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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019cd350-8107-76ab-9fec-56c2b9a4429a,g:16dffd5e-f289-41de-9f5a-c2995a86dc93-->
<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://forhims.com/role/Cover" xlink:type="simple" xlink:href="hims-20260331.xsd#Cover"/>
  <link:definitionLink xlink:role="http://forhims.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019cd350-826b-7133-81f7-542060f859f2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019cd350-826b-7fd5-85ba-03db8994ed50" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_DocumentInformationTable_019cd350-826b-7fd5-85ba-03db8994ed50" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cd350-826b-7016-8351-5982f6070f65" 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_019cd350-826b-7fd5-85ba-03db8994ed50" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cd350-826b-7016-8351-5982f6070f65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cd350-826b-7016-8351-5982f6070f65_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_019cd350-826b-7016-8351-5982f6070f65" xlink:to="loc_us-gaap_ClassOfStockDomain_019cd350-826b-7016-8351-5982f6070f65_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cd350-826b-7479-916d-9b396ad2c4a2" 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_019cd350-826b-7016-8351-5982f6070f65" xlink:to="loc_us-gaap_ClassOfStockDomain_019cd350-826b-7479-916d-9b396ad2c4a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019cd350-826b-777b-b00c-e0f06f1423a7" 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_019cd350-826b-7479-916d-9b396ad2c4a2" xlink:to="loc_us-gaap_CommonClassAMember_019cd350-826b-777b-b00c-e0f06f1423a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_CommonClassVMember_019cd350-826b-7453-8373-bf24b4b84e0b" xlink:href="hims-20260331.xsd#hims_CommonClassVMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019cd350-826b-7479-916d-9b396ad2c4a2" xlink:to="loc_hims_CommonClassVMember_019cd350-826b-7453-8373-bf24b4b84e0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019cd350-826b-717e-89f2-55fdbf1b0e40" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_DocumentType_019cd350-826b-717e-89f2-55fdbf1b0e40" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_019cd350-826b-78f2-aa2b-6d251f9cd7ff" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_DocumentQuarterlyReport_019cd350-826b-78f2-aa2b-6d251f9cd7ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019cd350-826b-73ee-a489-5c377466fe3d" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_DocumentPeriodEndDate_019cd350-826b-73ee-a489-5c377466fe3d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_019cd350-826b-7458-b398-f4f4a0d915b5" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_DocumentTransitionReport_019cd350-826b-7458-b398-f4f4a0d915b5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019cd350-826b-7643-bbc5-fe626b9601f4" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_EntityRegistrantName_019cd350-826b-7643-bbc5-fe626b9601f4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019cd350-826b-73d6-ae26-c1a0d5eef7a0" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019cd350-826b-73d6-ae26-c1a0d5eef7a0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019cd350-826b-7bba-9f14-d66d07d9f720" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_EntityFileNumber_019cd350-826b-7bba-9f14-d66d07d9f720" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019cd350-826b-7e6b-991e-9ce9b28e2845" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_EntityTaxIdentificationNumber_019cd350-826b-7e6b-991e-9ce9b28e2845" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019cd350-826b-7ed6-8d88-be6aa2ed7af2" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_EntityAddressAddressLine1_019cd350-826b-7ed6-8d88-be6aa2ed7af2" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019cd350-826b-792a-8cd8-e1d3e8b9c10f" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_EntityAddressCityOrTown_019cd350-826b-792a-8cd8-e1d3e8b9c10f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019cd350-826b-72a2-b1dd-c8d2ade22bf0" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_EntityAddressStateOrProvince_019cd350-826b-72a2-b1dd-c8d2ade22bf0" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019cd350-826b-75e9-8e48-37cc93c60f94" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_EntityAddressPostalZipCode_019cd350-826b-75e9-8e48-37cc93c60f94" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019cd350-826b-73c4-a1d0-c55a2f5b2fb5" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_CityAreaCode_019cd350-826b-73c4-a1d0-c55a2f5b2fb5" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019cd350-826b-7a8c-a5db-8ca277577c37" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_LocalPhoneNumber_019cd350-826b-7a8c-a5db-8ca277577c37" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019cd350-826b-7b66-9459-1819b47cdd01" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_Security12bTitle_019cd350-826b-7b66-9459-1819b47cdd01" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019cd350-826b-707a-8079-face2d4d7863" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_TradingSymbol_019cd350-826b-707a-8079-face2d4d7863" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019cd350-826b-7a73-bed3-65f262dd9e08" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_SecurityExchangeName_019cd350-826b-7a73-bed3-65f262dd9e08" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_019cd350-826b-7afc-bb5c-4b41ecf13a6c" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_EntityCurrentReportingStatus_019cd350-826b-7afc-bb5c-4b41ecf13a6c" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_019cd350-826b-73c5-b9da-0a90c6bf0465" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_EntityInteractiveDataCurrent_019cd350-826b-73c5-b9da-0a90c6bf0465" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_019cd350-826b-7dc7-8181-8db8bf02f2e1" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_EntityFilerCategory_019cd350-826b-7dc7-8181-8db8bf02f2e1" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_019cd350-826b-7acb-a1a1-0196efc86fe4" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_EntitySmallBusiness_019cd350-826b-7acb-a1a1-0196efc86fe4" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019cd350-826b-7cc9-8445-a763a412ba3c" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_EntityEmergingGrowthCompany_019cd350-826b-7cc9-8445-a763a412ba3c" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_019cd350-826b-7c51-9de5-b65c5b6e13a0" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_EntityShellCompany_019cd350-826b-7c51-9de5-b65c5b6e13a0" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_019cd350-826b-7c08-97e9-46ea38f542b4" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_019cd350-826b-7c08-97e9-46ea38f542b4" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019cd350-826b-701c-9638-56b1eb92ddd9" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_AmendmentFlag_019cd350-826b-701c-9638-56b1eb92ddd9" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_019cd350-826b-7b64-b703-8ae06fceaef1" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_DocumentFiscalYearFocus_019cd350-826b-7b64-b703-8ae06fceaef1" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_019cd350-826b-781c-91fd-c6e88ae6f0db" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_DocumentFiscalPeriodFocus_019cd350-826b-781c-91fd-c6e88ae6f0db" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019cd350-826b-759d-bf2c-5091aa424a8d" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_EntityCentralIndexKey_019cd350-826b-759d-bf2c-5091aa424a8d" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_019cd350-826b-7ea2-8b4f-2067fbcc9f17" 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_019cd350-826b-7133-81f7-542060f859f2" xlink:to="loc_dei_CurrentFiscalYearEndDate_019cd350-826b-7ea2-8b4f-2067fbcc9f17" xlink:type="arc" order="28"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="simple" xlink:href="hims-20260331.xsd#CondensedConsolidatedBalanceSheetsParenthetical"/>
