4ae4-9605-886e27a1c089" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAsset_8d11ba40-7af8-4040-8ee2-20c0588fb6b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7ba1f722-4e0d-439b-92ce-8199039e5d81" xlink:to="loc_us-gaap_ServicingAsset_8d11ba40-7af8-4040-8ee2-20c0588fb6b2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingLiability_e67e9bd0-4df8-4fda-88f8-d45cf229643c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7ba1f722-4e0d-439b-92ce-8199039e5d81" xlink:to="loc_us-gaap_ServicingLiability_e67e9bd0-4df8-4fda-88f8-d45cf229643c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_b1a63503-3840-47dd-8574-3c0e4bbf2a4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7ba1f722-4e0d-439b-92ce-8199039e5d81" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_b1a63503-3840-47dd-8574-3c0e4bbf2a4b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_VariableInterestEntityNotPrimaryBeneficiaryRequiredEconomicRiskRetention_8dd267e4-4c32-4432-90d3-11780fcc4ab8" xlink:href="afrm-20250630.xsd#afrm_VariableInterestEntityNotPrimaryBeneficiaryRequiredEconomicRiskRetention"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7ba1f722-4e0d-439b-92ce-8199039e5d81" xlink:to="loc_afrm_VariableInterestEntityNotPrimaryBeneficiaryRequiredEconomicRiskRetention_8dd267e4-4c32-4432-90d3-11780fcc4ab8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfOtherComprehensiveIncomeExtensibleList_2033c4a7-9272-42be-a270-c4254b18cb60" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfOtherComprehensiveIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7ba1f722-4e0d-439b-92ce-8199039e5d81" xlink:to="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfOtherComprehensiveIncomeExtensibleList_2033c4a7-9272-42be-a270-c4254b18cb60" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofQuantitativeInformationAboutSignificantUnobservableInputsforServicingAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesScheduleofQuantitativeInformationAboutSignificantUnobservableInputsforServicingAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofQuantitativeInformationAboutSignificantUnobservableInputsforServicingAssetsandLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_02a78c9f-a7fc-46bb-a520-332b911d1a25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_5c4cce7b-f717-4b02-a6d1-591107bedd18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_02a78c9f-a7fc-46bb-a520-332b911d1a25" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_5c4cce7b-f717-4b02-a6d1-591107bedd18" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_4be2c33e-1c2d-4115-ab17-bc64d6eb06d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_5c4cce7b-f717-4b02-a6d1-591107bedd18" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_4be2c33e-1c2d-4115-ab17-bc64d6eb06d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_4be2c33e-1c2d-4115-ab17-bc64d6eb06d4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_4be2c33e-1c2d-4115-ab17-bc64d6eb06d4" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_4be2c33e-1c2d-4115-ab17-bc64d6eb06d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_d6448ef9-5598-45d7-9b62-b38f932d7e4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_4be2c33e-1c2d-4115-ab17-bc64d6eb06d4" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_d6448ef9-5598-45d7-9b62-b38f932d7e4d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_834955a1-7e17-4384-9e48-903bee524be7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_d6448ef9-5598-45d7-9b62-b38f932d7e4d" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_834955a1-7e17-4384-9e48-903bee524be7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_MeasurementInputAdequateCompensationMember_93ea06cd-dc89-47af-a1f5-a745079add85" xlink:href="afrm-20250630.xsd#afrm_MeasurementInputAdequateCompensationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_d6448ef9-5598-45d7-9b62-b38f932d7e4d" xlink:to="loc_afrm_MeasurementInputAdequateCompensationMember_93ea06cd-dc89-47af-a1f5-a745079add85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDefaultRateMember_3dbc1ee9-58b8-4dbb-a514-aef24fc35c41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDefaultRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_d6448ef9-5598-45d7-9b62-b38f932d7e4d" xlink:to="loc_us-gaap_MeasurementInputDefaultRateMember_3dbc1ee9-58b8-4dbb-a514-aef24fc35c41" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_2c669ec0-fbab-4137-83a5-fc14f99757f2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_5c4cce7b-f717-4b02-a6d1-591107bedd18" xlink:to="loc_srt_RangeAxis_2c669ec0-fbab-4137-83a5-fc14f99757f2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2c669ec0-fbab-4137-83a5-fc14f99757f2_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_2c669ec0-fbab-4137-83a5-fc14f99757f2" xlink:to="loc_srt_RangeMember_2c669ec0-fbab-4137-83a5-fc14f99757f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_355c6c31-e303-42bd-a6d8-23e015e929e7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_2c669ec0-fbab-4137-83a5-fc14f99757f2" xlink:to="loc_srt_RangeMember_355c6c31-e303-42bd-a6d8-23e015e929e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_5e42ea4d-8e0d-4303-bd31-6ed81f5eadd5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_355c6c31-e303-42bd-a6d8-23e015e929e7" xlink:to="loc_srt_MinimumMember_5e42ea4d-8e0d-4303-bd31-6ed81f5eadd5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_8ff60ad6-8e23-46b2-a9d3-f3220580f78b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_355c6c31-e303-42bd-a6d8-23e015e929e7" xlink:to="loc_srt_MaximumMember_8ff60ad6-8e23-46b2-a9d3-f3220580f78b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_5c216672-2340-4036-8bf0-c5731765d6c7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_355c6c31-e303-42bd-a6d8-23e015e929e7" xlink:to="loc_srt_WeightedAverageMember_5c216672-2340-4036-8bf0-c5731765d6c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetMeasurementInput_9b0f4b2a-14ad-46d6-90c8-65e37a06d055" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingAssetMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_02a78c9f-a7fc-46bb-a520-332b911d1a25" xlink:to="loc_us-gaap_ServicingAssetMeasurementInput_9b0f4b2a-14ad-46d6-90c8-65e37a06d055" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingLiabilityMeasurementInput_ac7c975e-10a1-4281-b19b-4c8dd7836a22" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_02a78c9f-a7fc-46bb-a520-332b911d1a25" xlink:to="loc_us-gaap_ServicingLiabilityMeasurementInput_ac7c975e-10a1-4281-b19b-4c8dd7836a22" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofAdverseChangesinEstimatesforServicingAssetsandLiabilitiesInputsDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesScheduleofAdverseChangesinEstimatesforServicingAssetsandLiabilitiesInputsDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofAdverseChangesinEstimatesforServicingAssetsandLiabilitiesInputsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c0e7911f-ae84-4bd7-af2e-0aeb12aed259" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_0d32972d-8cbd-4b3c-bfad-fd8aaf230f05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c0e7911f-ae84-4bd7-af2e-0aeb12aed259" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_0d32972d-8cbd-4b3c-bfad-fd8aaf230f05" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_df1de6f5-4758-44a2-9218-bfc9cd59ca3b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_0d32972d-8cbd-4b3c-bfad-fd8aaf230f05" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_df1de6f5-4758-44a2-9218-bfc9cd59ca3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_df1de6f5-4758-44a2-9218-bfc9cd59ca3b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_df1de6f5-4758-44a2-9218-bfc9cd59ca3b" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_df1de6f5-4758-44a2-9218-bfc9cd59ca3b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_9229e1ce-8ced-456f-9701-edc66bf925e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_df1de6f5-4758-44a2-9218-bfc9cd59ca3b" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_9229e1ce-8ced-456f-9701-edc66bf925e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDefaultRateMember_9546ee24-2c3e-4550-a3db-9a5d8d7ddfc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDefaultRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_9229e1ce-8ced-456f-9701-edc66bf925e8" xlink:to="loc_us-gaap_MeasurementInputDefaultRateMember_9546ee24-2c3e-4550-a3db-9a5d8d7ddfc1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_MeasurementInputAdequateCompensationMember_c332165e-c6ff-4782-8d1f-8dae179c93ed" xlink:href="afrm-20250630.xsd#afrm_MeasurementInputAdequateCompensationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_9229e1ce-8ced-456f-9701-edc66bf925e8" xlink:to="loc_afrm_MeasurementInputAdequateCompensationMember_c332165e-c6ff-4782-8d1f-8dae179c93ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_6faa3a53-2934-4769-a6b9-314a8ac2e0e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_9229e1ce-8ced-456f-9701-edc66bf925e8" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_6faa3a53-2934-4769-a6b9-314a8ac2e0e2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueServicingAssetEffectOfTwentyFivePercentagePointIncreaseInMeasurementInput_b2050da5-05f9-48cf-aed1-5f6fdd4a0fdc" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueServicingAssetEffectOfTwentyFivePercentagePointIncreaseInMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c0e7911f-ae84-4bd7-af2e-0aeb12aed259" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueServicingAssetEffectOfTwentyFivePercentagePointIncreaseInMeasurementInput_b2050da5-05f9-48cf-aed1-5f6fdd4a0fdc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueServicingAssetEffectOfFiftyPercentagePointIncreaseInMeasurementInput_e305cfa1-87f8-4c84-8b54-b1bdb31d5ebe" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueServicingAssetEffectOfFiftyPercentagePointIncreaseInMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c0e7911f-ae84-4bd7-af2e-0aeb12aed259" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueServicingAssetEffectOfFiftyPercentagePointIncreaseInMeasurementInput_e305cfa1-87f8-4c84-8b54-b1bdb31d5ebe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueServicingAssetEffectOfTenPercentagePointIncreaseInMeasurementInput_3c37448e-f2c5-41f5-83dd-03516f7e2d96" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueServicingAssetEffectOfTenPercentagePointIncreaseInMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c0e7911f-ae84-4bd7-af2e-0aeb12aed259" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueServicingAssetEffectOfTenPercentagePointIncreaseInMeasurementInput_3c37448e-f2c5-41f5-83dd-03516f7e2d96" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueServicingAssetEffectOfTwentyPercentagePointIncreaseInMeasurementInput_b16ff19d-8e39-4a07-9e9a-29416a22fbca" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueServicingAssetEffectOfTwentyPercentagePointIncreaseInMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c0e7911f-ae84-4bd7-af2e-0aeb12aed259" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueServicingAssetEffectOfTwentyPercentagePointIncreaseInMeasurementInput_b16ff19d-8e39-4a07-9e9a-29416a22fbca" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueServicingLiabilityEffectOfTwentyFivePercentagePointIncreaseInMeasurementInput_be084c56-6bc6-4dc2-a8c0-099caabf32cc" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueServicingLiabilityEffectOfTwentyFivePercentagePointIncreaseInMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c0e7911f-ae84-4bd7-af2e-0aeb12aed259" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueServicingLiabilityEffectOfTwentyFivePercentagePointIncreaseInMeasurementInput_be084c56-6bc6-4dc2-a8c0-099caabf32cc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueServicingLiabilityEffectOfFiftyPercentagePointIncreaseInMeasurementInput_aa8716ce-018b-496a-a388-d21ec314a6a0" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueServicingLiabilityEffectOfFiftyPercentagePointIncreaseInMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c0e7911f-ae84-4bd7-af2e-0aeb12aed259" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueServicingLiabilityEffectOfFiftyPercentagePointIncreaseInMeasurementInput_aa8716ce-018b-496a-a388-d21ec314a6a0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueServicingLiabilityEffectOfTenPercentagePointIncreaseInMeasurementInput_163eec79-a1ff-4232-b9a6-db0416576552" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueServicingLiabilityEffectOfTenPercentagePointIncreaseInMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c0e7911f-ae84-4bd7-af2e-0aeb12aed259" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueServicingLiabilityEffectOfTenPercentagePointIncreaseInMeasurementInput_163eec79-a1ff-4232-b9a6-db0416576552" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueServicingLiabilityEffectOfTwentyPercentagePointIncreaseInMeasurementInput_67dded44-63fd-4c67-99b6-adf2879296d9" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueServicingLiabilityEffectOfTwentyPercentagePointIncreaseInMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c0e7911f-ae84-4bd7-af2e-0aeb12aed259" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueServicingLiabilityEffectOfTwentyPercentagePointIncreaseInMeasurementInput_67dded44-63fd-4c67-99b6-adf2879296d9" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofFairValueofPerformanceFeeLiabilityDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesScheduleofFairValueofPerformanceFeeLiabilityDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofFairValueofPerformanceFeeLiabilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_944b1643-6a8c-4fce-9589-31f0a57b4003" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_9be82557-24ba-4e03-afb5-8ac6440dd750" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_944b1643-6a8c-4fce-9589-31f0a57b4003" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_9be82557-24ba-4e03-afb5-8ac6440dd750" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_42fa6452-27bb-4135-8aba-19621bfeef12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_9be82557-24ba-4e03-afb5-8ac6440dd750" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_42fa6452-27bb-4135-8aba-19621bfeef12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_42fa6452-27bb-4135-8aba-19621bfeef12_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_42fa6452-27bb-4135-8aba-19621bfeef12" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_42fa6452-27bb-4135-8aba-19621bfeef12_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_b9d2dbd8-dc24-4da0-9efe-76e5db6803fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_42fa6452-27bb-4135-8aba-19621bfeef12" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_b9d2dbd8-dc24-4da0-9efe-76e5db6803fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_PerformanceFeeLiabilityMember_9a9602dc-242a-4f40-84fb-4c0383cfc177" xlink:href="afrm-20250630.xsd#afrm_PerformanceFeeLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_b9d2dbd8-dc24-4da0-9efe-76e5db6803fc" xlink:to="loc_afrm_PerformanceFeeLiabilityMember_9a9602dc-242a-4f40-84fb-4c0383cfc177" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_cc82cc1f-d897-4b70-bf9f-2dc816a5f256" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_944b1643-6a8c-4fce-9589-31f0a57b4003" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_cc82cc1f-d897-4b70-bf9f-2dc816a5f256" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_a429184a-b0a2-417d-98ff-124fc31feffc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_cc82cc1f-d897-4b70-bf9f-2dc816a5f256" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_a429184a-b0a2-417d-98ff-124fc31feffc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_25e274e6-92f5-478d-814a-975e49a7589f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_cc82cc1f-d897-4b70-bf9f-2dc816a5f256" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_25e274e6-92f5-478d-814a-975e49a7589f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_3645e636-c5eb-4c3e-89f9-ab8a27cf5792" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_cc82cc1f-d897-4b70-bf9f-2dc816a5f256" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_3645e636-c5eb-4c3e-89f9-ab8a27cf5792" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_9f8051ad-9bb5-457c-b7fb-24741a684887" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_cc82cc1f-d897-4b70-bf9f-2dc816a5f256" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_9f8051ad-9bb5-457c-b7fb-24741a684887" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_7acfa997-8b48-48a0-beb6-d960d1eceba9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofQuantitativeInformationAboutSignificantUnobservableInputsforPerformanceFeeLiabilityDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesScheduleofQuantitativeInformationAboutSignificantUnobservableInputsforPerformanceFeeLiabilityDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofQuantitativeInformationAboutSignificantUnobservableInputsforPerformanceFeeLiabilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c4bdb196-639f-47d1-9fbb-67441a1e91d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_c7c379f4-6e9e-4187-8935-52048d51fb84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c4bdb196-639f-47d1-9fbb-67441a1e91d2" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_c7c379f4-6e9e-4187-8935-52048d51fb84" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_2ad7c3c1-a68f-4953-bc2a-568e4b3489cb" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_c7c379f4-6e9e-4187-8935-52048d51fb84" xlink:to="loc_srt_RangeAxis_2ad7c3c1-a68f-4953-bc2a-568e4b3489cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2ad7c3c1-a68f-4953-bc2a-568e4b3489cb_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_2ad7c3c1-a68f-4953-bc2a-568e4b3489cb" xlink:to="loc_srt_RangeMember_2ad7c3c1-a68f-4953-bc2a-568e4b3489cb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c3fab7a7-9884-4394-b7dc-b7204e00f403" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_2ad7c3c1-a68f-4953-bc2a-568e4b3489cb" xlink:to="loc_srt_RangeMember_c3fab7a7-9884-4394-b7dc-b7204e00f403" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_c9c78b3d-15a2-40de-9839-1ba21479ae16" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_c3fab7a7-9884-4394-b7dc-b7204e00f403" xlink:to="loc_srt_MinimumMember_c9c78b3d-15a2-40de-9839-1ba21479ae16" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_3d50765a-6141-4413-b676-b23d4d4dba7c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_c3fab7a7-9884-4394-b7dc-b7204e00f403" xlink:to="loc_srt_MaximumMember_3d50765a-6141-4413-b676-b23d4d4dba7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_d8fe8c7e-5c04-4181-96f3-5dd3d821ad11" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_c3fab7a7-9884-4394-b7dc-b7204e00f403" xlink:to="loc_srt_WeightedAverageMember_d8fe8c7e-5c04-4181-96f3-5dd3d821ad11" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_a1b08478-0d62-41f3-ba3e-6f4adb753b89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_c7c379f4-6e9e-4187-8935-52048d51fb84" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_a1b08478-0d62-41f3-ba3e-6f4adb753b89" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_a1b08478-0d62-41f3-ba3e-6f4adb753b89_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_a1b08478-0d62-41f3-ba3e-6f4adb753b89" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_a1b08478-0d62-41f3-ba3e-6f4adb753b89_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_0fc96509-4024-4767-ba7c-3e3f129506be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_a1b08478-0d62-41f3-ba3e-6f4adb753b89" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_0fc96509-4024-4767-ba7c-3e3f129506be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_ee203099-b543-4195-947c-4cafa3fc7d80" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