  <link:definitionLink xlink:role="http://forhims.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019cd350-826b-7248-88c5-b0ca18a9747f" 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_019cd350-826b-7d3c-af0e-bc0c61d424e5" 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_019cd350-826b-7248-88c5-b0ca18a9747f" xlink:to="loc_us-gaap_StatementTable_019cd350-826b-7d3c-af0e-bc0c61d424e5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cd350-826b-7720-bdd2-43640dc807d2" 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_019cd350-826b-7d3c-af0e-bc0c61d424e5" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cd350-826b-7720-bdd2-43640dc807d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cd350-826b-7720-bdd2-43640dc807d2_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_019cd350-826b-7720-bdd2-43640dc807d2" xlink:to="loc_us-gaap_ClassOfStockDomain_019cd350-826b-7720-bdd2-43640dc807d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cd350-826b-7072-acc9-527a88f7839a" 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_019cd350-826b-7720-bdd2-43640dc807d2" xlink:to="loc_us-gaap_ClassOfStockDomain_019cd350-826b-7072-acc9-527a88f7839a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019cd350-826b-77d4-9afa-177acff1da94" 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_019cd350-826b-7072-acc9-527a88f7839a" xlink:to="loc_us-gaap_CommonClassAMember_019cd350-826b-77d4-9afa-177acff1da94" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_CommonClassVMember_019cd350-826b-78a1-a6ce-123a59e6da78" xlink:href="hims-20260331.xsd#hims_CommonClassVMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019cd350-826b-7072-acc9-527a88f7839a" xlink:to="loc_hims_CommonClassVMember_019cd350-826b-78a1-a6ce-123a59e6da78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019cd350-826b-727e-bce2-67bb929c01d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019cd350-826b-7248-88c5-b0ca18a9747f" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019cd350-826b-727e-bce2-67bb929c01d7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_019cd350-826b-72b8-9d1a-628633f23e95" 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_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019cd350-826b-727e-bce2-67bb929c01d7" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_019cd350-826b-72b8-9d1a-628633f23e95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_019cd350-826b-7c75-b584-ad2a6f6502cf" 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_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019cd350-826b-727e-bce2-67bb929c01d7" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_019cd350-826b-7c75-b584-ad2a6f6502cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_019cd350-826b-7de0-be40-79d8458402f1" 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_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019cd350-826b-727e-bce2-67bb929c01d7" xlink:to="loc_us-gaap_CommonStockSharesIssued_019cd350-826b-7de0-be40-79d8458402f1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019cd350-826b-7de3-a84e-ccf2d0a28090" 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_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019cd350-826b-727e-bce2-67bb929c01d7" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019cd350-826b-7de3-a84e-ccf2d0a28090" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/CondensedConsolidatedStatementsofStockholdersEquityUnaudited" xlink:type="simple" xlink:href="hims-20260331.xsd#CondensedConsolidatedStatementsofStockholdersEquityUnaudited"/>
  <link:definitionLink xlink:role="http://forhims.com/role/CondensedConsolidatedStatementsofStockholdersEquityUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019cd350-826b-7cd4-8307-1785efe08b1f" 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_019cd350-826b-7416-aec2-d504c22c98ac" 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_019cd350-826b-7cd4-8307-1785efe08b1f" xlink:to="loc_us-gaap_StatementTable_019cd350-826b-7416-aec2-d504c22c98ac" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019cd350-826b-7ada-9009-5ad51a1ffcdf" 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_019cd350-826b-7416-aec2-d504c22c98ac" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019cd350-826b-7ada-9009-5ad51a1ffcdf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cd350-826b-7ada-9009-5ad51a1ffcdf_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_019cd350-826b-7ada-9009-5ad51a1ffcdf" xlink:to="loc_us-gaap_EquityComponentDomain_019cd350-826b-7ada-9009-5ad51a1ffcdf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cd350-826b-70a9-9559-e6e924a00fb7" 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_019cd350-826b-7ada-9009-5ad51a1ffcdf" xlink:to="loc_us-gaap_EquityComponentDomain_019cd350-826b-70a9-9559-e6e924a00fb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019cd350-826b-7c51-83ad-12ee08abfd5b" 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_019cd350-826b-70a9-9559-e6e924a00fb7" xlink:to="loc_us-gaap_CommonStockMember_019cd350-826b-7c51-83ad-12ee08abfd5b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019cd350-826b-791f-a13e-53a65b0dff4e" 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_019cd350-826b-70a9-9559-e6e924a00fb7" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019cd350-826b-791f-a13e-53a65b0dff4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019cd350-826b-75ae-8135-b975c565ef24" 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_019cd350-826b-70a9-9559-e6e924a00fb7" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019cd350-826b-75ae-8135-b975c565ef24" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019cd350-826b-7798-85eb-fd3e1cc49320" 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_019cd350-826b-70a9-9559-e6e924a00fb7" xlink:to="loc_us-gaap_RetainedEarningsMember_019cd350-826b-7798-85eb-fd3e1cc49320" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cd350-826b-75ae-823d-39faa08e7c54" 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_019cd350-826b-7cd4-8307-1785efe08b1f" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cd350-826b-75ae-823d-39faa08e7c54" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_019cd350-826b-7b6e-9ef9-7b132a7e26ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cd350-826b-75ae-823d-39faa08e7c54" xlink:to="loc_us-gaap_SharesOutstanding_019cd350-826b-7b6e-9ef9-7b132a7e26ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019cd350-826b-71a6-bbf4-96c060067d97" 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_019cd350-826b-75ae-823d-39faa08e7c54" xlink:to="loc_us-gaap_StockholdersEquity_019cd350-826b-71a6-bbf4-96c060067d97" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfSharesWithholdingsForTaxes_019cd350-826b-7c89-9107-d115630495e5" xlink:href="hims-20260331.xsd#hims_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfSharesWithholdingsForTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cd350-826b-75ae-823d-39faa08e7c54" xlink:to="loc_hims_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfSharesWithholdingsForTaxes_019cd350-826b-7c89-9107-d115630495e5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedPaymentArrangementPaymentForTaxesRelatedToNetShareSettlementOfEquityAwards_019cd350-826b-7338-b81d-59ffe3949956" xlink:href="hims-20260331.xsd#hims_ShareBasedPaymentArrangementPaymentForTaxesRelatedToNetShareSettlementOfEquityAwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cd350-826b-75ae-823d-39faa08e7c54" xlink:to="loc_hims_ShareBasedPaymentArrangementPaymentForTaxesRelatedToNetShareSettlementOfEquityAwards_019cd350-826b-7338-b81d-59ffe3949956" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019cd350-826b-7381-a850-2a9212cffa49" 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_019cd350-826b-75ae-823d-39faa08e7c54" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019cd350-826b-7381-a850-2a9212cffa49" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_019cd350-826b-7847-a617-bcbb853af292" 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_019cd350-826b-75ae-823d-39faa08e7c54" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_019cd350-826b-7847-a617-bcbb853af292" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesOther_019dfebd-a96b-785c-8eb2-899070bbb02f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cd350-826b-75ae-823d-39faa08e7c54" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesOther_019dfebd-a96b-785c-8eb2-899070bbb02f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_StockIssuedDuringPeriodSharesAcquisitionOfAssets_019d1bed-bfcf-7a19-a62f-547ac01cc5fb" xlink:href="hims-20260331.xsd#hims_StockIssuedDuringPeriodSharesAcquisitionOfAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cd350-826b-75ae-823d-39faa08e7c54" xlink:to="loc_hims_StockIssuedDuringPeriodSharesAcquisitionOfAssets_019d1bed-bfcf-7a19-a62f-547ac01cc5fb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_StockIssuedDuringPeriodValueAcquisitionOfAssets_019d1bed-f636-76ba-b63f-56ac62437bca" xlink:href="hims-20260331.xsd#hims_StockIssuedDuringPeriodValueAcquisitionOfAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cd350-826b-75ae-823d-39faa08e7c54" xlink:to="loc_hims_StockIssuedDuringPeriodValueAcquisitionOfAssets_019d1bed-f636-76ba-b63f-56ac62437bca" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019cd350-826b-7b08-aa20-71ec8a377251" 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_019cd350-826b-75ae-823d-39faa08e7c54" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019cd350-826b-7b08-aa20-71ec8a377251" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019cd350-826b-7aac-8d72-ad93d6097fe2" 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_IncreaseDecreaseInStockholdersEquityRollForward_019cd350-826b-75ae-823d-39faa08e7c54" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019cd350-826b-7aac-8d72-ad93d6097fe2" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_StockToBeIssuedValueOther_019cd350-826b-7001-8642-577da68aee54" xlink:href="hims-20260331.xsd#hims_StockToBeIssuedValueOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cd350-826b-75ae-823d-39faa08e7c54" xlink:to="loc_hims_StockToBeIssuedValueOther_019cd350-826b-7001-8642-577da68aee54" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019cd350-826b-7711-9148-e409c16fb7d9" 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_019cd350-826b-75ae-823d-39faa08e7c54" xlink:to="loc_us-gaap_NetIncomeLoss_019cd350-826b-7711-9148-e409c16fb7d9" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_019cd350-826b-74da-8a6f-541c7202e793" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019cd350-826b-757d-a2db-43a4a605e5c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/SummaryofSignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#SummaryofSignificantAccountingPoliciesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/SummaryofSignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019cd350-826b-7808-b198-f56a6f097c6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019cd350-826b-7690-802c-8c4d38dc046f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cd350-826b-7808-b198-f56a6f097c6e" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019cd350-826b-7690-802c-8c4d38dc046f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019cd350-826b-7978-aef4-3786be2db046" 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_DisaggregationOfRevenueTable_019cd350-826b-7690-802c-8c4d38dc046f" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019cd350-826b-7978-aef4-3786be2db046" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-826b-7978-aef4-3786be2db046_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_019cd350-826b-7978-aef4-3786be2db046" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-826b-7978-aef4-3786be2db046_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-826b-72fe-831c-9c63a0376fde" 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_019cd350-826b-7978-aef4-3786be2db046" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-826b-72fe-831c-9c63a0376fde" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_YourBioHealthInc.Member_019dfec4-f3d7-7aa3-a8bb-617d053f348f" xlink:href="hims-20260331.xsd#hims_YourBioHealthInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-826b-72fe-831c-9c63a0376fde" xlink:to="loc_hims_YourBioHealthInc.Member_019dfec4-f3d7-7aa3-a8bb-617d053f348f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_019df9a7-ac7b-71e3-83af-01ccea1d4d42" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019cd350-826b-7690-802c-8c4d38dc046f" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_019df9a7-ac7b-71e3-83af-01ccea1d4d42" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_019df9a7-ac7b-71e3-83af-01ccea1d4d42_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_019df9a7-ac7b-71e3-83af-01ccea1d4d42" xlink:to="loc_us-gaap_ReceivableTypeDomain_019df9a7-ac7b-71e3-83af-01ccea1d4d42_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_019df9a7-ac7b-7d24-afa7-b3f38b3bb62c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_019df9a7-ac7b-71e3-83af-01ccea1d4d42" xlink:to="loc_us-gaap_ReceivableTypeDomain_019df9a7-ac7b-7d24-afa7-b3f38b3bb62c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ManufacturersDiscountAndRebateReceivableMember_019df9a7-d5d6-7769-8e3c-090e2122de94" xlink:href="hims-20260331.xsd#hims_ManufacturersDiscountAndRebateReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_019df9a7-ac7b-7d24-afa7-b3f38b3bb62c" xlink:to="loc_hims_ManufacturersDiscountAndRebateReceivableMember_019df9a7-d5d6-7769-8e3c-090e2122de94" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_019df9a7-6db0-7856-b774-05717178fd8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cd350-826b-7808-b198-f56a6f097c6e" xlink:to="loc_us-gaap_ReceivablesNetCurrent_019df9a7-6db0-7856-b774-05717178fd8a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportingUnits_019cd350-826b-7325-9033-158064bb69c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfReportingUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cd350-826b-7808-b198-f56a6f097c6e" xlink:to="loc_us-gaap_NumberOfReportingUnits_019cd350-826b-7325-9033-158064bb69c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_019cd350-826b-76cf-9995-c7bcfc613558" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cd350-826b-7808-b198-f56a6f097c6e" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_019cd350-826b-76cf-9995-c7bcfc613558" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_019cd350-826b-7536-afd5-5f2e8770a109" 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_DisaggregationOfRevenueLineItems_019cd350-826b-7808-b198-f56a6f097c6e" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_019cd350-826b-7536-afd5-5f2e8770a109" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_019cd350-826b-769b-a748-94fa094c01e5" 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_DisaggregationOfRevenueLineItems_019cd350-826b-7808-b198-f56a6f097c6e" xlink:to="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_019cd350-826b-769b-a748-94fa094c01e5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_NumberOfAssetGroups_019d1cf4-5402-79c0-8061-c1e94b976dd3" xlink:href="hims-20260331.xsd#hims_NumberOfAssetGroups"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cd350-826b-7808-b198-f56a6f097c6e" xlink:to="loc_hims_NumberOfAssetGroups_019d1cf4-5402-79c0-8061-c1e94b976dd3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019cd350-826b-76f3-824a-685669faa402" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cd350-826b-7808-b198-f56a6f097c6e" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019cd350-826b-76f3-824a-685669faa402" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ContractWithCustomerLiabilityPeriodIncreaseDecrease_019cd350-826b-76b3-868c-13190115d812" xlink:href="hims-20260331.xsd#hims_ContractWithCustomerLiabilityPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cd350-826b-7808-b198-f56a6f097c6e" xlink:to="loc_hims_ContractWithCustomerLiabilityPeriodIncreaseDecrease_019cd350-826b-76b3-868c-13190115d812" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/SummaryofSignificantAccountingPoliciesRevenueRecognitionDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#SummaryofSignificantAccountingPoliciesRevenueRecognitionDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/SummaryofSignificantAccountingPoliciesRevenueRecognitionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019cd350-826b-776f-8868-6c8328f90a2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019cd350-826b-734f-bde9-4aad2535e276" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cd350-826b-776f-8868-6c8328f90a2f" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019cd350-826b-734f-bde9-4aad2535e276" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019d1bff-b450-704a-97e0-52c0b8e40fe8" 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_DisaggregationOfRevenueTable_019cd350-826b-734f-bde9-4aad2535e276" xlink:to="loc_srt_StatementGeographicalAxis_019d1bff-b450-704a-97e0-52c0b8e40fe8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019d1bff-b450-704a-97e0-52c0b8e40fe8_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_019d1bff-b450-704a-97e0-52c0b8e40fe8" xlink:to="loc_srt_SegmentGeographicalDomain_019d1bff-b450-704a-97e0-52c0b8e40fe8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019d1bff-b450-73a0-9cc0-ced46a509426" 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_019d1bff-b450-704a-97e0-52c0b8e40fe8" xlink:to="loc_srt_SegmentGeographicalDomain_019d1bff-b450-73a0-9cc0-ced46a509426" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019d1bff-b450-7019-8110-44c584d61ff7" 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_019d1bff-b450-73a0-9cc0-ced46a509426" xlink:to="loc_country_US_019d1bff-b450-7019-8110-44c584d61ff7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_019d1bff-b450-7a55-a25b-e013a35a618b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019d1bff-b450-73a0-9cc0-ced46a509426" xlink:to="loc_us-gaap_NonUsMember_019d1bff-b450-7a55-a25b-e013a35a618b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019cd350-826b-73b1-a17a-c8aea6951699" 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_DisaggregationOfRevenueLineItems_019cd350-826b-776f-8868-6c8328f90a2f" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019cd350-826b-73b1-a17a-c8aea6951699" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/SummaryofSignificantAccountingPoliciesRestructuringandOtherRelatedChargesDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#SummaryofSignificantAccountingPoliciesRestructuringandOtherRelatedChargesDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/SummaryofSignificantAccountingPoliciesRestructuringandOtherRelatedChargesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019dd197-01e0-71a7-b9cc-b0f13ff1b219" 