_0fc96509-4024-4767-ba7c-3e3f129506be" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_ee203099-b543-4195-947c-4cafa3fc7d80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_MeasurementInputRefundRateMember_8b36fb8d-6681-480c-b32a-744955424582" xlink:href="afrm-20250630.xsd#afrm_MeasurementInputRefundRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_0fc96509-4024-4767-ba7c-3e3f129506be" xlink:to="loc_afrm_MeasurementInputRefundRateMember_8b36fb8d-6681-480c-b32a-744955424582" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDefaultRateMember_2695e471-90f5-41a4-acdc-344aee0244c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDefaultRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_0fc96509-4024-4767-ba7c-3e3f129506be" xlink:to="loc_us-gaap_MeasurementInputDefaultRateMember_2695e471-90f5-41a4-acdc-344aee0244c4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_PerformanceFeeLiabilityMeasurementInput_86cbb5cb-beea-4239-bf43-855716f155b8" xlink:href="afrm-20250630.xsd#afrm_PerformanceFeeLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c4bdb196-639f-47d1-9fbb-67441a1e91d2" xlink:to="loc_afrm_PerformanceFeeLiabilityMeasurementInput_86cbb5cb-beea-4239-bf43-855716f155b8" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofFairValueofSeniorNotesandResidualTrustCertificatesDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesScheduleofFairValueofSeniorNotesandResidualTrustCertificatesDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofFairValueofSeniorNotesandResidualTrustCertificatesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_dd870436-5a3a-4e60-ba6a-fe42929a016c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_4fecf6c2-f9de-4346-bf08-1a1404d2d914" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_dd870436-5a3a-4e60-ba6a-fe42929a016c" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_4fecf6c2-f9de-4346-bf08-1a1404d2d914" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_0ae44961-0d14-4386-978c-a26c52eb2079" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_4fecf6c2-f9de-4346-bf08-1a1404d2d914" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_0ae44961-0d14-4386-978c-a26c52eb2079" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_0ae44961-0d14-4386-978c-a26c52eb2079_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_0ae44961-0d14-4386-978c-a26c52eb2079" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_0ae44961-0d14-4386-978c-a26c52eb2079_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_3af6553c-de80-42f2-9638-11d04eec6acb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_0ae44961-0d14-4386-978c-a26c52eb2079" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_3af6553c-de80-42f2-9638-11d04eec6acb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SeniorNotesAndResidualTrustCertificatesMember_764a473a-c213-43fe-8970-93bd1c475780" xlink:href="afrm-20250630.xsd#afrm_SeniorNotesAndResidualTrustCertificatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_3af6553c-de80-42f2-9638-11d04eec6acb" xlink:to="loc_afrm_SeniorNotesAndResidualTrustCertificatesMember_764a473a-c213-43fe-8970-93bd1c475780" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_f3bdebe3-775d-4a07-a76a-b7ca2dc87e70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_dd870436-5a3a-4e60-ba6a-fe42929a016c" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_f3bdebe3-775d-4a07-a76a-b7ca2dc87e70" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_cc471944-1926-496a-9da7-bea38b5575e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_f3bdebe3-775d-4a07-a76a-b7ca2dc87e70" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_cc471944-1926-496a-9da7-bea38b5575e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAdditions_2f05b9c3-6b7f-48c6-9abc-8d7a0fb2a4ef" xlink:href="afrm-20250630.xsd#afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_f3bdebe3-775d-4a07-a76a-b7ca2dc87e70" xlink:to="loc_afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAdditions_2f05b9c3-6b7f-48c6-9abc-8d7a0fb2a4ef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlementAndSales_e62588b8-48b3-4206-8824-30ad2417bf68" xlink:href="afrm-20250630.xsd#afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlementAndSales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_f3bdebe3-775d-4a07-a76a-b7ca2dc87e70" xlink:to="loc_afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlementAndSales_e62588b8-48b3-4206-8824-30ad2417bf68" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_206bb81f-78c6-4aae-a8a5-a94433407eb6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_f3bdebe3-775d-4a07-a76a-b7ca2dc87e70" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_206bb81f-78c6-4aae-a8a5-a94433407eb6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAccruedInterest_f04914c7-ce54-4ce1-a951-c802b5fa8040" xlink:href="afrm-20250630.xsd#afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_f3bdebe3-775d-4a07-a76a-b7ca2dc87e70" xlink:to="loc_afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAccruedInterest_f04914c7-ce54-4ce1-a951-c802b5fa8040" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityImpairmentOnSecuritiesAvailableForSale_5fbbff1d-6244-4eec-9b58-9ae5643ffbb2" xlink:href="afrm-20250630.xsd#afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityImpairmentOnSecuritiesAvailableForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_f3bdebe3-775d-4a07-a76a-b7ca2dc87e70" xlink:to="loc_afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityImpairmentOnSecuritiesAvailableForSale_5fbbff1d-6244-4eec-9b58-9ae5643ffbb2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_2171b4f3-4962-4029-b2d0-f4a896c51f2b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofQuantitativeInformationAboutSignificantUnobservableInputsforSeniorNotesandResidualTrustCertificatedDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesScheduleofQuantitativeInformationAboutSignificantUnobservableInputsforSeniorNotesandResidualTrustCertificatedDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofQuantitativeInformationAboutSignificantUnobservableInputsforSeniorNotesandResidualTrustCertificatedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_46d05c8d-db97-48fe-9440-5692d3f505ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_d5f0a425-802b-4c86-86c1-0966c33fc469" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_46d05c8d-db97-48fe-9440-5692d3f505ee" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_d5f0a425-802b-4c86-86c1-0966c33fc469" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_ac980fda-5129-492f-92e7-e15ec6717e46" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_d5f0a425-802b-4c86-86c1-0966c33fc469" xlink:to="loc_srt_RangeAxis_ac980fda-5129-492f-92e7-e15ec6717e46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ac980fda-5129-492f-92e7-e15ec6717e46_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_ac980fda-5129-492f-92e7-e15ec6717e46" xlink:to="loc_srt_RangeMember_ac980fda-5129-492f-92e7-e15ec6717e46_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_0e7db4d6-1f55-4870-aa69-f6d9b5760d70" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_ac980fda-5129-492f-92e7-e15ec6717e46" xlink:to="loc_srt_RangeMember_0e7db4d6-1f55-4870-aa69-f6d9b5760d70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_ad56acc7-ef71-4dd0-9e9e-cec0157e6224" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_0e7db4d6-1f55-4870-aa69-f6d9b5760d70" xlink:to="loc_srt_MinimumMember_ad56acc7-ef71-4dd0-9e9e-cec0157e6224" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_2d206e08-987b-4424-8a08-d5eeaa8184d0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_0e7db4d6-1f55-4870-aa69-f6d9b5760d70" xlink:to="loc_srt_MaximumMember_2d206e08-987b-4424-8a08-d5eeaa8184d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_3f476b30-e7e6-40c3-be3a-31aa1c4d40bb" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_0e7db4d6-1f55-4870-aa69-f6d9b5760d70" xlink:to="loc_srt_WeightedAverageMember_3f476b30-e7e6-40c3-be3a-31aa1c4d40bb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_484b19d2-e55a-46c7-bc28-433b46df3af7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_d5f0a425-802b-4c86-86c1-0966c33fc469" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_484b19d2-e55a-46c7-bc28-433b46df3af7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_484b19d2-e55a-46c7-bc28-433b46df3af7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_484b19d2-e55a-46c7-bc28-433b46df3af7" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_484b19d2-e55a-46c7-bc28-433b46df3af7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_5dc5ed86-75a1-4a18-851a-7589729398f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_484b19d2-e55a-46c7-bc28-433b46df3af7" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_5dc5ed86-75a1-4a18-851a-7589729398f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SeniorNotesAndResidualTrustCertificatesMember_98f8faef-7790-4c72-a197-7f51a0777e8b" xlink:href="afrm-20250630.xsd#afrm_SeniorNotesAndResidualTrustCertificatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_5dc5ed86-75a1-4a18-851a-7589729398f3" xlink:to="loc_afrm_SeniorNotesAndResidualTrustCertificatesMember_98f8faef-7790-4c72-a197-7f51a0777e8b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_277393da-2605-432c-be1b-994e8f17a8d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_d5f0a425-802b-4c86-86c1-0966c33fc469" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_277393da-2605-432c-be1b-994e8f17a8d7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_277393da-2605-432c-be1b-994e8f17a8d7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_277393da-2605-432c-be1b-994e8f17a8d7" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_277393da-2605-432c-be1b-994e8f17a8d7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_7f7c7871-fe81-453b-a6da-f50e18fff089" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_277393da-2605-432c-be1b-994e8f17a8d7" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_7f7c7871-fe81-453b-a6da-f50e18fff089" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_ec0b584a-4dcb-497b-be9e-38408975bff3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_7f7c7871-fe81-453b-a6da-f50e18fff089" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_ec0b584a-4dcb-497b-be9e-38408975bff3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDefaultRateMember_9c47ae60-ad7a-42b0-8bd6-21aadf371a9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDefaultRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_7f7c7871-fe81-453b-a6da-f50e18fff089" xlink:to="loc_us-gaap_MeasurementInputDefaultRateMember_9c47ae60-ad7a-42b0-8bd6-21aadf371a9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputPrepaymentRateMember_52571765-d361-43cc-ae5f-15752997c939" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputPrepaymentRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_7f7c7871-fe81-453b-a6da-f50e18fff089" xlink:to="loc_us-gaap_MeasurementInputPrepaymentRateMember_52571765-d361-43cc-ae5f-15752997c939" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ResidualTrustCertificatesMeasurementInput_9b9fe447-2b68-4c7a-8365-3900db68e293" xlink:href="afrm-20250630.xsd#afrm_ResidualTrustCertificatesMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_46d05c8d-db97-48fe-9440-5692d3f505ee" xlink:to="loc_afrm_ResidualTrustCertificatesMeasurementInput_9b9fe447-2b68-4c7a-8365-3900db68e293" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofAdverseChangesinEstimatesforSecuritizationNotesandResidualTrustCertificatesDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesScheduleofAdverseChangesinEstimatesforSecuritizationNotesandResidualTrustCertificatesDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofAdverseChangesinEstimatesforSecuritizationNotesandResidualTrustCertificatesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c9b8cd88-530c-45b8-b575-b5157de1426c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_b380e4c2-1e9c-414a-b326-f98a2e6c40dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c9b8cd88-530c-45b8-b575-b5157de1426c" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_b380e4c2-1e9c-414a-b326-f98a2e6c40dc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_848ca090-ceba-422b-8539-dc53846abc03" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_b380e4c2-1e9c-414a-b326-f98a2e6c40dc" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_848ca090-ceba-422b-8539-dc53846abc03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_848ca090-ceba-422b-8539-dc53846abc03_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_848ca090-ceba-422b-8539-dc53846abc03" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_848ca090-ceba-422b-8539-dc53846abc03_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_b87f3a02-873b-4222-9343-ca9ef229d9fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_848ca090-ceba-422b-8539-dc53846abc03" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_b87f3a02-873b-4222-9343-ca9ef229d9fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_928dcd08-1012-4ce5-80a9-3e592e147243" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_b87f3a02-873b-4222-9343-ca9ef229d9fe" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_928dcd08-1012-4ce5-80a9-3e592e147243" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDefaultRateMember_68b71f46-4b41-4ed6-bf83-f1e3992bfb85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDefaultRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_b87f3a02-873b-4222-9343-ca9ef229d9fe" xlink:to="loc_us-gaap_MeasurementInputDefaultRateMember_68b71f46-4b41-4ed6-bf83-f1e3992bfb85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputPrepaymentRateMember_142e81ae-3d8c-4123-8d91-f5626c7b1f30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputPrepaymentRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_b87f3a02-873b-4222-9343-ca9ef229d9fe" xlink:to="loc_us-gaap_MeasurementInputPrepaymentRateMember_142e81ae-3d8c-4123-8d91-f5626c7b1f30" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueSecuritizationNotesAndResidualTrustCertificatesLiabilityEffectOfTwentyFivePercentagePointIncreaseDecreaseInMeasurementInput_fd4fd5d9-640f-4893-b261-276e53b63b23" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueSecuritizationNotesAndResidualTrustCertificatesLiabilityEffectOfTwentyFivePercentagePointIncreaseDecreaseInMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c9b8cd88-530c-45b8-b575-b5157de1426c" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueSecuritizationNotesAndResidualTrustCertificatesLiabilityEffectOfTwentyFivePercentagePointIncreaseDecreaseInMeasurementInput_fd4fd5d9-640f-4893-b261-276e53b63b23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueSecuritizationNotesAndResidualTrustCertificatesLiabilityEffectOfFiftyPercentagePointIncreaseDecreaseInMeasurementInput_54ec3243-d711-4629-bc69-b971c927f3c7" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueSecuritizationNotesAndResidualTrustCertificatesLiabilityEffectOfFiftyPercentagePointIncreaseDecreaseInMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c9b8cd88-530c-45b8-b575-b5157de1426c" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueSecuritizationNotesAndResidualTrustCertificatesLiabilityEffectOfFiftyPercentagePointIncreaseDecreaseInMeasurementInput_54ec3243-d711-4629-bc69-b971c927f3c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueSecuritizationNotesAndResidualTrustCertificatesLiabilityChangeOfTwentyFivePercentagePointInMeasurementInput_c57d2628-0382-4d13-884d-cee2ebf58b59" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueSecuritizationNotesAndResidualTrustCertificatesLiabilityChangeOfTwentyFivePercentagePointInMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c9b8cd88-530c-45b8-b575-b5157de1426c" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueSecuritizationNotesAndResidualTrustCertificatesLiabilityChangeOfTwentyFivePercentagePointInMeasurementInput_c57d2628-0382-4d13-884d-cee2ebf58b59" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueSecuritizationNotesAndResidualTrustCertificatesLiabilityChangeOfFiftyPercentagePointInMeasurementInput_42cfc6f1-9e3e-4bf6-975d-52a2542bf0a6" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueSecuritizationNotesAndResidualTrustCertificatesLiabilityChangeOfFiftyPercentagePointInMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_c9b8cd88-530c-45b8-b575-b5157de1426c" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueSecuritizationNotesAndResidualTrustCertificatesLiabilityChangeOfFiftyPercentagePointInMeasurementInput_42cfc6f1-9e3e-4bf6-975d-52a2542bf0a6" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesFairValueActivityofResidualInterestsinStructuredTransactionsDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesFairValueActivityofResidualInterestsinStructuredTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesFairValueActivityofResidualInterestsinStructuredTransactionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_2c28afc8-726b-41b8-adf6-5fb9dbabb1e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_bd2a344f-dac6-432b-a1d2-cee03b485a2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_2c28afc8-726b-41b8-adf6-5fb9dbabb1e8" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_bd2a344f-dac6-432b-a1d2-cee03b485a2a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_c447b5d8-0e1b-417e-81a1-47fab5230f04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_bd2a344f-dac6-432b-a1d2-cee03b485a2a" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_c447b5d8-0e1b-417e-81a1-47fab5230f04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_c447b5d8-0e1b-417e-81a1-47fab5230f04_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_c447b5d8-0e1b-417e-81a1-47fab5230f04" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_c447b5d8-0e1b-417e-81a1-47fab5230f04_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_29858f6c-44b1-4342-b6ea-ef93d3530c68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_c447b5d8-0e1b-417e-81a1-47fab5230f04" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_29858f6c-44b1-4342-b6ea-ef93d3530c68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ResidualInterestsInStructuredTransactionsMember_da13360f-9b99-4aaf-b06a-a3bc5b09503d" xlink:href="afrm-20250630.xsd#afrm_ResidualInterestsInStructuredTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_29858f6c-44b1-4342-b6ea-ef93d3530c68" xlink:to="loc_afrm_ResidualInterestsInStructuredTransactionsMember_da13360f-9b99-4aaf-b06a-a3bc5b09503d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_9293db88-528c-4225-a4d5-20c9bc6d100f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_2c28afc8-726b-41b8-adf6-5fb9dbabb1e8" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_9293db88-528c-4225-a4d5-20c9bc6d100f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_9b237630-a3ee-41ee-8d9e-218b40df9fe6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_9293db88-528c-4225-a4d5-20c9bc6d100f" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_9b237630-a3ee-41ee-8d9e-218b40df9fe6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetCapitalContribution_15964d76-3fa8-4405-9f52-5aa1e8880211" xlink:href="afrm-20250630.xsd#afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetCapitalContribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_9293db88-528c-4225-a4d5-20c9bc6d100f" xlink:to="loc_afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetCapitalContribution_15964d76-3fa8-4405-9f52-5aa1e8880211" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_2d98884f-893e-436f-9e90-202ff82cc9a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_9293db88-528c-4225-a4d5-20c9bc6d100f" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_2d98884f-893e-436f-9e90-202ff82cc9a3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_a8a46f31-8944-4ba4-ab09-4a4660e00665" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesResidualInterestsinStructuredTransactionsSignificantUnobservableInputsDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesResidualInterestsinStructuredTransactionsSignificantUnobservableInputsDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesResidualInterestsinStructuredTransactionsSignificantUnobservableInputsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_ba2b870e-5f4d-437c-ae16-1784fd490a49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_a00f1df4-c955-4368-9f68-82f8a43a9ad3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_ba2b870e-5f4d-437c-ae16-1784fd490a49" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_a00f1df4-c955-4368-9f68-82f8a43a9ad3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_493d0cc4-9090-498b-afdb-bb613bbd8cb5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_a00f1df4-c955-4368-9f68-82f8a43a9ad3" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_493d0cc4-9090-498b-afdb-bb613bbd8cb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_493d0cc4-9090-498b-afdb-bb613bbd8cb5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_493d0cc4-9090-498b-afdb-bb613bbd8cb5" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_493d0cc4-9090-498b-afdb-bb613bbd8cb5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_eef9da21-6ffd-41d7-a312-464b1a2b0a9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_493d0cc4-9090-498b-afdb-bb613bbd8cb5" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_eef9da21-6ffd-41d7-a312-464b1a2b0a9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_6fefd236-6aed-47a9-b3b2-c9bcd32f4b45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_eef9da21-6ffd-41d7-a312-464b1a2b0a9c" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_6fefd236-6aed-47a9-b3b2-c9bcd32f4b45" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDefaultRateMember_d5d19795-9d8d-42df-a456-00dd9c7e673c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDefaultRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_eef9da21-6ffd-41d7-a312-464b1a2b0a9c" xlink:to="loc_us-gaap_MeasurementInputDefaultRateMember_d5d19795-9d8d-42df-a456-00dd9c7e673c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputPrepaymentRateMember_a0533bbd-6c6f-43b6-9c48-531142443b57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputPrepaymentRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_eef9da21-6ffd-41d7-a312-464b1a2b0a9c" xlink:to="loc_us-gaap_MeasurementInputPrepaymentRateMember_a0533bbd-6c6f-43b6-9c48-531142443b57" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ResidualInterestsInStructuredTransactionsMeasurementInput_b14df44d-a515-45f6-b108-d8f16a0da272" xlink:href="afrm-20250630.xsd#afrm_ResidualInterestsInStructuredTransactionsMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_ba2b870e-5f4d-437c-ae16-1784fd490a49" xlink:to="loc_afrm_ResidualInterestsInStructuredTransactionsMeasurementInput_b14df44d-a515-45f6-b108-d8f16a0da272" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesResidualInterestsinStructuredTransactionsEffectofHypotheticalAdverseChangesinSignificantInputsDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesResidualInterestsinStructuredTransactionsEffectofHypotheticalAdverseChangesinSignificantInputsDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesResidualInterestsinStructuredTransactionsEffectofHypotheticalAdverseChangesinSignificantInputsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_2029245a-0b0a-4e7d-800b-ac2baefe38e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_914cca38-b5bf-40c4-a3d8-e20cd39ca08d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_2029245a-0b0a-4e7d-800b-ac2baefe38e4" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_914cca38-b5bf-40c4-a3d8-e20cd39ca08d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_7ae747c1-187e-4aa8-a47f-dd3210e20794" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_914cca38-b5bf-40c4-a3d8-e20cd39ca08d" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_7ae747c1-187e-4aa8-a47f-dd3210e20794" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_7ae747c1-187e-4aa8-a47f-dd3210e20794_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_7ae747c1-187e-4aa8-a47f-dd3210e20794" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_7ae747c1-187e-4aa8-a47f-dd3210e20794_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_4867d9ab-0293-45ad-b233-d6f0368af11a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_7ae747c1-187e-4aa8-a47f-dd3210e20794" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_4867d9ab-0293-45ad-b233-d6f0368af11a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputPrepaymentRateMember_bf0974e2-b318-4280-8064-6d96b16b2b3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputPrepaymentRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_4867d9ab-0293-45ad-b233-d6f0368af11a" xlink:to="loc_us-gaap_MeasurementInputPrepaymentRateMember_bf0974e2-b318-4280-8064-6d96b16b2b3a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDefaultRateMember_f0072877-a7de-4590-94f3-f286dfdd0b44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDefaultRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_4867d9ab-0293-45ad-b233-d6f0368af11a" xlink:to="loc_us-gaap_MeasurementInputDefaultRateMember_f0072877-a7de-4590-94f3-f286dfdd0b44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_61da9e89-c467-44a9-aa8b-c3a46f021f9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_4867d9ab-0293-45ad-b233-d6f0368af11a" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_61da9e89-c467-44a9-aa8b-c3a46f021f9d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf20PercentAdverseChangeInPrepaymentSpeed_2f70c0e7-e8c4-451f-8753-bcaa7816a3d0" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf20PercentAdverseChangeInPrepaymentSpeed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_2029245a-0b0a-4e7d-800b-ac2baefe38e4" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf20PercentAdverseChangeInPrepaymentSpeed_2f70c0e7-e8c4-451f-8753-bcaa7816a3d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf40PercentAdverseChangeInPrepaymentSpeed_f0c157b9-88fe-4fbd-ac55-e35995ce836e" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf40PercentAdverseChangeInPrepaymentSpeed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_2029245a-0b0a-4e7d-800b-ac2baefe38e4" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf40PercentAdverseChangeInPrepaymentSpeed_f0c157b9-88fe-4fbd-ac55-e35995ce836e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf20PercentAdverseChangeInDefaultRate_bee0964c-665c-48ce-9984-1a8b4d863ca7" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf20PercentAdverseChangeInDefaultRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_2029245a-0b0a-4e7d-800b-ac2baefe38e4" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf20PercentAdverseChangeInDefaultRate_bee0964c-665c-48ce-9984-1a8b4d863ca7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf40PercentAdverseChangeInDefaultRate_5e1f4b49-9852-45f0-bccc-299def1e8ab2" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf40PercentAdverseChangeInDefaultRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_2029245a-0b0a-4e7d-800b-ac2baefe38e4" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf40PercentAdverseChangeInDefaultRate_5e1f4b49-9852-45f0-bccc-299def1e8ab2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf20PercentAdverseChangeInDiscountRate_417ffa53-eedc-4106-a76f-28d0a8bb82a6" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf20PercentAdverseChangeInDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_2029245a-0b0a-4e7d-800b-ac2baefe38e4" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf20PercentAdverseChangeInDiscountRate_417ffa53-eedc-4106-a76f-28d0a8bb82a6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf40PercentAdverseChangeInDiscountRate_b9db67b0-62f4-4614-932a-5f18de055479" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf40PercentAdverseChangeInDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_2029245a-0b0a-4e7d-800b-ac2baefe38e4" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueResidualInterestsInStructuredTransactionsImpactOf40PercentAdverseChangeInDiscountRate_b9db67b0-62f4-4614-932a-5f18de055479" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofFairValueofProfitShareLiabilityDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesScheduleofFairValueofProfitShareLiabilityDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofFairValueofProfitShareLiabilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_9f081191-0f65-4e33-86cb-8edd93978ec5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_ac442034-eece-4830-93ab-beb5babe2e5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_9f081191-0f65-4e33-86cb-8edd93978ec5" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_ac442034-eece-4830-93ab-beb5babe2e5f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_3c485e7b-807e-4b81-b9e1-b7468c4aa2b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_ac442034-eece-4830-93ab-beb5babe2e5f" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_3c485e7b-807e-4b81-b9e1-b7468c4aa2b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_3c485e7b-807e-4b81-b9e1-b7468c4aa2b1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_3c485e7b-807e-4b81-b9e1-b7468c4aa2b1" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_3c485e7b-807e-4b81-b9e1-b7468c4aa2b1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_c7c06eed-b25f-40ff-8189-9f38233259dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_3c485e7b-807e-4b81-b9e1-b7468c4aa2b1" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_c7c06eed-b25f-40ff-8189-9f38233259dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementProfitShareLiabilityMember_7af67a34-ad97-46c3-b214-ef7f184b14d7" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementProfitShareLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_c7c06eed-b25f-40ff-8189-9f38233259dd" xlink:to="loc_afrm_CommercialAgreementProfitShareLiabilityMember_7af67a34-ad97-46c3-b214-ef7f184b14d7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_e4ff42fb-66c2-4a9d-970b-e52662ec767b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_9f081191-0f65-4e33-86cb-8edd93978ec5" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_e4ff42fb-66c2-4a9d-970b-e52662ec767b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_cbebd71c-6d5e-4070-8637-d616af51e557" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_e4ff42fb-66c2-4a9d-970b-e52662ec767b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_cbebd71c-6d5e-4070-8637-d616af51e557" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityFacilitationOfLoans_49778fdf-5529-4071-9202-86866962d259" xlink:href="afrm-20250630.xsd#afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityFacilitationOfLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_e4ff42fb-66c2-4a9d-970b-e52662ec767b" xlink:to="loc_afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityFacilitationOfLoans_49778fdf-5529-4071-9202-86866962d259" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityActualGainLoss_1ade45c6-b9ed-4c3c-95b6-817e967ea648" xlink:href="afrm-20250630.xsd#afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityActualGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_e4ff42fb-66c2-4a9d-970b-e52662ec767b" xlink:to="loc_afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityActualGainLoss_1ade45c6-b9ed-4c3c-95b6-817e967ea648" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySubsequentChangesToFairValue_0dc2643a-d96d-4e63-885d-e27fe09cc992" xlink:href="afrm-20250630.xsd#afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySubsequentChangesToFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_e4ff42fb-66c2-4a9d-970b-e52662ec767b" xlink:to="loc_afrm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySubsequentChangesToFairValue_0dc2643a-d96d-4e63-885d-e27fe09cc992" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_bfe46c15-a679-4a26-af35-7ac64ddf581f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofQuantitativeInformationAboutSignificantUnobservableInputsforProfitShareLiabilityDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesScheduleofQuantitativeInformationAboutSignificantUnobservableInputsforProfitShareLiabilityDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofQuantitativeInformationAboutSignificantUnobservableInputsforProfitShareLiabilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_a74df57c-fd9e-4215-83fa-28946628ecf9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_bd2cdd05-8242-43e2-9667-b6a775af00f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_a74df57c-fd9e-4215-83fa-28946628ecf9" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_bd2cdd05-8242-43e2-9667-b6a775af00f0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_1f9c792d-e436-4dba-8186-77c9e0861aca" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_bd2cdd05-8242-43e2-9667-b6a775af00f0" xlink:to="loc_srt_RangeAxis_1f9c792d-e436-4dba-8186-77c9e0861aca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1f9c792d-e436-4dba-8186-77c9e0861aca_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_1f9c792d-e436-4dba-8186-77c9e0861aca" xlink:to="loc_srt_RangeMember_1f9c792d-e436-4dba-8186-77c9e0861aca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_bb0f9d8f-a692-405e-a53d-05861ceadbc0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_1f9c792d-e436-4dba-8186-77c9e0861aca" xlink:to="loc_srt_RangeMember_bb0f9d8f-a692-405e-a53d-05861ceadbc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_4fab949e-70ef-459a-be7b-62f58fb668c2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_bb0f9d8f-a692-405e-a53d-05861ceadbc0" xlink:to="loc_srt_MinimumMember_4fab949e-70ef-459a-be7b-62f58fb668c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_c9831213-3f08-4591-b8dc-cc5c8cc74ffe" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_bb0f9d8f-a692-405e-a53d-05861ceadbc0" xlink:to="loc_srt_MaximumMember_c9831213-3f08-4591-b8dc-cc5c8cc74ffe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_801097e5-7b2a-41f4-a391-689a0e269696" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_bb0f9d8f-a692-405e-a53d-05861ceadbc0" xlink:to="loc_srt_WeightedAverageMember_801097e5-7b2a-41f4-a391-689a0e269696" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_c81dc200-ab0b-40de-829a-c254309b3bda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_bd2cdd05-8242-43e2-9667-b6a775af00f0" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_c81dc200-ab0b-40de-829a-c254309b3bda" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_c81dc200-ab0b-40de-829a-c254309b3bda_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_c81dc200-ab0b-40de-829a-c254309b3bda" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_c81dc200-ab0b-40de-829a-c254309b3bda_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_4a42be2c-2c7d-4499-82e5-d9e9b4708114" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_c81dc200-ab0b-40de-829a-c254309b3bda" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_4a42be2c-2c7d-4499-82e5-d9e9b4708114" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_2d74eac8-0b48-4f0a-997e-53487e4db24b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_4a42be2c-2c7d-4499-82e5-d9e9b4708114" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_2d74eac8-0b48-4f0a-997e-53487e4db24b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_MeasurementInputProgramProfitabilityMember_db0fc0d9-5d81-4013-8119-7bfae2ff1d43" xlink:href="afrm-20250630.xsd#afrm_MeasurementInputProgramProfitabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_4a42be2c-2c7d-4499-82e5-d9e9b4708114" xlink:to="loc_afrm_MeasurementInputProgramProfitabilityMember_db0fc0d9-5d81-4013-8119-7bfae2ff1d43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_1b51eb3a-ef37-4c12-8cba-703ff7a6077f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_bd2cdd05-8242-43e2-9667-b6a775af00f0" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_1b51eb3a-ef37-4c12-8cba-703ff7a6077f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_1b51eb3a-ef37-4c12-8cba-703ff7a6077f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_1b51eb3a-ef37-4c12-8cba-703ff7a6077f" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_1b51eb3a-ef37-4c12-8cba-703ff7a6077f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_9d2932d4-26d3-479d-aa4c-d5339c71b780" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_1b51eb3a-ef37-4c12-8cba-703ff7a6077f" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_9d2932d4-26d3-479d-aa4c-d5339c71b780" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementProfitShareLiabilityMember_4c6c602b-bcf9-42d4-a9bf-9c6f3b332626" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementProfitShareLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_9d2932d4-26d3-479d-aa4c-d5339c71b780" xlink:to="loc_afrm_CommercialAgreementProfitShareLiabilityMember_4c6c602b-bcf9-42d4-a9bf-9c6f3b332626" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementProfitShareLiabilityMeasurementInput_91256ae3-d112-4134-96e0-fad3cf24d0e8" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementProfitShareLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_a74df57c-fd9e-4215-83fa-28946628ecf9" xlink:to="loc_afrm_CommercialAgreementProfitShareLiabilityMeasurementInput_91256ae3-d112-4134-96e0-fad3cf24d0e8" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofRiskSharingAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesScheduleofRiskSharingAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofRiskSharingAssetsandLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_3df80c5e-1534-4a7b-bfb6-b7a07a90352f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_d5aea433-58c2-4bc5-ae0e-e5000bcd41f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_3df80c5e-1534-4a7b-bfb6-b7a07a90352f" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_d5aea433-58c2-4bc5-ae0e-e5000bcd41f8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_a2675f43-26ef-4202-8d01-4fe4ee4b3cee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_d5aea433-58c2-4bc5-ae0e-e5000bcd41f8" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_a2675f43-26ef-4202-8d01-4fe4ee4b3cee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_a2675f43-26ef-4202-8d01-4fe4ee4b3cee_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_a2675f43-26ef-4202-8d01-4fe4ee4b3cee" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_a2675f43-26ef-4202-8d01-4fe4ee4b3cee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_9d23787c-d38d-46bc-b24f-9508ce866d8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_a2675f43-26ef-4202-8d01-4fe4ee4b3cee" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_9d23787c-d38d-46bc-b24f-9508ce866d8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RiskSharingArrangementMember_b960aed4-ae8e-485d-9da0-68300e331a8f" xlink:href="afrm-20250630.xsd#afrm_RiskSharingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_9d23787c-d38d-46bc-b24f-9508ce866d8a" xlink:to="loc_afrm_RiskSharingArrangementMember_b960aed4-ae8e-485d-9da0-68300e331a8f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_fa91f2d5-8bbc-4baa-af15-03bcb55f0234" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_d5aea433-58c2-4bc5-ae0e-e5000bcd41f8" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_fa91f2d5-8bbc-4baa-af15-03bcb55f0234" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_fa91f2d5-8bbc-4baa-af15-03bcb55f0234_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_fa91f2d5-8bbc-4baa-af15-03bcb55f0234" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_fa91f2d5-8bbc-4baa-af15-03bcb55f0234_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