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_019dd197-01e0-7441-babc-ad353011c9e0" 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_019dd197-01e0-71a7-b9cc-b0f13ff1b219" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dd197-01e0-7441-babc-ad353011c9e0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_019dd197-01e0-78d4-9f42-e88773abe169" 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_ScheduleOfRestructuringAndRelatedCostsTable_019dd197-01e0-7441-babc-ad353011c9e0" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_019dd197-01e0-78d4-9f42-e88773abe169" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019dd197-01e0-78d4-9f42-e88773abe169_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_019dd197-01e0-78d4-9f42-e88773abe169" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019dd197-01e0-78d4-9f42-e88773abe169_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019dd197-01e0-7e27-86e6-54503114b152" 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_019dd197-01e0-78d4-9f42-e88773abe169" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019dd197-01e0-7e27-86e6-54503114b152" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_019df9a2-b7b8-7a81-a320-3674b694d313" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019dd197-01e0-7e27-86e6-54503114b152" xlink:to="loc_us-gaap_CostOfSalesMember_019df9a2-b7b8-7a81-a320-3674b694d313" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_OperationsAndSupportMember_019dd197-01e0-7120-b9ee-e44b4a89967f" xlink:href="hims-20260331.xsd#hims_OperationsAndSupportMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019dd197-01e0-7e27-86e6-54503114b152" xlink:to="loc_hims_OperationsAndSupportMember_019dd197-01e0-7120-b9ee-e44b4a89967f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostIncurredCost_019dd197-01e0-7afb-bbae-506393e11fd4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringAndRelatedCostIncurredCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dd197-01e0-71a7-b9cc-b0f13ff1b219" xlink:to="loc_us-gaap_RestructuringAndRelatedCostIncurredCost_019dd197-01e0-7afb-bbae-506393e11fd4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/AcquisitionsNarrativeDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#AcquisitionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/AcquisitionsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7228-9bb9-47d1a0d6022a" 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_019cd350-826b-7f6b-867c-d50819f7a02a" 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_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cd350-826b-7f6b-867c-d50819f7a02a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019cd350-826b-7dc3-ad95-c78777a3c014" 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_019cd350-826b-7f6b-867c-d50819f7a02a" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019cd350-826b-7dc3-ad95-c78777a3c014" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-826b-7dc3-ad95-c78777a3c014_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_019cd350-826b-7dc3-ad95-c78777a3c014" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-826b-7dc3-ad95-c78777a3c014_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832c-7098-a475-cd7393f42c61" 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_019cd350-826b-7dc3-ad95-c78777a3c014" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832c-7098-a475-cd7393f42c61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_EUCManagementPtyLtd.Member_019d1c1d-b6fd-79c3-afd4-33d275505a5c" xlink:href="hims-20260331.xsd#hims_EUCManagementPtyLtd.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832c-7098-a475-cd7393f42c61" xlink:to="loc_hims_EUCManagementPtyLtd.Member_019d1c1d-b6fd-79c3-afd4-33d275505a5c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_YourBioHealthInc.Member_019d1c12-e7e6-728d-aa7b-f3c14c4d3058" xlink:href="hims-20260331.xsd#hims_YourBioHealthInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832c-7098-a475-cd7393f42c61" xlink:to="loc_hims_YourBioHealthInc.Member_019d1c12-e7e6-728d-aa7b-f3c14c4d3058" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_MediciTechnologiesIncDbaLivewellMember_019d1c02-1cdf-722d-98a0-b8aaf5ba40ad" xlink:href="hims-20260331.xsd#hims_MediciTechnologiesIncDbaLivewellMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832c-7098-a475-cd7393f42c61" xlink:to="loc_hims_MediciTechnologiesIncDbaLivewellMember_019d1c02-1cdf-722d-98a0-b8aaf5ba40ad" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ZavaGlobalGmbHMember_019cd350-832c-7e87-8858-4bcdd1de62e9" xlink:href="hims-20260331.xsd#hims_ZavaGlobalGmbHMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832c-7098-a475-cd7393f42c61" xlink:to="loc_hims_ZavaGlobalGmbHMember_019cd350-832c-7e87-8858-4bcdd1de62e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_SigmundNJLLCTrybeLabsMember_019cd350-832c-708b-b1ed-b8db5aac59e2" xlink:href="hims-20260331.xsd#hims_SigmundNJLLCTrybeLabsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832c-7098-a475-cd7393f42c61" xlink:to="loc_hims_SigmundNJLLCTrybeLabsMember_019cd350-832c-708b-b1ed-b8db5aac59e2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionAxis_019cd350-832c-7d6a-812c-b4255a7456e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cd350-826b-7f6b-867c-d50819f7a02a" xlink:to="loc_us-gaap_AssetAcquisitionAxis_019cd350-832c-7d6a-812c-b4255a7456e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionDomain_019cd350-832c-7d6a-812c-b4255a7456e8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetAcquisitionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AssetAcquisitionAxis_019cd350-832c-7d6a-812c-b4255a7456e8" xlink:to="loc_us-gaap_AssetAcquisitionDomain_019cd350-832c-7d6a-812c-b4255a7456e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionDomain_019cd350-832c-7227-b676-742fc9997413" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetAcquisitionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AssetAcquisitionAxis_019cd350-832c-7d6a-812c-b4255a7456e8" xlink:to="loc_us-gaap_AssetAcquisitionDomain_019cd350-832c-7227-b676-742fc9997413" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_CSBioCo.Member_019cd350-832c-7295-b92b-44aae0c55157" xlink:href="hims-20260331.xsd#hims_CSBioCo.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetAcquisitionDomain_019cd350-832c-7227-b676-742fc9997413" xlink:to="loc_hims_CSBioCo.Member_019cd350-832c-7295-b92b-44aae0c55157" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019cd350-832c-78c3-94cd-8b0d8620eb9b" 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_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cd350-826b-7f6b-867c-d50819f7a02a" xlink:to="loc_srt_RangeAxis_019cd350-832c-78c3-94cd-8b0d8620eb9b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd350-832c-78c3-94cd-8b0d8620eb9b_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_019cd350-832c-78c3-94cd-8b0d8620eb9b" xlink:to="loc_srt_RangeMember_019cd350-832c-78c3-94cd-8b0d8620eb9b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd350-832c-72a7-b1ac-fb9e667b4401" 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_019cd350-832c-78c3-94cd-8b0d8620eb9b" xlink:to="loc_srt_RangeMember_019cd350-832c-72a7-b1ac-fb9e667b4401" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019cd350-832c-71a5-8504-3fae84ab7a39" 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_019cd350-832c-72a7-b1ac-fb9e667b4401" xlink:to="loc_srt_MaximumMember_019cd350-832c-71a5-8504-3fae84ab7a39" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019d1c1e-17e1-7ddf-a1e4-52cb0d1dc0f8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cd350-826b-7f6b-867c-d50819f7a02a" xlink:to="loc_dei_LegalEntityAxis_019d1c1e-17e1-7ddf-a1e4-52cb0d1dc0f8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019d1c1e-17e1-7ddf-a1e4-52cb0d1dc0f8_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019d1c1e-17e1-7ddf-a1e4-52cb0d1dc0f8" xlink:to="loc_dei_EntityDomain_019d1c1e-17e1-7ddf-a1e4-52cb0d1dc0f8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019d1c1e-17e1-73a7-a5f7-368eeb9fc2e8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019d1c1e-17e1-7ddf-a1e4-52cb0d1dc0f8" xlink:to="loc_dei_EntityDomain_019d1c1e-17e1-73a7-a5f7-368eeb9fc2e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_HorizonBidCoPtyLtdMember_019d1c1e-17e1-7325-9dbe-e3bf44e0081f" xlink:href="hims-20260331.xsd#hims_HorizonBidCoPtyLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019d1c1e-17e1-73a7-a5f7-368eeb9fc2e8" xlink:to="loc_hims_HorizonBidCoPtyLtdMember_019d1c1e-17e1-7325-9dbe-e3bf44e0081f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019d1c1e-17e1-7dc3-9442-a4d7d6c3400b