_635d3fd1-7156-41a8-8ba9-2d6015e97783" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_fa91f2d5-8bbc-4baa-af15-03bcb55f0234" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_635d3fd1-7156-41a8-8ba9-2d6015e97783" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RiskSharingArrangementMember_ebbb347e-5f3d-4145-b758-cb57e15906ce" xlink:href="afrm-20250630.xsd#afrm_RiskSharingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_635d3fd1-7156-41a8-8ba9-2d6015e97783" xlink:to="loc_afrm_RiskSharingArrangementMember_ebbb347e-5f3d-4145-b758-cb57e15906ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_44dda503-8d8a-43fd-ab94-135c235aa614" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_3df80c5e-1534-4a7b-bfb6-b7a07a90352f" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_44dda503-8d8a-43fd-ab94-135c235aa614" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_07556ba5-546b-469b-b10e-bcce16dac945" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_44dda503-8d8a-43fd-ab94-135c235aa614" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_07556ba5-546b-469b-b10e-bcce16dac945" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues_0a44ac69-e1e9-463c-8eda-19aa60c891c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_44dda503-8d8a-43fd-ab94-135c235aa614" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues_0a44ac69-e1e9-463c-8eda-19aa60c891c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_81826e70-e9cf-4a19-828a-73ec2b2459dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_44dda503-8d8a-43fd-ab94-135c235aa614" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_81826e70-e9cf-4a19-828a-73ec2b2459dd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_c51de018-d5ef-489c-9a92-376759b46814" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_44dda503-8d8a-43fd-ab94-135c235aa614" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_c51de018-d5ef-489c-9a92-376759b46814" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_44ea25ed-1e37-4014-b975-05ef6479c5e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_49c17099-e6d4-4886-a8ac-7a68ca703929" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_3df80c5e-1534-4a7b-bfb6-b7a07a90352f" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_49c17099-e6d4-4886-a8ac-7a68ca703929" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_2f740ea4-017d-42ed-8b1b-86267a3f8661" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_49c17099-e6d4-4886-a8ac-7a68ca703929" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_2f740ea4-017d-42ed-8b1b-86267a3f8661" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_8e30f9ec-d302-496f-a3d7-d27eadfa2e55" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_49c17099-e6d4-4886-a8ac-7a68ca703929" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_8e30f9ec-d302-496f-a3d7-d27eadfa2e55" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_c948abf0-e7da-4524-b3dc-19185503c972" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_49c17099-e6d4-4886-a8ac-7a68ca703929" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_c948abf0-e7da-4524-b3dc-19185503c972" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_b18d73de-572a-45b7-a08b-5c155a4cf5fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofQuantitativeInformationDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesScheduleofQuantitativeInformationDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofQuantitativeInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_dc4d7880-e26b-488a-874e-79080e1e18f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_0ca99e0b-4355-4f58-9dfb-2d57e61ff68c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_dc4d7880-e26b-488a-874e-79080e1e18f2" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_0ca99e0b-4355-4f58-9dfb-2d57e61ff68c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_7265950b-b704-4683-a432-7d957d3f4cac" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_0ca99e0b-4355-4f58-9dfb-2d57e61ff68c" xlink:to="loc_srt_RangeAxis_7265950b-b704-4683-a432-7d957d3f4cac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_7265950b-b704-4683-a432-7d957d3f4cac_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_7265950b-b704-4683-a432-7d957d3f4cac" xlink:to="loc_srt_RangeMember_7265950b-b704-4683-a432-7d957d3f4cac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_8397e4ee-58d5-4958-9944-5e94b1873172" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_7265950b-b704-4683-a432-7d957d3f4cac" xlink:to="loc_srt_RangeMember_8397e4ee-58d5-4958-9944-5e94b1873172" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_73ed934a-fa2a-4b70-ab1f-a1c1faa5e00b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_8397e4ee-58d5-4958-9944-5e94b1873172" xlink:to="loc_srt_MinimumMember_73ed934a-fa2a-4b70-ab1f-a1c1faa5e00b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_569e7b34-2698-4872-8bcc-a774eca2c3f5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_8397e4ee-58d5-4958-9944-5e94b1873172" xlink:to="loc_srt_MaximumMember_569e7b34-2698-4872-8bcc-a774eca2c3f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_0b611989-7aa0-4b10-a625-154a78ee984d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_8397e4ee-58d5-4958-9944-5e94b1873172" xlink:to="loc_srt_WeightedAverageMember_0b611989-7aa0-4b10-a625-154a78ee984d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_0e0d3da1-99f2-4065-a4a8-85ecd0f168ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_0ca99e0b-4355-4f58-9dfb-2d57e61ff68c" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_0e0d3da1-99f2-4065-a4a8-85ecd0f168ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_0e0d3da1-99f2-4065-a4a8-85ecd0f168ba_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_0e0d3da1-99f2-4065-a4a8-85ecd0f168ba" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_0e0d3da1-99f2-4065-a4a8-85ecd0f168ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_687e2f1c-1533-4bf8-b768-947ec248fd9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_0e0d3da1-99f2-4065-a4a8-85ecd0f168ba" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_687e2f1c-1533-4bf8-b768-947ec248fd9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RiskSharingArrangementMember_d7bf922f-320f-40d9-a88f-e3ead0fd3d6c" xlink:href="afrm-20250630.xsd#afrm_RiskSharingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_687e2f1c-1533-4bf8-b768-947ec248fd9b" xlink:to="loc_afrm_RiskSharingArrangementMember_d7bf922f-320f-40d9-a88f-e3ead0fd3d6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_b4b2ed1f-bcc1-4069-ab18-7b7add4e7f8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_0ca99e0b-4355-4f58-9dfb-2d57e61ff68c" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_b4b2ed1f-bcc1-4069-ab18-7b7add4e7f8a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_b4b2ed1f-bcc1-4069-ab18-7b7add4e7f8a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_b4b2ed1f-bcc1-4069-ab18-7b7add4e7f8a" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_b4b2ed1f-bcc1-4069-ab18-7b7add4e7f8a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_7102e1d5-966a-4dd0-b1b3-9fae0c5291c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_b4b2ed1f-bcc1-4069-ab18-7b7add4e7f8a" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_7102e1d5-966a-4dd0-b1b3-9fae0c5291c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_017c15f3-6920-473d-b7ed-57ad8369be1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_7102e1d5-966a-4dd0-b1b3-9fae0c5291c3" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_017c15f3-6920-473d-b7ed-57ad8369be1c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_MeasurementInputLossRateMember_ed5566f5-5c0a-4148-911f-ab6d05ca72a6" xlink:href="afrm-20250630.xsd#afrm_MeasurementInputLossRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_7102e1d5-966a-4dd0-b1b3-9fae0c5291c3" xlink:to="loc_afrm_MeasurementInputLossRateMember_ed5566f5-5c0a-4148-911f-ab6d05ca72a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputPrepaymentRateMember_6cecf635-2925-464a-a36c-66c8dfceb349" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputPrepaymentRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_7102e1d5-966a-4dd0-b1b3-9fae0c5291c3" xlink:to="loc_us-gaap_MeasurementInputPrepaymentRateMember_6cecf635-2925-464a-a36c-66c8dfceb349" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_de5c2c16-fbc0-41f1-bedf-9a819ef433c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_0ca99e0b-4355-4f58-9dfb-2d57e61ff68c" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_de5c2c16-fbc0-41f1-bedf-9a819ef433c7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_de5c2c16-fbc0-41f1-bedf-9a819ef433c7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_de5c2c16-fbc0-41f1-bedf-9a819ef433c7" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_de5c2c16-fbc0-41f1-bedf-9a819ef433c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_0a4430ba-32ec-4c19-8351-895d6f776d0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_de5c2c16-fbc0-41f1-bedf-9a819ef433c7" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_0a4430ba-32ec-4c19-8351-895d6f776d0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RiskSharingArrangementMember_8d04a967-f1df-4aea-a23a-29ea2a114abd" xlink:href="afrm-20250630.xsd#afrm_RiskSharingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_0a4430ba-32ec-4c19-8351-895d6f776d0c" xlink:to="loc_afrm_RiskSharingArrangementMember_8d04a967-f1df-4aea-a23a-29ea2a114abd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetMeasurementInput_0252de99-aac5-4a57-8e82-fbf38cc5ba54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_dc4d7880-e26b-488a-874e-79080e1e18f2" xlink:to="loc_us-gaap_DerivativeAssetMeasurementInput_0252de99-aac5-4a57-8e82-fbf38cc5ba54" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityMeasurementInput_fffad776-9727-4238-a6f0-ab184bc24888" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_dc4d7880-e26b-488a-874e-79080e1e18f2" xlink:to="loc_us-gaap_DerivativeLiabilityMeasurementInput_fffad776-9727-4238-a6f0-ab184bc24888" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleoftheFairValueoftheRiskSharingAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesScheduleoftheFairValueoftheRiskSharingAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleoftheFairValueoftheRiskSharingAssetsandLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ba94db59-65d0-461b-93b8-311b23afd94d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_10266d01-830b-484b-9aef-1805954b53fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ba94db59-65d0-461b-93b8-311b23afd94d" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_10266d01-830b-484b-9aef-1805954b53fd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_9ce26ce7-ad9a-43db-9460-ee3f6755ac16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_10266d01-830b-484b-9aef-1805954b53fd" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_9ce26ce7-ad9a-43db-9460-ee3f6755ac16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_9ce26ce7-ad9a-43db-9460-ee3f6755ac16_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_9ce26ce7-ad9a-43db-9460-ee3f6755ac16" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_9ce26ce7-ad9a-43db-9460-ee3f6755ac16_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_dbb6e34f-3955-4275-8691-5f3cf005378c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_9ce26ce7-ad9a-43db-9460-ee3f6755ac16" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_dbb6e34f-3955-4275-8691-5f3cf005378c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RiskSharingArrangementMember_7ad3f8ce-6f56-4df0-9dfb-a47f625b15f9" xlink:href="afrm-20250630.xsd#afrm_RiskSharingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_dbb6e34f-3955-4275-8691-5f3cf005378c" xlink:to="loc_afrm_RiskSharingArrangementMember_7ad3f8ce-6f56-4df0-9dfb-a47f625b15f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_ed9d66f7-3237-4e0c-85e6-875747a72cd7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_10266d01-830b-484b-9aef-1805954b53fd" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_ed9d66f7-3237-4e0c-85e6-875747a72cd7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_ed9d66f7-3237-4e0c-85e6-875747a72cd7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_ed9d66f7-3237-4e0c-85e6-875747a72cd7" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_ed9d66f7-3237-4e0c-85e6-875747a72cd7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_f5432abf-885e-4d45-842a-f225ac5d49dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_ed9d66f7-3237-4e0c-85e6-875747a72cd7" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_f5432abf-885e-4d45-842a-f225ac5d49dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RiskSharingArrangementMember_6ca51df1-f1ea-4b47-9e26-e53899d894f6" xlink:href="afrm-20250630.xsd#afrm_RiskSharingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_f5432abf-885e-4d45-842a-f225ac5d49dc" xlink:to="loc_afrm_RiskSharingArrangementMember_6ca51df1-f1ea-4b47-9e26-e53899d894f6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf25PercentDecreaseChangeInPrepaymentSpeed_63453b88-433d-45f9-9afe-5f3060e48f05" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf25PercentDecreaseChangeInPrepaymentSpeed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ba94db59-65d0-461b-93b8-311b23afd94d" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf25PercentDecreaseChangeInPrepaymentSpeed_63453b88-433d-45f9-9afe-5f3060e48f05" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf50PercentDecreaseChangeInPrepaymentSpeed_80a3b9cc-db35-4a45-912c-0d17fbb4642e" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf50PercentDecreaseChangeInPrepaymentSpeed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ba94db59-65d0-461b-93b8-311b23afd94d" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf50PercentDecreaseChangeInPrepaymentSpeed_80a3b9cc-db35-4a45-912c-0d17fbb4642e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf25PercentAdverseChangeInPrepaymentSpeed_d2c60776-1de3-4044-aa10-622ae8734c3a" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf25PercentAdverseChangeInPrepaymentSpeed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ba94db59-65d0-461b-93b8-311b23afd94d" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf25PercentAdverseChangeInPrepaymentSpeed_d2c60776-1de3-4044-aa10-622ae8734c3a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf50PercentAdverseChangeInPrepaymentSpeed_f93dc5b4-7f1c-4a60-aa45-c150ffddbe1f" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf50PercentAdverseChangeInPrepaymentSpeed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ba94db59-65d0-461b-93b8-311b23afd94d" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf50PercentAdverseChangeInPrepaymentSpeed_f93dc5b4-7f1c-4a60-aa45-c150ffddbe1f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf25PercentAdverseChangeInLossRate_a8b0aab0-24b3-4028-96c5-fe6681b9c84f" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf25PercentAdverseChangeInLossRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ba94db59-65d0-461b-93b8-311b23afd94d" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf25PercentAdverseChangeInLossRate_a8b0aab0-24b3-4028-96c5-fe6681b9c84f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf50PercentAdverseChangeInLossRate_8d27f3e1-18b3-4651-b9fb-f6f59a9100d3" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf50PercentAdverseChangeInLossRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ba94db59-65d0-461b-93b8-311b23afd94d" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf50PercentAdverseChangeInLossRate_8d27f3e1-18b3-4651-b9fb-f6f59a9100d3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf25PercentAdverseChangeInDiscountRate_c5a03055-a479-4d18-bb67-91c1bbc9166a" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf25PercentAdverseChangeInDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ba94db59-65d0-461b-93b8-311b23afd94d" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf25PercentAdverseChangeInDiscountRate_c5a03055-a479-4d18-bb67-91c1bbc9166a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf50PercentAdverseChangeInDiscountRate_83ae54bf-18cc-411c-8065-eb227c6a1cbc" xlink:href="afrm-20250630.xsd#afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf50PercentAdverseChangeInDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ba94db59-65d0-461b-93b8-311b23afd94d" xlink:to="loc_afrm_SensitivityAnalysisOfFairValueRiskSharingArrangementImpactOf50PercentAdverseChangeInDiscountRate_83ae54bf-18cc-411c-8065-eb227c6a1cbc" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofFairValueHierarchyforFinancialAssetsandLiabilitiesNotRecordedatFairValueDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#FairValueofFinancialAssetsandLiabilitiesScheduleofFairValueHierarchyforFinancialAssetsandLiabilitiesNotRecordedatFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/FairValueofFinancialAssetsandLiabilitiesScheduleofFairValueHierarchyforFinancialAssetsandLiabilitiesNotRecordedatFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_f06518be-fcdc-4159-baee-8f6b771ba306" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_f87d8482-d806-48da-a4c7-939b4b9559a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_f06518be-fcdc-4159-baee-8f6b771ba306" xlink:to="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_f87d8482-d806-48da-a4c7-939b4b9559a4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_7ca471df-1be3-400a-a2a7-2a27f7aa7439" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_f87d8482-d806-48da-a4c7-939b4b9559a4" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_7ca471df-1be3-400a-a2a7-2a27f7aa7439" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_7ca471df-1be3-400a-a2a7-2a27f7aa7439_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_7ca471df-1be3-400a-a2a7-2a27f7aa7439" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_7ca471df-1be3-400a-a2a7-2a27f7aa7439_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_d783639e-5d18-4385-bdbf-bbee25b25834" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_7ca471df-1be3-400a-a2a7-2a27f7aa7439" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_d783639e-5d18-4385-bdbf-bbee25b25834" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_1d09ea34-a9a9-4554-95a6-b7181b7a45f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_d783639e-5d18-4385-bdbf-bbee25b25834" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_1d09ea34-a9a9-4554-95a6-b7181b7a45f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_221559a0-8984-4773-94aa-bb865de6a979" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_1d09ea34-a9a9-4554-95a6-b7181b7a45f9" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_221559a0-8984-4773-94aa-bb865de6a979" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_172b5f06-d3b6-4958-9ae5-9a0b46dfd689" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_1d09ea34-a9a9-4554-95a6-b7181b7a45f9" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_172b5f06-d3b6-4958-9ae5-9a0b46dfd689" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_422821c1-de8b-4d26-ad97-5d01f6203e0f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_f87d8482-d806-48da-a4c7-939b4b9559a4" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_422821c1-de8b-4d26-ad97-5d01f6203e0f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_422821c1-de8b-4d26-ad97-5d01f6203e0f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_422821c1-de8b-4d26-ad97-5d01f6203e0f" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_422821c1-de8b-4d26-ad97-5d01f6203e0f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4b422053-67ab-4493-8bae-0d575fa49023" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_422821c1-de8b-4d26-ad97-5d01f6203e0f" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4b422053-67ab-4493-8bae-0d575fa49023" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_b87a2e21-8911-434f-8333-9790d81ff7a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4b422053-67ab-4493-8bae-0d575fa49023" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_b87a2e21-8911-434f-8333-9790d81ff7a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_9eebb898-3c7c-48ef-aa03-5cf0f81c6051" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4b422053-67ab-4493-8bae-0d575fa49023" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_9eebb898-3c7c-48ef-aa03-5cf0f81c6051" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_31272dc4-16f2-42d9-baf3-fd0e7fea338b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4b422053-67ab-4493-8bae-0d575fa49023" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_31272dc4-16f2-42d9-baf3-fd0e7fea338b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_06cbfceb-90e8-4406-8f9d-c2c74c0fcda5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_f87d8482-d806-48da-a4c7-939b4b9559a4" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_06cbfceb-90e8-4406-8f9d-c2c74c0fcda5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_06cbfceb-90e8-4406-8f9d-c2c74c0fcda5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_06cbfceb-90e8-4406-8f9d-c2c74c0fcda5" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_06cbfceb-90e8-4406-8f9d-c2c74c0fcda5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_434af3e2-44de-4a56-be12-7858dfa71083" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_06cbfceb-90e8-4406-8f9d-c2c74c0fcda5" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_434af3e2-44de-4a56-be12-7858dfa71083" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_bb595adf-9aeb-456b-add2-35ae46eb48dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_434af3e2-44de-4a56-be12-7858dfa71083" xlink:to="loc_us-gaap_LineOfCreditMember_bb595adf-9aeb-456b-add2-35ae46eb48dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_cb734dfd-3cba-4e85-82b5-640871baad25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_f87d8482-d806-48da-a4c7-939b4b9559a4" xlink:to="loc_us-gaap_DebtInstrumentAxis_cb734dfd-3cba-4e85-82b5-640871baad25" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_cb734dfd-3cba-4e85-82b5-640871baad25_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_cb734dfd-3cba-4e85-82b5-640871baad25" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_cb734dfd-3cba-4e85-82b5-640871baad25_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_0ba44de2-def7-4a07-9116-6927e85d4147" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_cb734dfd-3cba-4e85-82b5-640871baad25" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_0ba44de2-def7-4a07-9116-6927e85d4147" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ConvertibleSeniorNotesDue2026Member_a461e330-d83d-4394-ac11-ed118a43f697" xlink:href="afrm-20250630.xsd#afrm_ConvertibleSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0ba44de2-def7-4a07-9116-6927e85d4147" xlink:to="loc_afrm_ConvertibleSeniorNotesDue2026Member_a461e330-d83d-4394-ac11-ed118a43f697" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ConvertibleSeniorNotesDue2029Member_fdc38256-d676-45cc-a637-02596fb8a979" xlink:href="afrm-20250630.xsd#afrm_ConvertibleSeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0ba44de2-def7-4a07-9116-6927e85d4147" xlink:to="loc_afrm_ConvertibleSeniorNotesDue2029Member_fdc38256-d676-45cc-a637-02596fb8a979" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableHeldForSaleFairValueDisclosure_d3a9ba91-939a-4e20-97d3-ddff3d00bbfd" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableHeldForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_f06518be-fcdc-4159-baee-8f6b771ba306" xlink:to="loc_afrm_FinancingReceivableHeldForSaleFairValueDisclosure_d3a9ba91-939a-4e20-97d3-ddff3d00bbfd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_FinancingReceivableFairValueDisclosure_162eab3a-86a6-4c64-96e9-c0a5c249952c" xlink:href="afrm-20250630.xsd#afrm_FinancingReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_f06518be-fcdc-4159-baee-8f6b771ba306" xlink:to="loc_afrm_FinancingReceivableFairValueDisclosure_162eab3a-86a6-4c64-96e9-c0a5c249952c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsFairValueDisclosure_d7586d32-f6ec-41cc-985a-dd3f18f7bbb5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_f06518be-fcdc-4159-baee-8f6b771ba306" xlink:to="loc_us-gaap_OtherAssetsFairValueDisclosure_d7586d32-f6ec-41cc-985a-dd3f18f7bbb5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_5ec5d7b7-6992-4030-9e38-92d118147783" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_f06518be-fcdc-4159-baee-8f6b771ba306" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_5ec5d7b7-6992-4030-9e38-92d118147783" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtFairValueDisclosures_9e9b570e-29d2-4717-ac2d-d475782c32d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertibleDebtFairValueDisclosures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_f06518be-fcdc-4159-baee-8f6b771ba306" xlink:to="loc_us-gaap_ConvertibleDebtFairValueDisclosures_9e9b570e-29d2-4717-ac2d-d475782c32d6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableFairValueDisclosure_b1600539-9a32-4a04-92cb-822f4f877dd8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesPayableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_f06518be-fcdc-4159-baee-8f6b771ba306" xlink:to="loc_us-gaap_NotesPayableFairValueDisclosure_b1600539-9a32-4a04-92cb-822f4f877dd8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LinesOfCreditFairValueDisclosure_393b2c77-d98b-4b7f-97eb-c086d6bfe315" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LinesOfCreditFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_f06518be-fcdc-4159-baee-8f6b771ba306" xlink:to="loc_us-gaap_LinesOfCreditFairValueDisclosure_393b2c77-d98b-4b7f-97eb-c086d6bfe315" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_a8deb148-8714-4cf5-a00a-1e617bbe86d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_f06518be-fcdc-4159-baee-8f6b771ba306" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_a8deb148-8714-4cf5-a00a-1e617bbe86d4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_4bfbcac2-cc97-4f94-a984-a8b9d95ba232" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_f06518be-fcdc-4159-baee-8f6b771ba306" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_4bfbcac2-cc97-4f94-a984-a8b9d95ba232" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/StockholdersEquityScheduleofCommonStockReservedforFutureIssuanceDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#StockholdersEquityScheduleofCommonStockReservedforFutureIssuanceDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/StockholdersEquityScheduleofCommonStockReservedforFutureIssuanceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_30ae961a-c754-49dd-be9c-8c16ecb6e73c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_d4e0fa5e-9293-418e-9e67-446102a9ad31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_30ae961a-c754-49dd-be9c-8c16ecb6e73c" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_d4e0fa5e-9293-418e-9e67-446102a9ad31" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_af7739a9-7b27-4686-b98d-0a47d5c5bb2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_d4e0fa5e-9293-418e-9e67-446102a9ad31" xlink:to="loc_us-gaap_AwardTypeAxis_af7739a9-7b27-4686-b98d-0a47d5c5bb2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_af7739a9-7b27-4686-b98d-0a47d5c5bb2c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_af7739a9-7b27-4686-b98d-0a47d5c5bb2c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_af7739a9-7b27-4686-b98d-0a47d5c5bb2c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e6e80ca1-4141-4e7d-a50c-30a41c84233f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_af7739a9-7b27-4686-b98d-0a47d5c5bb2c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e6e80ca1-4141-4e7d-a50c-30a41c84233f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_f2028a7d-6d7e-4ab1-9d57-712dafaf4b43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e6e80ca1-4141-4e7d-a50c-30a41c84233f" xlink:to="loc_us-gaap_EmployeeStockOptionMember_f2028a7d-6d7e-4ab1-9d57-712dafaf4b43" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ShareBasedPaymentAgreementOptionFutureGrantMember_c3bd4832-adea-4ced-b50b-ac30479c2c15" xlink:href="afrm-20250630.xsd#afrm_ShareBasedPaymentAgreementOptionFutureGrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e6e80ca1-4141-4e7d-a50c-30a41c84233f" xlink:to="loc_afrm_ShareBasedPaymentAgreementOptionFutureGrantMember_c3bd4832-adea-4ced-b50b-ac30479c2c15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_6f9c051d-250c-4091-9090-3828a2ecb662" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_30ae961a-c754-49dd-be9c-8c16ecb6e73c" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_6f9c051d-250c-4091-9090-3828a2ecb662" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/StockholdersEquityAdditionalInformationDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#StockholdersEquityAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/StockholdersEquityAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_340adb9a-30d3-4013-b820-41dc20fa8ceb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_340adb9a-30d3-4013-b820-41dc20fa8ceb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_62791dfd-4f3d-440f-8a82-434b5bd729a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_340adb9a-30d3-4013-b820-41dc20fa8ceb" xlink:to="loc_us-gaap_StatementClassOfStockAxis_62791dfd-4f3d-440f-8a82-434b5bd729a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_62791dfd-4f3d-440f-8a82-434b5bd729a1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_62791dfd-4f3d-440f-8a82-434b5bd729a1" xlink:to="loc_us-gaap_ClassOfStockDomain_62791dfd-4f3d-440f-8a82-434b5bd729a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_03a38b61-2104-454a-a63c-e88a819a3493" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_62791dfd-4f3d-440f-8a82-434b5bd729a1" xlink:to="loc_us-gaap_ClassOfStockDomain_03a38b61-2104-454a-a63c-e88a819a3493" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_04fdac21-0c6d-4598-9bd0-cc3e437c2cfd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_03a38b61-2104-454a-a63c-e88a819a3493" xlink:to="loc_us-gaap_CommonClassAMember_04fdac21-0c6d-4598-9bd0-cc3e437c2cfd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_b309fdfa-e5aa-4d66-a119-ebb3a9271e89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_03a38b61-2104-454a-a63c-e88a819a3493" xlink:to="loc_us-gaap_CommonClassBMember_b309fdfa-e5aa-4d66-a119-ebb3a9271e89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_bc22bed3-2c76-4709-adfd-570fca9c2d5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_340adb9a-30d3-4013-b820-41dc20fa8ceb" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_bc22bed3-2c76-4709-adfd-570fca9c2d5c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_bc22bed3-2c76-4709-adfd-570fca9c2d5c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_bc22bed3-2c76-4709-adfd-570fca9c2d5c" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_bc22bed3-2c76-4709-adfd-570fca9c2d5c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_a82f633c-a72a-4777-8197-ff40a9052215" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_bc22bed3-2c76-4709-adfd-570fca9c2d5c" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_a82f633c-a72a-4777-8197-ff40a9052215" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementWithAmazonWarrantsMember_7d2d5ae0-d097-4673-a1b3-5ce48f4f5a9b" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementWithAmazonWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_a82f633c-a72a-4777-8197-ff40a9052215" xlink:to="loc_afrm_CommercialAgreementWithAmazonWarrantsMember_7d2d5ae0-d097-4673-a1b3-5ce48f4f5a9b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementWithAmazon0.01WarrantsMember_c4064df1-e070-408d-a037-c3f692389850" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementWithAmazon0.01WarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_a82f633c-a72a-4777-8197-ff40a9052215" xlink:to="loc_afrm_CommercialAgreementWithAmazon0.01WarrantsMember_c4064df1-e070-408d-a037-c3f692389850" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommercialAgreementWithAmazon100WarrantsMember_8553c7bb-390a-438d-8df5-a8212a5b48bc" xlink:href="afrm-20250630.xsd#afrm_CommercialAgreementWithAmazon100WarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_a82f633c-a72a-4777-8197-ff40a9052215" xlink:to="loc_afrm_CommercialAgreementWithAmazon100WarrantsMember_8553c7bb-390a-438d-8df5-a8212a5b48bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_NumberOfClassesOfCommonStock_31bfef1f-1b8d-48b6-b598-5d08af3469b6" xlink:href="afrm-20250630.xsd#afrm_NumberOfClassesOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_afrm_NumberOfClassesOfCommonStock_31bfef1f-1b8d-48b6-b598-5d08af3469b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommonStockVotingRightsNumberOfVotesPerShare_bd3bd561-03d4-4756-a070-e3c99dd7bdec" xlink:href="afrm-20250630.xsd#afrm_CommonStockVotingRightsNumberOfVotesPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_afrm_CommonStockVotingRightsNumberOfVotesPerShare_bd3bd561-03d4-4756-a070-e3c99dd7bdec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_CommonStockConversionRatio_b74fa210-2055-4913-856c-0b36134529d5" xlink:href="afrm-20250630.xsd#afrm_CommonStockConversionRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_afrm_CommonStockConversionRatio_b74fa210-2055-4913-856c-0b36134529d5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_f6b50c28-b64e-4c8b-b515-7261c42d4317" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_f6b50c28-b64e-4c8b-b515-7261c42d4317" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_2b9033e8-051a-4b24-9714-7f31c92db07b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_2b9033e8-051a-4b24-9714-7f31c92db07b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantsAndRightsOutstandingTerm_a5053207-dd83-47eb-85dc-b490d10a7308" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WarrantsAndRightsOutstandingTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_us-gaap_WarrantsAndRightsOutstandingTerm_a5053207-dd83-47eb-85dc-b490d10a7308" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ClassOfWarrantOrRightExercised_4aa29d8e-3fd3-493b-b01c-311cdab78fd5" xlink:href="afrm-20250630.xsd#afrm_ClassOfWarrantOrRightExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_afrm_ClassOfWarrantOrRightExercised_4aa29d8e-3fd3-493b-b01c-311cdab78fd5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ClassOfWarrantsOrRightsExtensionTerm_4ee6de3d-73f4-42bc-983f-c1a12a0d855f" xlink:href="afrm-20250630.xsd#afrm_ClassOfWarrantsOrRightsExtensionTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_afrm_ClassOfWarrantsOrRightsExtensionTerm_4ee6de3d-73f4-42bc-983f-c1a12a0d855f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ClassOrWarrantsOrRightsSaleOrWarrantsRecognized_bf032c7b-0753-4c06-af8d-46629c597745" xlink:href="afrm-20250630.xsd#afrm_ClassOrWarrantsOrRightsSaleOrWarrantsRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_afrm_ClassOrWarrantsOrRightsSaleOrWarrantsRecognized_bf032c7b-0753-4c06-af8d-46629c597745" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ClassOfWarrantsOrRightsAmortizationExpense_f2d223e6-e546-4337-bdb6-1b484c1b247f" xlink:href="afrm-20250630.xsd#afrm_ClassOfWarrantsOrRightsAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_afrm_ClassOfWarrantsOrRightsAmortizationExpense_f2d223e6-e546-4337-bdb6-1b484c1b247f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ClassOfWarrantsOrRightsExpensesOnGrantDateFairValueOnSaleOfWarrants_098388c9-e4b0-49d4-8814-1398aba8d286" xlink:href="afrm-20250630.xsd#afrm_ClassOfWarrantsOrRightsExpensesOnGrantDateFairValueOnSaleOfWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_afrm_ClassOfWarrantsOrRightsExpensesOnGrantDateFairValueOnSaleOfWarrants_098388c9-e4b0-49d4-8814-1398aba8d286" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_83ecacb5-d4a4-4eb3-a4a0-eb0537467c5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_83ecacb5-d4a4-4eb3-a4a0-eb0537467c5f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_31e19d2b-f95e-43ae-b5b3-c08aede318eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_31e19d2b-f95e-43ae-b5b3-c08aede318eb" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ClassOfWarrantOrRightSharesWarrantsGranted_ab86f7b5-8de2-489a-805e-7c455578a334" xlink:href="afrm-20250630.xsd#afrm_ClassOfWarrantOrRightSharesWarrantsGranted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_afrm_ClassOfWarrantOrRightSharesWarrantsGranted_ab86f7b5-8de2-489a-805e-7c455578a334" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ClassOfWarrantOrRightOutstandingWeightedAverageGrantDateFairValue_9429c0ca-2d66-4449-8694-746803f757e6" xlink:href="afrm-20250630.xsd#afrm_ClassOfWarrantOrRightOutstandingWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_afrm_ClassOfWarrantOrRightOutstandingWeightedAverageGrantDateFairValue_9429c0ca-2d66-4449-8694-746803f757e6" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ClassOfWarrantOrRightExercisableWeightedAverageGrantDateFairValue_2e8ebbab-9a1f-4401-9396-31d159a6ddfe" xlink:href="afrm-20250630.xsd#afrm_ClassOfWarrantOrRightExercisableWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_afrm_ClassOfWarrantOrRightExercisableWeightedAverageGrantDateFairValue_2e8ebbab-9a1f-4401-9396-31d159a6ddfe" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_868b2f4d-159e-47d1-9dd8-0a7bcd02bf23" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_868b2f4d-159e-47d1-9dd8-0a7bcd02bf23" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_9427443b-d285-4670-a5c3-0e045e7449cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_9427443b-d285-4670-a5c3-0e045e7449cd" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_2ef9c0d3-6c2c-49e8-b825-aedd45b7b253" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_cec70621-27be-49bc-8ea0-15598e3e4797" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_2ef9c0d3-6c2c-49e8-b825-aedd45b7b253" xlink:type="arc" order="18"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/EquityIncentivePlansAdditionalInformationDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#EquityIncentivePlansAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/EquityIncentivePlansAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d6ca62c3-dd38-4447-89ee-37deecb54da3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d6ca62c3-dd38-4447-89ee-37deecb54da3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_474286a8-a386-4cd7-a46a-25bfe13a6957" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d6ca62c3-dd38-4447-89ee-37deecb54da3" xlink:to="loc_us-gaap_PlanNameAxis_474286a8-a386-4cd7-a46a-25bfe13a6957" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_474286a8-a386-4cd7-a46a-25bfe13a6957_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_474286a8-a386-4cd7-a46a-25bfe13a6957" xlink:to="loc_us-gaap_PlanNameDomain_474286a8-a386-4cd7-a46a-25bfe13a6957_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_050c0bfa-39fd-4266-b995-7fa217b0234e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_474286a8-a386-4cd7-a46a-25bfe13a6957" xlink:to="loc_us-gaap_PlanNameDomain_050c0bfa-39fd-4266-b995-7fa217b0234e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_AmendedAndRestated2012StockPlanMember_224d6ccc-4500-4782-9dc6-6d26a945d81c" xlink:href="afrm-20250630.xsd#afrm_AmendedAndRestated2012StockPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_050c0bfa-39fd-4266-b995-7fa217b0234e" xlink:to="loc_afrm_AmendedAndRestated2012StockPlanMember_224d6ccc-4500-4782-9dc6-6d26a945d81c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_A2020EmployeeStockPurchasePlanMember_60f9bf35