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cd350-826b-7f6b-867c-d50819f7a02a" xlink:to="loc_srt_StatementScenarioAxis_019d1c1e-17e1-7dc3-9442-a4d7d6c3400b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019d1c1e-17e1-7dc3-9442-a4d7d6c3400b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_019d1c1e-17e1-7dc3-9442-a4d7d6c3400b" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019d1c1e-17e1-7dc3-9442-a4d7d6c3400b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019d1c1e-17e1-782a-b542-aed5daa8e559" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_019d1c1e-17e1-7dc3-9442-a4d7d6c3400b" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019d1c1e-17e1-782a-b542-aed5daa8e559" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_019d1c1e-17e1-722d-bfde-ad2148f93bec" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_019d1c1e-17e1-782a-b542-aed5daa8e559" xlink:to="loc_srt_ScenarioForecastMember_019d1c1e-17e1-722d-bfde-ad2148f93bec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_019d1c1e-17e1-7ca3-8035-55d15bece723" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cd350-826b-7f6b-867c-d50819f7a02a" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_019d1c1e-17e1-7ca3-8035-55d15bece723" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019d1c1e-17e1-7ca3-8035-55d15bece723_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_019d1c1e-17e1-7ca3-8035-55d15bece723" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019d1c1e-17e1-7ca3-8035-55d15bece723_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019d1c1e-17e1-795c-8deb-b6d732894175" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_019d1c1e-17e1-7ca3-8035-55d15bece723" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019d1c1e-17e1-795c-8deb-b6d732894175" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DeferredPaymentsMember_019d1c1e-17e1-7815-a73e-06fd60f227f0" xlink:href="hims-20260331.xsd#hims_DeferredPaymentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019d1c1e-17e1-795c-8deb-b6d732894175" xlink:to="loc_hims_DeferredPaymentsMember_019d1c1e-17e1-7815-a73e-06fd60f227f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_EarnOutPaymentsMember_019d1c1e-17e1-7754-bff5-a7e92c5c5c31" xlink:href="hims-20260331.xsd#hims_EarnOutPaymentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019d1c1e-17e1-795c-8deb-b6d732894175" xlink:to="loc_hims_EarnOutPaymentsMember_019d1c1e-17e1-7754-bff5-a7e92c5c5c31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019d1c1e-17e1-7fe1-8b90-92a17d120a48" 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_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cd350-826b-7f6b-867c-d50819f7a02a" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019d1c1e-17e1-7fe1-8b90-92a17d120a48" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019d1c1e-17e1-7fe1-8b90-92a17d120a48_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_019d1c1e-17e1-7fe1-8b90-92a17d120a48" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019d1c1e-17e1-7fe1-8b90-92a17d120a48_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019d1c1e-17e1-787f-911b-b61e90b43e2c" 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_019d1c1e-17e1-7fe1-8b90-92a17d120a48" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019d1c1e-17e1-787f-911b-b61e90b43e2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019d1c1e-17e1-70ae-934d-63d230ca66ac" 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_019d1c1e-17e1-787f-911b-b61e90b43e2c" xlink:to="loc_us-gaap_SubsequentEventMember_019d1c1e-17e1-70ae-934d-63d230ca66ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019d1d01-95d3-79ae-b943-5709905d7683" 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_019cd350-826b-7f6b-867c-d50819f7a02a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019d1d01-95d3-79ae-b943-5709905d7683" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d1d01-95d3-79ae-b943-5709905d7683_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_019d1d01-95d3-79ae-b943-5709905d7683" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d1d01-95d3-79ae-b943-5709905d7683_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d1d01-95d3-7f42-9d68-e919278db63e" 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_019d1d01-95d3-79ae-b943-5709905d7683" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d1d01-95d3-7f42-9d68-e919278db63e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DevelopedIntellectualPropertyMember_019dff40-ddb9-73b3-b640-36738fac58ae" xlink:href="hims-20260331.xsd#hims_DevelopedIntellectualPropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d1d01-95d3-7f42-9d68-e919278db63e" xlink:to="loc_hims_DevelopedIntellectualPropertyMember_019dff40-ddb9-73b3-b640-36738fac58ae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_019d1d01-95d3-7de2-a663-13dfbfea38ba" 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_019d1d01-95d3-7f42-9d68-e919278db63e" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_019d1d01-95d3-7de2-a663-13dfbfea38ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationPriceOfAcquisitionExpected_019e08d4-0f0d-7251-9c82-57a43a51a1ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationPriceOfAcquisitionExpected"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_us-gaap_BusinessCombinationPriceOfAcquisitionExpected_019e08d4-0f0d-7251-9c82-57a43a51a1ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019d1c1e-17e1-78f9-baa4-6124233e4700" 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_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019d1c1e-17e1-78f9-baa4-6124233e4700" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_BusinessCombinationDeferredPaymentLiability_019d1c1e-17e1-7644-8a6a-c88763c7308a" xlink:href="hims-20260331.xsd#hims_BusinessCombinationDeferredPaymentLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_hims_BusinessCombinationDeferredPaymentLiability_019d1c1e-17e1-7644-8a6a-c88763c7308a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_BusinessCombinationContingentConsiderationLiabilityNumberOfQuarterlyPaymentInstallments_019d1c1e-17e1-7f62-a4ea-0271c3ff5dd7" xlink:href="hims-20260331.xsd#hims_BusinessCombinationContingentConsiderationLiabilityNumberOfQuarterlyPaymentInstallments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_hims_BusinessCombinationContingentConsiderationLiabilityNumberOfQuarterlyPaymentInstallments_019d1c1e-17e1-7f62-a4ea-0271c3ff5dd7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_BusinessCombinationContingentConsiderationLiabilityPeriodOfExpectedPaymentPeriodPostClosing_019d1c73-4d37-7569-acd1-86c31988416f" xlink:href="hims-20260331.xsd#hims_BusinessCombinationContingentConsiderationLiabilityPeriodOfExpectedPaymentPeriodPostClosing"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_hims_BusinessCombinationContingentConsiderationLiabilityPeriodOfExpectedPaymentPeriodPostClosing_019d1c73-4d37-7569-acd1-86c31988416f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019d1c1e-17e1-7a31-b60f-5e097f3bc14a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019d1c1e-17e1-7a31-b60f-5e097f3bc14a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019d1c1e-f5f0-7be0-878c-41fa073edc98" 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_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019d1c1e-f5f0-7be0-878c-41fa073edc98" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_BusinessCombinationConsiderationNotYetPaidSubjectToEarnOutConditions_019d1c20-45a1-791e-9098-2a68a67b24bf" xlink:href="hims-20260331.xsd#hims_BusinessCombinationConsiderationNotYetPaidSubjectToEarnOutConditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_hims_BusinessCombinationConsiderationNotYetPaidSubjectToEarnOutConditions_019d1c20-45a1-791e-9098-2a68a67b24bf" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_BusinessCombinationContingentConsiderationNotYetPaidMetricMeasurementTerm_019df9b0-aecd-7a32-85d1-f75cbd971692" xlink:href="hims-20260331.xsd#hims_BusinessCombinationContingentConsiderationNotYetPaidMetricMeasurementTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_hims_BusinessCombinationContingentConsiderationNotYetPaidMetricMeasurementTerm_019df9b0-aecd-7a32-85d1-f75cbd971692" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_019d1c77-b39a-7d5b-a208-0986a57941fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_019d1c77-b39a-7d5b-a208-0986a57941fa" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019d1c21-7576-71b4-b132-945e320c9c80" 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_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_us-gaap_Goodwill_019d1c21-7576-71b4-b132-945e320c9c80" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019d1c21-7576-7a76-88f2-f2df0b4ed12a" 