-c901-4212-9599-4b319173c5b0" xlink:href="afrm-20250630.xsd#afrm_A2020EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_050c0bfa-39fd-4266-b995-7fa217b0234e" xlink:to="loc_afrm_A2020EmployeeStockPurchasePlanMember_60f9bf35-c901-4212-9599-4b319173c5b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_028ae902-ebb4-47b3-bd0c-a7318c3404ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d6ca62c3-dd38-4447-89ee-37deecb54da3" xlink:to="loc_us-gaap_StatementClassOfStockAxis_028ae902-ebb4-47b3-bd0c-a7318c3404ca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_028ae902-ebb4-47b3-bd0c-a7318c3404ca_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_028ae902-ebb4-47b3-bd0c-a7318c3404ca" xlink:to="loc_us-gaap_ClassOfStockDomain_028ae902-ebb4-47b3-bd0c-a7318c3404ca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_53099711-251a-414c-88c3-92b6e49d8025" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_028ae902-ebb4-47b3-bd0c-a7318c3404ca" xlink:to="loc_us-gaap_ClassOfStockDomain_53099711-251a-414c-88c3-92b6e49d8025" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_6fbc3376-0db9-44f3-bb00-73fd73c05c9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_53099711-251a-414c-88c3-92b6e49d8025" xlink:to="loc_us-gaap_CommonClassAMember_6fbc3376-0db9-44f3-bb00-73fd73c05c9d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_44acb1df-063e-44d7-b5ea-d037381e94ee" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d6ca62c3-dd38-4447-89ee-37deecb54da3" xlink:to="loc_srt_RangeAxis_44acb1df-063e-44d7-b5ea-d037381e94ee" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_44acb1df-063e-44d7-b5ea-d037381e94ee_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_44acb1df-063e-44d7-b5ea-d037381e94ee" xlink:to="loc_srt_RangeMember_44acb1df-063e-44d7-b5ea-d037381e94ee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_222c442a-0632-4cce-a5d8-0a09fd3b8df9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_44acb1df-063e-44d7-b5ea-d037381e94ee" xlink:to="loc_srt_RangeMember_222c442a-0632-4cce-a5d8-0a09fd3b8df9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_21d9c29c-2867-4bdf-9738-54c402258e9a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_222c442a-0632-4cce-a5d8-0a09fd3b8df9" xlink:to="loc_srt_MinimumMember_21d9c29c-2867-4bdf-9738-54c402258e9a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_af706651-ec52-445b-944b-68f280c6d84b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_222c442a-0632-4cce-a5d8-0a09fd3b8df9" xlink:to="loc_srt_MaximumMember_af706651-ec52-445b-944b-68f280c6d84b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_0bc7a1f5-9024-4db8-9906-0c2726fb8ce9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d6ca62c3-dd38-4447-89ee-37deecb54da3" xlink:to="loc_us-gaap_AwardTypeAxis_0bc7a1f5-9024-4db8-9906-0c2726fb8ce9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0bc7a1f5-9024-4db8-9906-0c2726fb8ce9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_0bc7a1f5-9024-4db8-9906-0c2726fb8ce9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0bc7a1f5-9024-4db8-9906-0c2726fb8ce9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3a478f36-8a5b-4051-97bc-d0e503725173" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_0bc7a1f5-9024-4db8-9906-0c2726fb8ce9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3a478f36-8a5b-4051-97bc-d0e503725173" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_3ae495a5-eb9e-4422-b959-6a63710f8c1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3a478f36-8a5b-4051-97bc-d0e503725173" xlink:to="loc_us-gaap_EmployeeStockOptionMember_3ae495a5-eb9e-4422-b959-6a63710f8c1f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_PerformanceBasedStockOptionsMember_732f9ac2-02d3-4479-a8f0-761664659f93" xlink:href="afrm-20250630.xsd#afrm_PerformanceBasedStockOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3a478f36-8a5b-4051-97bc-d0e503725173" xlink:to="loc_afrm_PerformanceBasedStockOptionsMember_732f9ac2-02d3-4479-a8f0-761664659f93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_33f6a25b-5269-47a7-855e-27611bd2c63b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3a478f36-8a5b-4051-97bc-d0e503725173" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_33f6a25b-5269-47a7-855e-27611bd2c63b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_a0d4b3cb-8587-4be2-8ac2-88e8f280a10c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3a478f36-8a5b-4051-97bc-d0e503725173" xlink:to="loc_us-gaap_EmployeeStockMember_a0d4b3cb-8587-4be2-8ac2-88e8f280a10c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_2c3d3e61-f52d-4cd1-9df3-19123fe1419a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d6ca62c3-dd38-4447-89ee-37deecb54da3" xlink:to="loc_us-gaap_VestingAxis_2c3d3e61-f52d-4cd1-9df3-19123fe1419a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_2c3d3e61-f52d-4cd1-9df3-19123fe1419a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_2c3d3e61-f52d-4cd1-9df3-19123fe1419a" xlink:to="loc_us-gaap_VestingDomain_2c3d3e61-f52d-4cd1-9df3-19123fe1419a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_d0b03512-9256-4610-ab62-320e801d586d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_2c3d3e61-f52d-4cd1-9df3-19123fe1419a" xlink:to="loc_us-gaap_VestingDomain_d0b03512-9256-4610-ab62-320e801d586d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_68b4e2c9-040a-40a7-b186-02842f941a47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_d0b03512-9256-4610-ab62-320e801d586d" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_68b4e2c9-040a-40a7-b186-02842f941a47" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_3de8e93d-b0ab-4c07-94b1-9f90624c1d19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_d0b03512-9256-4610-ab62-320e801d586d" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_3de8e93d-b0ab-4c07-94b1-9f90624c1d19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_a3ff4f03-1d0c-49eb-ba53-09ff6a7406b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_d0b03512-9256-4610-ab62-320e801d586d" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_a3ff4f03-1d0c-49eb-ba53-09ff6a7406b6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ShareBasedPaymentArrangementTrancheFourMember_36935852-01c8-4852-83c2-beaa729aacdc" xlink:href="afrm-20250630.xsd#afrm_ShareBasedPaymentArrangementTrancheFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_d0b03512-9256-4610-ab62-320e801d586d" xlink:to="loc_afrm_ShareBasedPaymentArrangementTrancheFourMember_36935852-01c8-4852-83c2-beaa729aacdc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ShareBasedPaymentArrangementTrancheFiveMember_517c8974-2f6a-4bfb-bc0d-15dc91609186" xlink:href="afrm-20250630.xsd#afrm_ShareBasedPaymentArrangementTrancheFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_d0b03512-9256-4610-ab62-320e801d586d" xlink:to="loc_afrm_ShareBasedPaymentArrangementTrancheFiveMember_517c8974-2f6a-4bfb-bc0d-15dc91609186" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_80d7cd91-37e7-4582-a5b0-cf868c428525" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_80d7cd91-37e7-4582-a5b0-cf868c428525" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_3614219d-fea3-4966-be20-4eff62ff1b7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_3614219d-fea3-4966-be20-4eff62ff1b7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriodPriorToIPO_cee3a128-4527-4767-b27d-51dd9a69c14a" xlink:href="afrm-20250630.xsd#afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriodPriorToIPO"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriodPriorToIPO_cee3a128-4527-4767-b27d-51dd9a69c14a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_5caedc4c-a72e-451f-91e1-04f3b47d62a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_5caedc4c-a72e-451f-91e1-04f3b47d62a8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_8934a07f-c711-4f4c-a135-41291eba8a4a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_8934a07f-c711-4f4c-a135-41291eba8a4a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_eb9838c1-2440-4c78-836d-647b7368f730" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_eb9838c1-2440-4c78-836d-647b7368f730" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_a6cbfc28-bf80-4ab2-89a9-7c4e2bd2b2f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_a6cbfc28-bf80-4ab2-89a9-7c4e2bd2b2f4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_2a5a478f-3071-41ef-934b-0f4cbde1c719" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_2a5a478f-3071-41ef-934b-0f4cbde1c719" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_842d9a46-3c98-4890-9c6c-8d2669be1a72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_842d9a46-3c98-4890-9c6c-8d2669be1a72" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_8b8effa5-e94d-470a-9d35-3488fbbbead5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_8b8effa5-e94d-470a-9d35-3488fbbbead5" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_abbfa6f4-5bec-47f2-8af0-c4a461baf8e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_abbfa6f4-5bec-47f2-8af0-c4a461baf8e6" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_17b4b954-ed23-42b4-a921-47ef3245028f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_17b4b954-ed23-42b4-a921-47ef3245028f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_NumberOfTranches_3b7ca3dd-7fa7-4726-a4c7-b4f8288cc130" xlink:href="afrm-20250630.xsd#afrm_NumberOfTranches"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_afrm_NumberOfTranches_3b7ca3dd-7fa7-4726-a4c7-b4f8288cc130" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardAverageTradingDayVolume_cc8ca584-9d30-41fa-82fc-da60e3a5a5fe" xlink:href="afrm-20250630.xsd#afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardAverageTradingDayVolume"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardAverageTradingDayVolume_cc8ca584-9d30-41fa-82fc-da60e3a5a5fe" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_11604ffe-e1d9-479d-9cba-5a32261d9ec3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_11604ffe-e1d9-479d-9cba-5a32261d9ec3" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_116e0289-17c7-4c06-baa0-462fa6b81de8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_116e0289-17c7-4c06-baa0-462fa6b81de8" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares_593e8ec1-dbec-4398-8ce5-e12260841d0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares_593e8ec1-dbec-4398-8ce5-e12260841d0d" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_a4018c79-5e6b-416b-b29d-74a2d1a746e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_a4018c79-5e6b-416b-b29d-74a2d1a746e1" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumberOfVestingConditions_6d1e3591-e40f-448e-989a-57c945719e1d" xlink:href="afrm-20250630.xsd#afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumberOfVestingConditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumberOfVestingConditions_6d1e3591-e40f-448e-989a-57c945719e1d" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_f8abe51e-a468-4044-aabf-e92ebda1092b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_f8abe51e-a468-4044-aabf-e92ebda1092b" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_2d3ef2fc-fae9-4b78-b6cf-b0c9a41e057e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_2d3ef2fc-fae9-4b78-b6cf-b0c9a41e057e" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_f9a27997-6a3d-4a85-acbc-17efc44295ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_f9a27997-6a3d-4a85-acbc-17efc44295ad" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePeriod_f51c165e-7b02-41cf-8fd0-9ffab96e2adf" xlink:href="afrm-20250630.xsd#afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePeriod_f51c165e-7b02-41cf-8fd0-9ffab96e2adf" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharePurchasePriceDiscountPercent_b30b0fe0-fa03-47cd-bc38-1d4e9d143b92" xlink:href="afrm-20250630.xsd#afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharePurchasePriceDiscountPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_738aad7d-76d2-45d5-b0c8-d7a8fa1c5992" xlink:to="loc_afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharePurchasePriceDiscountPercent_b30b0fe0-fa03-47cd-bc38-1d4e9d143b92" xlink:type="arc" order="23"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/EquityIncentivePlansScheduleofTranchesDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#EquityIncentivePlansScheduleofTranchesDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/EquityIncentivePlansScheduleofTranchesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cb64cb07-f8a8-41a7-8a75-728ae8787d88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_56b5bc53-8f4f-4d53-b56d-3f0bd44f1164" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cb64cb07-f8a8-41a7-8a75-728ae8787d88" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_56b5bc53-8f4f-4d53-b56d-3f0bd44f1164" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_a36e788f-652e-49b4-bd04-c1d7e26a9a6d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_56b5bc53-8f4f-4d53-b56d-3f0bd44f1164" xlink:to="loc_us-gaap_AwardTypeAxis_a36e788f-652e-49b4-bd04-c1d7e26a9a6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_a36e788f-652e-49b4-bd04-c1d7e26a9a6d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_a36e788f-652e-49b4-bd04-c1d7e26a9a6d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_a36e788f-652e-49b4-bd04-c1d7e26a9a6d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_63180722-4e0c-466a-b53c-798f9c61d5e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_a36e788f-652e-49b4-bd04-c1d7e26a9a6d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_63180722-4e0c-466a-b53c-798f9c61d5e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_PerformanceBasedStockOptionsMember_0fe5e622-6354-4355-8c75-93e6115f325b" xlink:href="afrm-20250630.xsd#afrm_PerformanceBasedStockOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_63180722-4e0c-466a-b53c-798f9c61d5e7" xlink:to="loc_afrm_PerformanceBasedStockOptionsMember_0fe5e622-6354-4355-8c75-93e6115f325b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_87a8af4a-6372-465d-a4f8-87ffa791fbcc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_56b5bc53-8f4f-4d53-b56d-3f0bd44f1164" xlink:to="loc_us-gaap_VestingAxis_87a8af4a-6372-465d-a4f8-87ffa791fbcc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_87a8af4a-6372-465d-a4f8-87ffa791fbcc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_87a8af4a-6372-465d-a4f8-87ffa791fbcc" xlink:to="loc_us-gaap_VestingDomain_87a8af4a-6372-465d-a4f8-87ffa791fbcc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_81b7f4f5-9161-4085-8eb9-9e97ae826979" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_87a8af4a-6372-465d-a4f8-87ffa791fbcc" xlink:to="loc_us-gaap_VestingDomain_81b7f4f5-9161-4085-8eb9-9e97ae826979" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_4b51835d-10f7-4d32-ad65-73a6dbe24849" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_81b7f4f5-9161-4085-8eb9-9e97ae826979" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_4b51835d-10f7-4d32-ad65-73a6dbe24849" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_76da4e25-0be0-413c-b9f0-e2cbc8e9a440" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_81b7f4f5-9161-4085-8eb9-9e97ae826979" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_76da4e25-0be0-413c-b9f0-e2cbc8e9a440" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_457eff90-39e0-4e94-9c74-b909770cf851" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_81b7f4f5-9161-4085-8eb9-9e97ae826979" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_457eff90-39e0-4e94-9c74-b909770cf851" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ShareBasedPaymentArrangementTrancheFourMember_1233aa94-e2a1-48e3-8d35-cc75f96714eb" xlink:href="afrm-20250630.xsd#afrm_ShareBasedPaymentArrangementTrancheFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_81b7f4f5-9161-4085-8eb9-9e97ae826979" xlink:to="loc_afrm_ShareBasedPaymentArrangementTrancheFourMember_1233aa94-e2a1-48e3-8d35-cc75f96714eb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ShareBasedPaymentArrangementTrancheFiveMember_1091533a-27ac-4ebd-a157-cf1c07176570" xlink:href="afrm-20250630.xsd#afrm_ShareBasedPaymentArrangementTrancheFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_81b7f4f5-9161-4085-8eb9-9e97ae826979" xlink:to="loc_afrm_ShareBasedPaymentArrangementTrancheFiveMember_1091533a-27ac-4ebd-a157-cf1c07176570" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ShareBasedPaymentArrangementTrancheSixMember_1932a895-50ad-422c-abe5-a41e7031671e" xlink:href="afrm-20250630.xsd#afrm_ShareBasedPaymentArrangementTrancheSixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_81b7f4f5-9161-4085-8eb9-9e97ae826979" xlink:to="loc_afrm_ShareBasedPaymentArrangementTrancheSixMember_1932a895-50ad-422c-abe5-a41e7031671e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ShareBasedPaymentArrangementTrancheSevenMember_51cf4476-a253-47d5-b28f-e215a0d7873a" xlink:href="afrm-20250630.xsd#afrm_ShareBasedPaymentArrangementTrancheSevenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_81b7f4f5-9161-4085-8eb9-9e97ae826979" xlink:to="loc_afrm_ShareBasedPaymentArrangementTrancheSevenMember_51cf4476-a253-47d5-b28f-e215a0d7873a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ShareBasedPaymentArrangementTrancheEightMember_5b653f27-8e97-4f42-9bba-1bfe3fe54893" xlink:href="afrm-20250630.xsd#afrm_ShareBasedPaymentArrangementTrancheEightMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_81b7f4f5-9161-4085-8eb9-9e97ae826979" xlink:to="loc_afrm_ShareBasedPaymentArrangementTrancheEightMember_5b653f27-8e97-4f42-9bba-1bfe3fe54893" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ShareBasedPaymentArrangementTrancheNineMember_9f387146-3149-43b7-b989-a66809a22feb" xlink:href="afrm-20250630.xsd#afrm_ShareBasedPaymentArrangementTrancheNineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_81b7f4f5-9161-4085-8eb9-9e97ae826979" xlink:to="loc_afrm_ShareBasedPaymentArrangementTrancheNineMember_9f387146-3149-43b7-b989-a66809a22feb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ShareBasedPaymentArrangementTrancheTenMember_e5bc5003-4d12-40e2-8b8d-1cac3af0db09" xlink:href="afrm-20250630.xsd#afrm_ShareBasedPaymentArrangementTrancheTenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_81b7f4f5-9161-4085-8eb9-9e97ae826979" xlink:to="loc_afrm_ShareBasedPaymentArrangementTrancheTenMember_e5bc5003-4d12-40e2-8b8d-1cac3af0db09" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharePriceHurdleToSatisfyPerformanceCondition_d2a53e38-7454-40fd-9bcc-b29d1d65d7a6" xlink:href="afrm-20250630.xsd#afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharePriceHurdleToSatisfyPerformanceCondition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cb64cb07-f8a8-41a7-8a75-728ae8787d88" xlink:to="loc_afrm_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharePriceHurdleToSatisfyPerformanceCondition_d2a53e38-7454-40fd-9bcc-b29d1d65d7a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_a6dd419f-76cf-4104-9372-32449e0916b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cb64cb07-f8a8-41a7-8a75-728ae8787d88" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_a6dd419f-76cf-4104-9372-32449e0916b1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/EquityIncentivePlansScheduleofRSUActivityDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#EquityIncentivePlansScheduleofRSUActivityDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/EquityIncentivePlansScheduleofRSUActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d87ebed7-c49d-4aa0-ad7b-b42631f5a8fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_e42911f0-3ece-4231-b630-f60032c4654c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d87ebed7-c49d-4aa0-ad7b-b42631f5a8fe" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_e42911f0-3ece-4231-b630-f60032c4654c