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_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019d1c21-7576-7a76-88f2-f2df0b4ed12a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_BusinessCombinationConsiderationNotYetPaid_019d1c21-9158-77e0-a584-e6e42ecd369f" xlink:href="hims-20260331.xsd#hims_BusinessCombinationConsiderationNotYetPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_hims_BusinessCombinationConsiderationNotYetPaid_019d1c21-9158-77e0-a584-e6e42ecd369f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_019d1c21-d971-73ec-b3ff-e411a204263c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_019d1c21-d971-73ec-b3ff-e411a204263c" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionConsiderationTransferred_019d1c22-4c36-79bf-b044-19a93a9cad58" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetAcquisitionConsiderationTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_us-gaap_AssetAcquisitionConsiderationTransferred_019d1c22-4c36-79bf-b044-19a93a9cad58" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_PaymentsForAssetAcquisitions_019d1c22-4c36-7407-907a-4f29bc332b06" xlink:href="hims-20260331.xsd#hims_PaymentsForAssetAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_hims_PaymentsForAssetAcquisitions_019d1c22-4c36-7407-907a-4f29bc332b06" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionConsiderationTransferredContingentConsideration_019d1c22-4c36-75c0-bbc8-f6b101275814" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetAcquisitionConsiderationTransferredContingentConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_us-gaap_AssetAcquisitionConsiderationTransferredContingentConsideration_019d1c22-4c36-75c0-bbc8-f6b101275814" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_AssetAcquisitionConsiderationTransferredContingentConsiderationEarnOutConsideration_019d1c22-4c36-7a8f-ad33-2003a16f61f1" xlink:href="hims-20260331.xsd#hims_AssetAcquisitionConsiderationTransferredContingentConsiderationEarnOutConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_hims_AssetAcquisitionConsiderationTransferredContingentConsiderationEarnOutConsideration_019d1c22-4c36-7a8f-ad33-2003a16f61f1" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionConsiderationTransferredTransactionCost_019d1c22-7d6e-798d-b776-907aa05ffd97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetAcquisitionConsiderationTransferredTransactionCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7228-9bb9-47d1a0d6022a" xlink:to="loc_us-gaap_AssetAcquisitionConsiderationTransferredTransactionCost_019d1c22-7d6e-798d-b776-907aa05ffd97" xlink:type="arc" order="18"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/AcquisitionsYourBioAcquisitionDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#AcquisitionsYourBioAcquisitionDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/AcquisitionsYourBioAcquisitionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019d1c22-e561-7f55-bd8a-3e7ba1ce3493" 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_019d1c22-e561-72b4-8f4f-8d3ee392d96d" 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_019d1c22-e561-7f55-bd8a-3e7ba1ce3493" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019d1c22-e561-72b4-8f4f-8d3ee392d96d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019d1c22-e561-7993-b7f6-2ee77228608b" 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_019d1c22-e561-72b4-8f4f-8d3ee392d96d" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019d1c22-e561-7993-b7f6-2ee77228608b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d1c22-e561-7993-b7f6-2ee77228608b_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_019d1c22-e561-7993-b7f6-2ee77228608b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d1c22-e561-7993-b7f6-2ee77228608b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d1c22-e561-76f3-b1a8-d2df529ca727" 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_019d1c22-e561-7993-b7f6-2ee77228608b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d1c22-e561-76f3-b1a8-d2df529ca727" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_YourBioHealthInc.Member_019d1c22-e561-77a9-aecb-a64131d032ca" xlink:href="hims-20260331.xsd#hims_YourBioHealthInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d1c22-e561-76f3-b1a8-d2df529ca727" xlink:to="loc_hims_YourBioHealthInc.Member_019d1c22-e561-77a9-aecb-a64131d032ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019d1c22-e561-798b-b40a-11cc3d47c9e9" 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_019d1c22-e561-72b4-8f4f-8d3ee392d96d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019d1c22-e561-798b-b40a-11cc3d47c9e9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d1c22-e561-798b-b40a-11cc3d47c9e9_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_019d1c22-e561-798b-b40a-11cc3d47c9e9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d1c22-e561-798b-b40a-11cc3d47c9e9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d1c22-e561-712a-9d6c-0c399ccad352" 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_019d1c22-e561-798b-b40a-11cc3d47c9e9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d1c22-e561-712a-9d6c-0c399ccad352" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DevelopedIntellectualPropertyMember_019dfece-f783-76a2-899d-048638835d2a" xlink:href="hims-20260331.xsd#hims_DevelopedIntellectualPropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d1c22-e561-712a-9d6c-0c399ccad352" xlink:to="loc_hims_DevelopedIntellectualPropertyMember_019dfece-f783-76a2-899d-048638835d2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019d1c22-e561-724f-acf7-8d762dba1b9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019d1c22-e561-7f55-bd8a-3e7ba1ce3493" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019d1c22-e561-724f-acf7-8d762dba1b9f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019d1c22-e561-78a4-a682-9cac0dd6a75b" 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_019d1c22-e561-7f55-bd8a-3e7ba1ce3493" xlink:to="loc_us-gaap_Goodwill_019d1c22-e561-78a4-a682-9cac0dd6a75b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilitiesNet_019d1c22-e561-79d5-a223-7712535dd5ab" xlink:href="hims-20260331.xsd#hims_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019d1c22-e561-7f55-bd8a-3e7ba1ce3493" xlink:to="loc_hims_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilitiesNet_019d1c22-e561-79d5-a223-7712535dd5ab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019d1c22-e561-7d3b-ac4f-84685c08f57b" 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_019d1c22-e561-7f55-bd8a-3e7ba1ce3493" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019d1c22-e561-7d3b-ac4f-84685c08f57b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/AcquisitionsMediciTechnologiesIncAcquisitionDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#AcquisitionsMediciTechnologiesIncAcquisitionDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/AcquisitionsMediciTechnologiesIncAcquisitionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019d1c25-2f2a-7975-bbc3-b46b8bbfed1e" 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_019d1c25-2f2a-79b4-ac8e-bd929ebf522e" 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_019d1c25-2f2a-7975-bbc3-b46b8bbfed1e" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019d1c25-2f2a-79b4-ac8e-bd929ebf522e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019d1c25-2f2a-7ade-a845-d3fc4e1cf3b5" 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_019d1c25-2f2a-79b4-ac8e-bd929ebf522e" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019d1c25-2f2a-7ade-a845-d3fc4e1cf3b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d1c25-2f2a-7ade-a845-d3fc4e1cf3b5_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_019d1c25-2f2a-7ade-a845-d3fc4e1cf3b5" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d1c25-2f2a-7ade-a845-d3fc4e1cf3b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d1c25-2f2a-71b3-8bd8-698cb3e0c81c" 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_019d1c25-2f2a-7ade-a845-d3fc4e1cf3b5" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d1c25-2f2a-71b3-8bd8-698cb3e0c81c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_MediciTechnologiesIncDbaLivewellMember_019d1c25-2f2a-7677-81f1-3f5b5c6f6126" xlink:href="hims-20260331.xsd#hims_MediciTechnologiesIncDbaLivewellMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d1c25-2f2a-71b3-8bd8-698cb3e0c81c" xlink:to="loc_hims_MediciTechnologiesIncDbaLivewellMember_019d1c25-2f2a-7677-81f1-3f5b5c6f6126" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019d1c25-2f2a-7c0a-9661-2d98a76d3a77" 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_019d1c25-2f2a-79b4-ac8e-bd929ebf522e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019d1c25-2f2a-7c0a-9661-2d98a76d3a77" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d1c25-2f2a-7c0a-9661-2d98a76d3a77_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_019d1c25-2f2a-7c0a-9661-2d98a76d3a77" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d1c25-2f2a-7c0a-9661-2d98a76d3a77_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d1c25-2f2a-7087-a8a3-61ac127b6718" 