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_1d1058e3-0ffa-420d-9de5-9be8e5d281f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_e42911f0-3ece-4231-b630-f60032c4654c" xlink:to="loc_us-gaap_AwardTypeAxis_1d1058e3-0ffa-420d-9de5-9be8e5d281f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1d1058e3-0ffa-420d-9de5-9be8e5d281f2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_1d1058e3-0ffa-420d-9de5-9be8e5d281f2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1d1058e3-0ffa-420d-9de5-9be8e5d281f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_74ed894b-419a-4031-bda8-4b14b6f40166" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_1d1058e3-0ffa-420d-9de5-9be8e5d281f2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_74ed894b-419a-4031-bda8-4b14b6f40166" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_33bf0661-c38d-4a9a-9510-1722706dac99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_74ed894b-419a-4031-bda8-4b14b6f40166" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_33bf0661-c38d-4a9a-9510-1722706dac99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8ff5e933-5759-41f0-b391-c4be272c1b37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d87ebed7-c49d-4aa0-ad7b-b42631f5a8fe" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8ff5e933-5759-41f0-b391-c4be272c1b37" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_9afbef43-a4f1-48df-902c-4529de5dc8b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8ff5e933-5759-41f0-b391-c4be272c1b37" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_9afbef43-a4f1-48df-902c-4529de5dc8b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_a5b3b0a8-3cea-428b-acf0-046a4fba70b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8ff5e933-5759-41f0-b391-c4be272c1b37" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_a5b3b0a8-3cea-428b-acf0-046a4fba70b9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_2f36c069-f25c-4fa0-ab7d-127081239fd1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8ff5e933-5759-41f0-b391-c4be272c1b37" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_2f36c069-f25c-4fa0-ab7d-127081239fd1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_6689faa9-43c6-4232-9b8b-f550e71bc76e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8ff5e933-5759-41f0-b391-c4be272c1b37" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_6689faa9-43c6-4232-9b8b-f550e71bc76e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_e46800c0-2adc-4b6c-87db-827c31ce6066" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_40e8ddbf-a85a-40a0-befc-1fee7d387da6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d87ebed7-c49d-4aa0-ad7b-b42631f5a8fe" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_40e8ddbf-a85a-40a0-befc-1fee7d387da6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_0486c0fa-5bd4-4684-a846-1f6c883b41cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_40e8ddbf-a85a-40a0-befc-1fee7d387da6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_0486c0fa-5bd4-4684-a846-1f6c883b41cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_9b47c6c0-d0fc-4aea-8640-d6b26a692f33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_40e8ddbf-a85a-40a0-befc-1fee7d387da6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_9b47c6c0-d0fc-4aea-8640-d6b26a692f33" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_b607105b-ef09-4dfb-96b7-0bb3661e86e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_40e8ddbf-a85a-40a0-befc-1fee7d387da6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_b607105b-ef09-4dfb-96b7-0bb3661e86e5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_6c884d39-bf3c-4c19-9cc1-06b80f6ad11c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_40e8ddbf-a85a-40a0-befc-1fee7d387da6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_6c884d39-bf3c-4c19-9cc1-06b80f6ad11c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_3fe757b0-b55b-4f72-90e6-fd4ef27fd4e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/EquityIncentivePlansScheduleofComponentsandClassificationofStockbasedCompensationDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#EquityIncentivePlansScheduleofComponentsandClassificationofStockbasedCompensationDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/EquityIncentivePlansScheduleofComponentsandClassificationofStockbasedCompensationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_6b7e02da-ec8e-46f4-9d90-9ac45fb08e74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_feafcc5f-ccc6-435d-b06d-2b5bc48b7543" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_6b7e02da-ec8e-46f4-9d90-9ac45fb08e74" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_feafcc5f-ccc6-435d-b06d-2b5bc48b7543" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_a7416027-c1d0-4100-b8ef-095a4b64265c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_feafcc5f-ccc6-435d-b06d-2b5bc48b7543" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_a7416027-c1d0-4100-b8ef-095a4b64265c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_a7416027-c1d0-4100-b8ef-095a4b64265c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_a7416027-c1d0-4100-b8ef-095a4b64265c" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_a7416027-c1d0-4100-b8ef-095a4b64265c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_f6a2e736-34bc-4e38-9863-6c07de5f92fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_a7416027-c1d0-4100-b8ef-095a4b64265c" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_f6a2e736-34bc-4e38-9863-6c07de5f92fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_697ae178-7295-43ce-8434-4ca9dd6d2dcd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_f6a2e736-34bc-4e38-9863-6c07de5f92fd" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_697ae178-7295-43ce-8434-4ca9dd6d2dcd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_TechnologyAndDataAnalyticsExpenseMember_a8b9d0a6-96ab-4f34-a6c1-b5140123d688" xlink:href="afrm-20250630.xsd#afrm_TechnologyAndDataAnalyticsExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_f6a2e736-34bc-4e38-9863-6c07de5f92fd" xlink:to="loc_afrm_TechnologyAndDataAnalyticsExpenseMember_a8b9d0a6-96ab-4f34-a6c1-b5140123d688" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_d7603fc9-e158-45cb-a504-250139071e48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingAndMarketingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_f6a2e736-34bc-4e38-9863-6c07de5f92fd" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_d7603fc9-e158-45cb-a504-250139071e48" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ProcessingAndServicingExpenseMember_f5e9ac6b-e2e6-44e7-b5f7-8e99c08d01e9" xlink:href="afrm-20250630.xsd#afrm_ProcessingAndServicingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_f6a2e736-34bc-4e38-9863-6c07de5f92fd" xlink:to="loc_afrm_ProcessingAndServicingExpenseMember_f5e9ac6b-e2e6-44e7-b5f7-8e99c08d01e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_47db6134-af59-42e2-b5a3-6b3a2589aa41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_6b7e02da-ec8e-46f4-9d90-9ac45fb08e74" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_47db6134-af59-42e2-b5a3-6b3a2589aa41" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount_451df754-3b03-4229-bfc8-2e3ba6103f51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_6b7e02da-ec8e-46f4-9d90-9ac45fb08e74" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount_451df754-3b03-4229-bfc8-2e3ba6103f51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1_1352a440-cd43-402d-90f0-f88e2280637f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_6b7e02da-ec8e-46f4-9d90-9ac45fb08e74" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1_1352a440-cd43-402d-90f0-f88e2280637f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/RestructuringandotherDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#RestructuringandotherDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/RestructuringandotherDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_ba446ff3-1d49-4757-9bde-ddc1f17b19cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_dcb65a2b-8b56-4192-a7fa-df5bf7b2b3f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_ba446ff3-1d49-4757-9bde-ddc1f17b19cc" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_dcb65a2b-8b56-4192-a7fa-df5bf7b2b3f7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_8e05232e-fe7e-49f5-a4ff-f4f847b806b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_dcb65a2b-8b56-4192-a7fa-df5bf7b2b3f7" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_8e05232e-fe7e-49f5-a4ff-f4f847b806b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_8e05232e-fe7e-49f5-a4ff-f4f847b806b9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_8e05232e-fe7e-49f5-a4ff-f4f847b806b9" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_8e05232e-fe7e-49f5-a4ff-f4f847b806b9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_68927112-1154-4fa6-b4ec-88f839d4d349" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_8e05232e-fe7e-49f5-a4ff-f4f847b806b9" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_68927112-1154-4fa6-b4ec-88f839d4d349" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_c3f140ff-1ada-4778-8324-77bc93f8bd17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_68927112-1154-4fa6-b4ec-88f839d4d349" xlink:to="loc_us-gaap_EmployeeSeveranceMember_c3f140ff-1ada-4778-8324-77bc93f8bd17" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_e187d283-5e70-4604-a483-350b301a1d68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_ba446ff3-1d49-4757-9bde-ddc1f17b19cc" xlink:to="loc_us-gaap_RestructuringCharges_e187d283-5e70-4604-a483-350b301a1d68" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_59417fef-a119-4aa5-b615-03d8f3db95b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_ba446ff3-1d49-4757-9bde-ddc1f17b19cc" xlink:to="loc_us-gaap_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_59417fef-a119-4aa5-b615-03d8f3db95b4" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/IncomeTaxesAdditionalInformationDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#IncomeTaxesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/IncomeTaxesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsLineItems_3237f544-5d0e-4da2-8550-01e515cc2275" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLossCarryforwardsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsTable_cb4ddcb5-5630-48be-99d9-92712aada7a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLossCarryforwardsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_3237f544-5d0e-4da2-8550-01e515cc2275" xlink:to="loc_us-gaap_OperatingLossCarryforwardsTable_cb4ddcb5-5630-48be-99d9-92712aada7a7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_6a2245e2-a02a-4c07-b2c0-2fa8cbd90dc6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_cb4ddcb5-5630-48be-99d9-92712aada7a7" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_6a2245e2-a02a-4c07-b2c0-2fa8cbd90dc6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_6a2245e2-a02a-4c07-b2c0-2fa8cbd90dc6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_6a2245e2-a02a-4c07-b2c0-2fa8cbd90dc6" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_6a2245e2-a02a-4c07-b2c0-2fa8cbd90dc6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_cf94d6d5-42b9-4e74-be86-b89b26a43229" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_6a2245e2-a02a-4c07-b2c0-2fa8cbd90dc6" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_cf94d6d5-42b9-4e74-be86-b89b26a43229" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_9d2516e6-31d3-4a92-816c-bc3853d7a386" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DomesticCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_cf94d6d5-42b9-4e74-be86-b89b26a43229" xlink:to="loc_us-gaap_DomesticCountryMember_9d2516e6-31d3-4a92-816c-bc3853d7a386" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_8085ae5a-d2cf-49ca-8f35-ff9072db806d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_cf94d6d5-42b9-4e74-be86-b89b26a43229" xlink:to="loc_us-gaap_ForeignCountryMember_8085ae5a-d2cf-49ca-8f35-ff9072db806d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_070ec21b-0468-458b-ad3d-b71da175f0c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_cf94d6d5-42b9-4e74-be86-b89b26a43229" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_070ec21b-0468-458b-ad3d-b71da175f0c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardAxis_49073177-06c5-4d46-af54-724489d511eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TaxCreditCarryforwardAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_cb4ddcb5-5630-48be-99d9-92712aada7a7" xlink:to="loc_us-gaap_TaxCreditCarryforwardAxis_49073177-06c5-4d46-af54-724489d511eb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardNameDomain_49073177-06c5-4d46-af54-724489d511eb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TaxCreditCarryforwardNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TaxCreditCarryforwardAxis_49073177-06c5-4d46-af54-724489d511eb" xlink:to="loc_us-gaap_TaxCreditCarryforwardNameDomain_49073177-06c5-4d46-af54-724489d511eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardNameDomain_e5b24ac8-6038-41a6-94b3-e24ed1916cee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TaxCreditCarryforwardNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TaxCreditCarryforwardAxis_49073177-06c5-4d46-af54-724489d511eb" xlink:to="loc_us-gaap_TaxCreditCarryforwardNameDomain_e5b24ac8-6038-41a6-94b3-e24ed1916cee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchMember_5ac4c396-5fe4-4e2b-b390-45772dd19ec9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardNameDomain_e5b24ac8-6038-41a6-94b3-e24ed1916cee" xlink:to="loc_us-gaap_ResearchMember_5ac4c396-5fe4-4e2b-b390-45772dd19ec9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_9237eb5f-9700-4177-8842-9cc7603a4425" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_cb4ddcb5-5630-48be-99d9-92712aada7a7" xlink:to="loc_srt_StatementGeographicalAxis_9237eb5f-9700-4177-8842-9cc7603a4425" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_9237eb5f-9700-4177-8842-9cc7603a4425_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_9237eb5f-9700-4177-8842-9cc7603a4425" xlink:to="loc_srt_SegmentGeographicalDomain_9237eb5f-9700-4177-8842-9cc7603a4425_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_3fba020b-f364-47fb-81db-a114776666b4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_9237eb5f-9700-4177-8842-9cc7603a4425" xlink:to="loc_srt_SegmentGeographicalDomain_3fba020b-f364-47fb-81db-a114776666b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CA_9dde3e8c-8379-4d8e-8bfa-478280cb798c" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_3fba020b-f364-47fb-81db-a114776666b4" xlink:to="loc_country_CA_9dde3e8c-8379-4d8e-8bfa-478280cb798c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_c045f128-cf10-40a4-90e6-4c68990153f5" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_3fba020b-f364-47fb-81db-a114776666b4" xlink:to="loc_country_GB_c045f128-cf10-40a4-90e6-4c68990153f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_ed2d17b8-970d-4150-b5e1-af6c00832689" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_3237f544-5d0e-4da2-8550-01e515cc2275" xlink:to="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_ed2d17b8-970d-4150-b5e1-af6c00832689" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_58ce7d59-63cc-4ef4-8932-9535ccd4cd4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_3237f544-5d0e-4da2-8550-01e515cc2275" xlink:to="loc_us-gaap_OperatingLossCarryforwards_58ce7d59-63cc-4ef4-8932-9535ccd4cd4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardAmount_ed034636-0291-429b-b3a7-c0c21926272b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TaxCreditCarryforwardAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_3237f544-5d0e-4da2-8550-01e515cc2275" xlink:to="loc_us-gaap_TaxCreditCarryforwardAmount_ed034636-0291-429b-b3a7-c0c21926272b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_OperatingLossCarryforwardsSubjectToExpiration_b09104ce-ec26-4998-bdbd-a95d9286d6b0" xlink:href="afrm-20250630.xsd#afrm_OperatingLossCarryforwardsSubjectToExpiration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_3237f544-5d0e-4da2-8550-01e515cc2275" xlink:to="loc_afrm_OperatingLossCarryforwardsSubjectToExpiration_b09104ce-ec26-4998-bdbd-a95d9286d6b0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_f56b5aaf-095b-41e0-a61e-1fd0b40ce5e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_3237f544-5d0e-4da2-8550-01e515cc2275" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_f56b5aaf-095b-41e0-a61e-1fd0b40ce5e5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_b6bfd191-3c71-447c-8bc2-931ddd3ff2b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseInUnrecognizedTaxBenefitsIsReasonablyPossible"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_3237f544-5d0e-4da2-8550-01e515cc2275" xlink:to="loc_us-gaap_IncreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_b6bfd191-3c71-447c-8bc2-931ddd3ff2b5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_559e14dc-dcf4-496d-8b3e-1e0573fc1fa1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_3237f544-5d0e-4da2-8550-01e515cc2275" xlink:to="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_559e14dc-dcf4-496d-8b3e-1e0573fc1fa1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_90490d67-22dd-478e-a6ad-90104957642f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_3237f544-5d0e-4da2-8550-01e515cc2275" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_90490d67-22dd-478e-a6ad-90104957642f" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/NetIncomeLossperShareAttributabletoCommonStockholdersScheduleofBasicandDilutedNetLossPerShareDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#NetIncomeLossperShareAttributabletoCommonStockholdersScheduleofBasicandDilutedNetLossPerShareDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/NetIncomeLossperShareAttributabletoCommonStockholdersScheduleofBasicandDilutedNetLossPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDilutedLineItems_b263ccb5-5c9d-4bb8-a85e-175b55577c19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDilutedLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_01c124e6-5d90-40b5-a46d-d84144010ce0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_b263ccb5-5c9d-4bb8-a85e-175b55577c19" xlink:to="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_01c124e6-5d90-40b5-a46d-d84144010ce0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_e1a1eba9-c69e-4713-bb3d-4c17c0b1a7da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_01c124e6-5d90-40b5-a46d-d84144010ce0" xlink:to="loc_us-gaap_StatementClassOfStockAxis_e1a1eba9-c69e-4713-bb3d-4c17c0b1a7da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_e1a1eba9-c69e-4713-bb3d-4c17c0b1a7da_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_e1a1eba9-c69e-4713-bb3d-4c17c0b1a7da" xlink:to="loc_us-gaap_ClassOfStockDomain_e1a1eba9-c69e-4713-bb3d-4c17c0b1a7da_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_05e8fcd4-cb7d-44b4-bf17-a04ee3e4a1d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_e1a1eba9-c69e-4713-bb3d-4c17c0b1a7da" xlink:to="loc_us-gaap_ClassOfStockDomain_05e8fcd4-cb7d-44b4-bf17-a04ee3e4a1d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_c434a447-bdce-40c9-a4b3-3012fc2eb3d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_05e8fcd4-cb7d-44b4-bf17-a04ee3e4a1d3" xlink:to="loc_us-gaap_CommonClassAMember_c434a447-bdce-40c9-a4b3-3012fc2eb3d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_230951dd-b8f4-472e-b400-5422555b0bd9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_05e8fcd4-cb7d-44b4-bf17-a04ee3e4a1d3" xlink:to="loc_us-gaap_CommonClassBMember_230951dd-b8f4-472e-b400-5422555b0bd9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