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_019d1c25-2f2a-7c0a-9661-2d98a76d3a77" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d1c25-2f2a-7087-a8a3-61ac127b6718" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019d1c25-2f2a-7480-9a99-ae903e578c35" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d1c25-2f2a-7087-a8a3-61ac127b6718" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019d1c25-2f2a-7480-9a99-ae903e578c35" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_019d1c25-2f2a-7ad7-a446-fa2572df8bf9" 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_019d1c25-2f2a-7087-a8a3-61ac127b6718" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_019d1c25-2f2a-7ad7-a446-fa2572df8bf9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_019d1c25-2f2a-7037-81d4-6c0be6fcb1bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d1c25-2f2a-7087-a8a3-61ac127b6718" xlink:to="loc_us-gaap_TradeNamesMember_019d1c25-2f2a-7037-81d4-6c0be6fcb1bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019d1c25-2f2a-78d7-9ff6-13b25f65a913" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019d1c25-2f2a-7975-bbc3-b46b8bbfed1e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019d1c25-2f2a-78d7-9ff6-13b25f65a913" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019d1c25-2f2a-7d84-8b8b-b312c0400a18" 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_019d1c25-2f2a-7975-bbc3-b46b8bbfed1e" xlink:to="loc_us-gaap_Goodwill_019d1c25-2f2a-7d84-8b8b-b312c0400a18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilitiesNet_019d1c25-2f2a-712d-9996-89859c50b95c" xlink:href="hims-20260331.xsd#hims_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019d1c25-2f2a-7975-bbc3-b46b8bbfed1e" xlink:to="loc_hims_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilitiesNet_019d1c25-2f2a-712d-9996-89859c50b95c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019d1c25-2f2a-75c0-9885-5f614c05b0df" 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_019d1c25-2f2a-7975-bbc3-b46b8bbfed1e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019d1c25-2f2a-75c0-9885-5f614c05b0df" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/AcquisitionsZavaAcquisitionDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#AcquisitionsZavaAcquisitionDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/AcquisitionsZavaAcquisitionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7633-ba6b-a87b6e28e227" 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_019cd350-832c-7c33-9aad-f715d5938117" 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_019cd350-832c-7633-ba6b-a87b6e28e227" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019cd350-832c-7c33-9aad-f715d5938117" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019cd350-832c-7761-b43e-dcb91f17aa41" 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_019cd350-832c-7c33-9aad-f715d5938117" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019cd350-832c-7761-b43e-dcb91f17aa41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832c-7761-b43e-dcb91f17aa41_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_019cd350-832c-7761-b43e-dcb91f17aa41" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832c-7761-b43e-dcb91f17aa41_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832c-7012-863e-a031a4c6cea9" 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_019cd350-832c-7761-b43e-dcb91f17aa41" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832c-7012-863e-a031a4c6cea9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ZavaGlobalGmbHMember_019cd350-832c-7c41-9d66-6643e14cb7bc" xlink:href="hims-20260331.xsd#hims_ZavaGlobalGmbHMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832c-7012-863e-a031a4c6cea9" xlink:to="loc_hims_ZavaGlobalGmbHMember_019cd350-832c-7c41-9d66-6643e14cb7bc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cd350-832c-77d5-b969-4adcd2e16a91" 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_019cd350-832c-7c33-9aad-f715d5938117" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cd350-832c-77d5-b969-4adcd2e16a91" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cd350-832c-77d5-b969-4adcd2e16a91_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_019cd350-832c-77d5-b969-4adcd2e16a91" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cd350-832c-77d5-b969-4adcd2e16a91_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cd350-832c-7885-a517-4addde82af80" 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_019cd350-832c-77d5-b969-4adcd2e16a91" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cd350-832c-7885-a517-4addde82af80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_PlatformPartnershipsMember_019cd350-832c-7d8d-ad38-a7fbadab897a" xlink:href="hims-20260331.xsd#hims_PlatformPartnershipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cd350-832c-7885-a517-4addde82af80" xlink:to="loc_hims_PlatformPartnershipsMember_019cd350-832c-7d8d-ad38-a7fbadab897a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_019cd350-832c-7da2-839f-55788633a979" 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_019cd350-832c-7885-a517-4addde82af80" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_019cd350-832c-7da2-839f-55788633a979" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019cd350-832c-7ba8-b694-f1e089189ec7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cd350-832c-7885-a517-4addde82af80" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019cd350-832c-7ba8-b694-f1e089189ec7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_019cd350-832c-7dd8-9fc2-7f2cf24ebc48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cd350-832c-7885-a517-4addde82af80" xlink:to="loc_us-gaap_TradeNamesMember_019cd350-832c-7dd8-9fc2-7f2cf24ebc48" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019cd350-832c-7515-ae6a-b0d9a1d381e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7633-ba6b-a87b6e28e227" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019cd350-832c-7515-ae6a-b0d9a1d381e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019cd350-832c-7172-98a6-a0020b7b60a3" 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_019cd350-832c-7633-ba6b-a87b6e28e227" xlink:to="loc_us-gaap_Goodwill_019cd350-832c-7172-98a6-a0020b7b60a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilitiesNet_019cd350-832c-7f6a-9ddb-5f99135145da" xlink:href="hims-20260331.xsd#hims_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019cd350-832c-7633-ba6b-a87b6e28e227" xlink:to="loc_hims_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilitiesNet_019cd350-832c-7f6a-9ddb-5f99135145da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019cd350-832c-7da0-b315-57c5e925477b" 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_019cd350-832c-7633-ba6b-a87b6e28e227" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019cd350-832c-7da0-b315-57c5e925477b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/InvestmentsShorttermInvestmentsDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#InvestmentsShorttermInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/InvestmentsShorttermInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketableSecuritiesLineItems_019cd350-832c-70e7-b72f-7ec604e0ffd4" 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_019cd350-832c-7c6f-a301-f961d58db92b" 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_019cd350-832c-70e7-b72f-7ec604e0ffd4" xlink:to="loc_us-gaap_MarketableSecuritiesTable_019cd350-832c-7c6f-a301-f961d58db92b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cd350-832c-74cf-a797-be9c45ae8793" 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_019cd350-832c-7c6f-a301-f961d58db92b" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cd350-832c-74cf-a797-be9c45ae8793" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cd350-832c-74cf-a797-be9c45ae8793_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_019cd350-832c-74cf-a797-be9c45ae8793" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cd350-832c-74cf-a797-be9c45ae8793_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cd350-832c-76c0-ab34-bb30e8ff0ddd" 