_0e93c33e-3053-4610-9ee7-cdccf61ab97c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_01c124e6-5d90-40b5-a46d-d84144010ce0" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_0e93c33e-3053-4610-9ee7-cdccf61ab97c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_0e93c33e-3053-4610-9ee7-cdccf61ab97c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_0e93c33e-3053-4610-9ee7-cdccf61ab97c" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_0e93c33e-3053-4610-9ee7-cdccf61ab97c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_053e752f-22a8-452a-866a-05a9223365b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_0e93c33e-3053-4610-9ee7-cdccf61ab97c" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_053e752f-22a8-452a-866a-05a9223365b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_4b75c73f-ccad-4303-8500-724d6e3c5f11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_053e752f-22a8-452a-866a-05a9223365b3" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_4b75c73f-ccad-4303-8500-724d6e3c5f11" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_c08602b1-6502-4d1d-9a8e-2dd770428952" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_053e752f-22a8-452a-866a-05a9223365b3" xlink:to="loc_us-gaap_EmployeeStockOptionMember_c08602b1-6502-4d1d-9a8e-2dd770428952" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ValueCreationAwardVestedSharesMember_a6d7e5a6-193b-4fba-b59b-adc3a37143d5" xlink:href="afrm-20250630.xsd#afrm_ValueCreationAwardVestedSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_053e752f-22a8-452a-866a-05a9223365b3" xlink:to="loc_afrm_ValueCreationAwardVestedSharesMember_a6d7e5a6-193b-4fba-b59b-adc3a37143d5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_7708f216-2aad-4158-8533-0b83c211f15a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_053e752f-22a8-452a-866a-05a9223365b3" xlink:to="loc_us-gaap_EmployeeStockMember_7708f216-2aad-4158-8533-0b83c211f15a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_55b85f1b-a3ec-4bea-93cc-fb6c86a7c732" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_b263ccb5-5c9d-4bb8-a85e-175b55577c19" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_55b85f1b-a3ec-4bea-93cc-fb6c86a7c732" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_7ef79269-c16a-4b75-9f9b-b2dda1b4322e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_55b85f1b-a3ec-4bea-93cc-fb6c86a7c732" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_7ef79269-c16a-4b75-9f9b-b2dda1b4322e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_38a9c83d-269a-4653-a9bf-b89689b2248d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_55b85f1b-a3ec-4bea-93cc-fb6c86a7c732" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_38a9c83d-269a-4653-a9bf-b89689b2248d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_44dc6d96-b3ab-4dbb-9001-decab56074e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_b263ccb5-5c9d-4bb8-a85e-175b55577c19" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_44dc6d96-b3ab-4dbb-9001-decab56074e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_4b91f075-2705-4092-8568-e1d3d29cd40e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_44dc6d96-b3ab-4dbb-9001-decab56074e4" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_4b91f075-2705-4092-8568-e1d3d29cd40e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_3a6ca9b7-e86c-4278-ae67-4db637ce617c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_44dc6d96-b3ab-4dbb-9001-decab56074e4" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_3a6ca9b7-e86c-4278-ae67-4db637ce617c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_db77831a-aefa-49f9-aad7-09f647eb5c09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_44dc6d96-b3ab-4dbb-9001-decab56074e4" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_db77831a-aefa-49f9-aad7-09f647eb5c09" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_e4b154bc-557c-43a0-a41a-0d9e36943b5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_b263ccb5-5c9d-4bb8-a85e-175b55577c19" xlink:to="loc_us-gaap_EarningsPerShareBasicAbstract_e4b154bc-557c-43a0-a41a-0d9e36943b5c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_5365288e-1d04-4cc2-bfa3-263ed7138685" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_e4b154bc-557c-43a0-a41a-0d9e36943b5c" xlink:to="loc_us-gaap_EarningsPerShareBasic_5365288e-1d04-4cc2-bfa3-263ed7138685" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_88de91c6-ac92-446f-9f61-967216e6ca49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_e4b154bc-557c-43a0-a41a-0d9e36943b5c" xlink:to="loc_us-gaap_EarningsPerShareDiluted_88de91c6-ac92-446f-9f61-967216e6ca49" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/NetIncomeLossperShareAttributabletoCommonStockholdersScheduleofCommonStockEquivalentsExcludedfromCalculationofDilutedNetLossPerShareDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#NetIncomeLossperShareAttributabletoCommonStockholdersScheduleofCommonStockEquivalentsExcludedfromCalculationofDilutedNetLossPerShareDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/NetIncomeLossperShareAttributabletoCommonStockholdersScheduleofCommonStockEquivalentsExcludedfromCalculationofDilutedNetLossPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_26bba307-365b-424c-abb5-f3a0daeb43af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_ba144e28-221d-43e6-a09d-3be13dbd4704" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_26bba307-365b-424c-abb5-f3a0daeb43af" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_ba144e28-221d-43e6-a09d-3be13dbd4704" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_4ca249a1-29f0-416d-b1e6-aef5001d8640" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_ba144e28-221d-43e6-a09d-3be13dbd4704" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_4ca249a1-29f0-416d-b1e6-aef5001d8640" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_4ca249a1-29f0-416d-b1e6-aef5001d8640_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_4ca249a1-29f0-416d-b1e6-aef5001d8640" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_4ca249a1-29f0-416d-b1e6-aef5001d8640_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_ec85bf92-7643-4da0-99e9-444083fc7b87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_4ca249a1-29f0-416d-b1e6-aef5001d8640" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_ec85bf92-7643-4da0-99e9-444083fc7b87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_2a99081c-4aab-4985-96fc-22101aa6b739" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_ec85bf92-7643-4da0-99e9-444083fc7b87" xlink:to="loc_us-gaap_WarrantMember_2a99081c-4aab-4985-96fc-22101aa6b739" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_67834032-f0fc-4308-8452-ad4db6c6b4fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_ec85bf92-7643-4da0-99e9-444083fc7b87" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_67834032-f0fc-4308-8452-ad4db6c6b4fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_702faa34-11a9-4b61-832d-9ea5a363b25c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_ec85bf92-7643-4da0-99e9-444083fc7b87" xlink:to="loc_us-gaap_EmployeeStockOptionMember_702faa34-11a9-4b61-832d-9ea5a363b25c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_c79b4ed9-1c6c-49d1-a67a-1271792e015a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_ec85bf92-7643-4da0-99e9-444083fc7b87" xlink:to="loc_us-gaap_EmployeeStockMember_c79b4ed9-1c6c-49d1-a67a-1271792e015a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_f734c04a-36c3-43cd-8dc8-3fb7d23eb746" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_26bba307-365b-424c-abb5-f3a0daeb43af" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_f734c04a-36c3-43cd-8dc8-3fb7d23eb746" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/SegmentsandGeographicalInformationScheduleofRevenuebyGeographicAreaDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#SegmentsandGeographicalInformationScheduleofRevenuebyGeographicAreaDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/SegmentsandGeographicalInformationScheduleofRevenuebyGeographicAreaDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_900eb4ea-1da3-4418-8576-29231959545e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_9985caf2-6746-495a-afd7-acf31e1ba925" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_900eb4ea-1da3-4418-8576-29231959545e" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_9985caf2-6746-495a-afd7-acf31e1ba925" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_894c218d-8c40-4f66-98ec-fbc1568121a2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_9985caf2-6746-495a-afd7-acf31e1ba925" xlink:to="loc_srt_StatementGeographicalAxis_894c218d-8c40-4f66-98ec-fbc1568121a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_894c218d-8c40-4f66-98ec-fbc1568121a2_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_894c218d-8c40-4f66-98ec-fbc1568121a2" xlink:to="loc_srt_SegmentGeographicalDomain_894c218d-8c40-4f66-98ec-fbc1568121a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_7783b652-ca92-4469-a3e0-8b3ff9bb0a13" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_894c218d-8c40-4f66-98ec-fbc1568121a2" xlink:to="loc_srt_SegmentGeographicalDomain_7783b652-ca92-4469-a3e0-8b3ff9bb0a13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_afcd89e8-2d94-4777-a3a8-13b96abda864" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_7783b652-ca92-4469-a3e0-8b3ff9bb0a13" xlink:to="loc_country_US_afcd89e8-2d94-4777-a3a8-13b96abda864" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CA_68eea85c-9ac5-4ca9-907c-e79dd8d8e35d" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_7783b652-ca92-4469-a3e0-8b3ff9bb0a13" xlink:to="loc_country_CA_68eea85c-9ac5-4ca9-907c-e79dd8d8e35d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_OtherGeographicalMember_c83a623e-aacf-4710-8aae-82f0ce200ad7" xlink:href="afrm-20250630.xsd#afrm_OtherGeographicalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_7783b652-ca92-4469-a3e0-8b3ff9bb0a13" xlink:to="loc_afrm_OtherGeographicalMember_c83a623e-aacf-4710-8aae-82f0ce200ad7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_9fea552d-d4cd-4a9d-be7e-3d013852e0c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_900eb4ea-1da3-4418-8576-29231959545e" xlink:to="loc_us-gaap_Revenues_9fea552d-d4cd-4a9d-be7e-3d013852e0c9" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/SegmentsandGeographicalInformationScheduleofLonglivedAssetsbyGeographicAreaDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#SegmentsandGeographicalInformationScheduleofLonglivedAssetsbyGeographicAreaDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/SegmentsandGeographicalInformationScheduleofLonglivedAssetsbyGeographicAreaDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_0ad80c0a-b075-484f-ab2d-ef6c6571f328" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_540d009f-0d01-4d2a-b367-9a8b30b5a6dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_0ad80c0a-b075-484f-ab2d-ef6c6571f328" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_540d009f-0d01-4d2a-b367-9a8b30b5a6dd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_654e1449-e416-475d-a04c-5edde3c5b6a2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_540d009f-0d01-4d2a-b367-9a8b30b5a6dd" xlink:to="loc_srt_StatementGeographicalAxis_654e1449-e416-475d-a04c-5edde3c5b6a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_654e1449-e416-475d-a04c-5edde3c5b6a2_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_654e1449-e416-475d-a04c-5edde3c5b6a2" xlink:to="loc_srt_SegmentGeographicalDomain_654e1449-e416-475d-a04c-5edde3c5b6a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_8dd5dd31-4483-4d66-af23-5b88729cf3df" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_654e1449-e416-475d-a04c-5edde3c5b6a2" xlink:to="loc_srt_SegmentGeographicalDomain_8dd5dd31-4483-4d66-af23-5b88729cf3df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_8a987d71-b4e7-4198-8535-f2d900c5c945" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8dd5dd31-4483-4d66-af23-5b88729cf3df" xlink:to="loc_country_US_8a987d71-b4e7-4198-8535-f2d900c5c945" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CA_be4d2fef-3952-49ba-8c16-db97657dcf9f" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8dd5dd31-4483-4d66-af23-5b88729cf3df" xlink:to="loc_country_CA_be4d2fef-3952-49ba-8c16-db97657dcf9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_OtherGeographicalMember_dfa6f1ab-9ce5-4036-9984-46658461d398" xlink:href="afrm-20250630.xsd#afrm_OtherGeographicalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8dd5dd31-4483-4d66-af23-5b88729cf3df" xlink:to="loc_afrm_OtherGeographicalMember_dfa6f1ab-9ce5-4036-9984-46658461d398" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_11d6f402-1ab1-4bd6-9482-39dc2f0db043" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_0ad80c0a-b075-484f-ab2d-ef6c6571f328" xlink:to="loc_us-gaap_NoncurrentAssets_11d6f402-1ab1-4bd6-9482-39dc2f0db043" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.affirm.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="afrm-20250630.xsd#SubsequentEventsDetails"/>
  <link:definitionLink xlink:role="http://www.affirm.com/role/SubsequentEventsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_9aad4cca-c13d-4e3e-8184-72475e497be7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_4c869054-8fee-4bb2-8393-d67b36a5e0a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_9aad4cca-c13d-4e3e-8184-72475e497be7" xlink:to="loc_us-gaap_SubsequentEventTable_4c869054-8fee-4bb2-8393-d67b36a5e0a4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_f49c2095-8089-4209-a6a3-2371ea84f782" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_4c869054-8fee-4bb2-8393-d67b36a5e0a4" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_f49c2095-8089-4209-a6a3-2371ea84f782" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_f49c2095-8089-4209-a6a3-2371ea84f782_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_f49c2095-8089-4209-a6a3-2371ea84f782" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_f49c2095-8089-4209-a6a3-2371ea84f782_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_3502d332-c2ac-4dc4-8396-d134cf90d33a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_f49c2095-8089-4209-a6a3-2371ea84f782" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_3502d332-c2ac-4dc4-8396-d134cf90d33a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_55c68d17-e33a-4698-b77f-a7df2a655465" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_3502d332-c2ac-4dc4-8396-d134cf90d33a" xlink:to="loc_us-gaap_SubsequentEventMember_55c68d17-e33a-4698-b77f-a7df2a655465" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_0e316675-dd1a-4eea-ad88-c0ffa859926e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_4c869054-8fee-4bb2-8393-d67b36a5e0a4" xlink:to="loc_us-gaap_DebtInstrumentAxis_0e316675-dd1a-4eea-ad88-c0ffa859926e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_0e316675-dd1a-4eea-ad88-c0ffa859926e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_0e316675-dd1a-4eea-ad88-c0ffa859926e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_0e316675-dd1a-4eea-ad88-c0ffa859926e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_fc3323eb-81a1-4e73-ba59-8f5bcfc172de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_0e316675-dd1a-4eea-ad88-c0ffa859926e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_fc3323eb-81a1-4e73-ba59-8f5bcfc172de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_ConvertibleSeniorNotesDue2026Member_d5e40dd4-2c91-47c7-8c9e-cd32a2afd8e7" xlink:href="afrm-20250630.xsd#afrm_ConvertibleSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_fc3323eb-81a1-4e73-ba59-8f5bcfc172de" xlink:to="loc_afrm_ConvertibleSeniorNotesDue2026Member_d5e40dd4-2c91-47c7-8c9e-cd32a2afd8e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_800542f6-c327-408a-8438-32d5e0c5ce50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_4c869054-8fee-4bb2-8393-d67b36a5e0a4" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_800542f6-c327-408a-8438-32d5e0c5ce50" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_800542f6-c327-408a-8438-32d5e0c5ce50_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_800542f6-c327-408a-8438-32d5e0c5ce50" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_800542f6-c327-408a-8438-32d5e0c5ce50_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e2701ac6-8828-4e10-9b9f-e2f6bcf963ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_800542f6-c327-408a-8438-32d5e0c5ce50" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e2701ac6-8828-4e10-9b9f-e2f6bcf963ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_6393113e-8d01-498b-b5b6-cb2adde19a24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_e2701ac6-8828-4e10-9b9f-e2f6bcf963ca" xlink:to="loc_us-gaap_ConvertibleDebtMember_6393113e-8d01-498b-b5b6-cb2adde19a24" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfConvertibleDebt_83602b3c-dc07-4b27-8918-29d298fa91fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_9aad4cca-c13d-4e3e-8184-72475e497be7" xlink:to="loc_us-gaap_RepaymentsOfConvertibleDebt_83602b3c-dc07-4b27-8918-29d298fa91fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_a8b67a69-6197-41a8-8ce6-eb6a6808a29c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentRepurchasedFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_9aad4cca-c13d-4e3e-8184-72475e497be7" xlink:to="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_a8b67a69-6197-41a8-8ce6-eb6a6808a29c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_DebtInstrumentRepurchasedCarryingAmount_797df090-34c8-4342-85d4-818072c112d0" xlink:href="afrm-20250630.xsd#afrm_DebtInstrumentRepurchasedCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_9aad4cca-c13d-4e3e-8184-72475e497be7" xlink:to="loc_afrm_DebtInstrumentRepurchasedCarryingAmount_797df090-34c8-4342-85d4-818072c112d0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_7f0a4fae-385a-4c4f-88f3-ea1e4eab6851" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_9aad4cca-c13d-4e3e-8184-72475e497be7" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_7f0a4fae-385a-4c4f-88f3-ea1e4eab6851" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfOtherComprehensiveIncomeAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementOfOtherComprehensiveIncomeAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementOfOtherComprehensiveIncomeAbstract" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:type="arc" order="81"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract" xlink:to="loc_us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets" xlink:type="arc" order="691"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RestructuringChargesReversalsAndOtherExpense_17b5c3fe-09e3-46c9-932d-d81c9e074a90" xlink:href="afrm-20250630.xsd#afrm_RestructuringChargesReversalsAndOtherExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract" xlink:to="loc_afrm_RestructuringChargesReversalsAndOtherExpense_17b5c3fe-09e3-46c9-932d-d81c9e074a90" xlink:type="arc" order="692"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilities" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedLiabilitiesAndOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilities" xlink:type="arc" order="31"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#IndividualsOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllIndividualsMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AllIndividualsMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_afrm_RobOHareMember_f4a2725b-e4e1-4968-ab0e-4fe4c8b38698" xlink:href="afrm-20250630.xsd#afrm_RobOHareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_afrm_RobOHareMember_f4a2725b-e4e1-4968-ab0e-4fe4c8b38698" xlink:type="arc" order="2"/>
  </link:definitionLink>
</link:linkbase>