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_019cd350-832c-74cf-a797-be9c45ae8793" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cd350-832c-76c0-ab34-bb30e8ff0ddd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_GovernmentAndGovernmentAgencyMember_019cd350-832c-7f75-874b-43397e2c146e" xlink:href="hims-20260331.xsd#hims_GovernmentAndGovernmentAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cd350-832c-76c0-ab34-bb30e8ff0ddd" xlink:to="loc_hims_GovernmentAndGovernmentAgencyMember_019cd350-832c-7f75-874b-43397e2c146e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019cd350-832c-7874-b8eb-bb3a70e03dc2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cd350-832c-76c0-ab34-bb30e8ff0ddd" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019cd350-832c-7874-b8eb-bb3a70e03dc2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryBillSecuritiesMember_019cd350-832c-75ab-a92e-2f32c4d90da3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasuryBillSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cd350-832c-76c0-ab34-bb30e8ff0ddd" xlink:to="loc_us-gaap_USTreasuryBillSecuritiesMember_019cd350-832c-75ab-a92e-2f32c4d90da3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostCurrent_019d7455-7306-7f25-b376-be4830eed7d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketableSecuritiesLineItems_019cd350-832c-70e7-b72f-7ec604e0ffd4" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostCurrent_019d7455-7306-7f25-b376-be4830eed7d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainBeforeTaxCurrent_019d7455-7306-7029-8445-38a933823407" xlink:href="hims-20260331.xsd#hims_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainBeforeTaxCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketableSecuritiesLineItems_019cd350-832c-70e7-b72f-7ec604e0ffd4" xlink:to="loc_hims_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainBeforeTaxCurrent_019d7455-7306-7029-8445-38a933823407" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedLossBeforeTaxCurrent_019d7455-7306-7fac-a8ee-ddd21a2eb06e" xlink:href="hims-20260331.xsd#hims_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedLossBeforeTaxCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketableSecuritiesLineItems_019cd350-832c-70e7-b72f-7ec604e0ffd4" xlink:to="loc_hims_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedLossBeforeTaxCurrent_019d7455-7306-7fac-a8ee-ddd21a2eb06e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_019d7455-7306-7f5a-a905-f6966da7f003" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketableSecuritiesLineItems_019cd350-832c-70e7-b72f-7ec604e0ffd4" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_019d7455-7306-7f5a-a905-f6966da7f003" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_019cd350-832c-716d-af48-84c3c3662d3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_019cd350-832c-7e29-b3c6-5605c180c1e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfHeldToMaturitySecuritiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_019cd350-832c-716d-af48-84c3c3662d3a" xlink:to="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_019cd350-832c-7e29-b3c6-5605c180c1e9" xlink:type="arc" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cd350-832c-734e-a3c7-1fa36fe4f546" 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_ScheduleOfHeldToMaturitySecuritiesTable_019cd350-832c-7e29-b3c6-5605c180c1e9" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cd350-832c-734e-a3c7-1fa36fe4f546" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cd350-832c-734e-a3c7-1fa36fe4f546_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cd350-832c-7f91-840a-d87f2a15b901" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_GovernmentAndGovernmentAgencyMember_019cd350-832c-7852-8603-bd866e3987fe" xlink:href="hims-20260331.xsd#hims_GovernmentAndGovernmentAgencyMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019cd350-832c-7a5e-a293-a19678d2b396" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryBillSecuritiesMember_019d7455-7306-7e95-9005-213ed795c9e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasuryBillSecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostNoncurrent_019d7456-c4f3-7d4c-8e2f-422f75f9328f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_019cd350-832c-716d-af48-84c3c3662d3a" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostNoncurrent_019d7456-c4f3-7d4c-8e2f-422f75f9328f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainBeforeTaxNoncurrent_019d7456-c4f3-7d94-8013-ab17e14fcde5" xlink:href="hims-20260331.xsd#hims_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainBeforeTaxNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_019cd350-832c-716d-af48-84c3c3662d3a" xlink:to="loc_hims_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainBeforeTaxNoncurrent_019d7456-c4f3-7d94-8013-ab17e14fcde5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedLossBeforeTaxNoncurrent_019d7456-c4f3-72c0-abdb-8c50e7f90372" xlink:href="hims-20260331.xsd#hims_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedLossBeforeTaxNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_019cd350-832c-716d-af48-84c3c3662d3a" xlink:to="loc_hims_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedLossBeforeTaxNoncurrent_019d7456-c4f3-72c0-abdb-8c50e7f90372" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent_019d7457-8075-747d-97f2-bbd6c379c9b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_019cd350-832c-716d-af48-84c3c3662d3a" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent_019d7457-8075-747d-97f2-bbd6c379c9b5" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/PropertyEquipmentandSoftwareNetDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#PropertyEquipmentandSoftwareNetDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/PropertyEquipmentandSoftwareNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019cd350-832c-7f89-8fe5-d9f07d5684b2" 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_019cd350-832c-7cf7-9578-3ed8a316fd69" 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_019cd350-832c-7f89-8fe5-d9f07d5684b2" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019cd350-832c-7cf7-9578-3ed8a316fd69" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019cd350-832c-72d2-bda7-28b5106638b9" 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_019cd350-832c-7cf7-9578-3ed8a316fd69" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019cd350-832c-72d2-bda7-28b5106638b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd350-832c-72d2-bda7-28b5106638b9_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_019cd350-832c-72d2-bda7-28b5106638b9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd350-832c-72d2-bda7-28b5106638b9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd350-832c-76c2-927e-6b441898182e" 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_019cd350-832c-72d2-bda7-28b5106638b9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd350-832c-76c2-927e-6b441898182e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_FacilityEquipmentAndOtherTangiblePropertyMember_019cd350-832c-755c-9fe3-55e36315ecc3" xlink:href="hims-20260331.xsd#hims_FacilityEquipmentAndOtherTangiblePropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd350-832c-76c2-927e-6b441898182e" xlink:to="loc_hims_FacilityEquipmentAndOtherTangiblePropertyMember_019cd350-832c-755c-9fe3-55e36315ecc3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_019cd350-832c-71da-b598-8dbc5cc9ab40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd350-832c-76c2-927e-6b441898182e" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_019cd350-832c-71da-b598-8dbc5cc9ab40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_019cd350-832c-7fb4-994a-624d9dc2006a" 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_019cd350-832c-76c2-927e-6b441898182e" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_019cd350-832c-7fb4-994a-624d9dc2006a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_AssetsNotPlacedInServiceMember_019cd350-832c-7a9e-8e03-40a42ece1a3c" xlink:href="hims-20260331.xsd#hims_AssetsNotPlacedInServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd350-832c-76c2-927e-6b441898182e" xlink:to="loc_hims_AssetsNotPlacedInServiceMember_019cd350-832c-7a9e-8e03-40a42ece1a3c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_PropertyEquipmentAndSoftwareGross_019cd350-832c-7be1-96a4-f6f583403e87" xlink:href="hims-20260331.xsd#hims_PropertyEquipmentAndSoftwareGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019cd350-832c-7f89-8fe5-d9f07d5684b2" xlink:to="loc_hims_PropertyEquipmentAndSoftwareGross_019cd350-832c-7be1-96a4-f6f583403e87" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_019cd350-832c-7142-b1fb-05c3103db75e" 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_019cd350-832c-7f89-8fe5-d9f07d5684b2" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_019cd350-832c-7142-b1fb-05c3103db75e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_PropertyEquipmentAndSoftwareNet_019cd350-832c-75c9-b6a6-c69406b98526" xlink:href="hims-20260331.xsd#hims_PropertyEquipmentAndSoftwareNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019cd350-832c-7f89-8fe5-d9f07d5684b2" xlink:to="loc_hims_PropertyEquipmentAndSoftwareNet_019cd350-832c-75c9-b6a6-c69406b98526" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/PropertyEquipmentandSoftwareNetAdditionalInformationDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#PropertyEquipmentandSoftwareNetAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/PropertyEquipmentandSoftwareNetAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019cd350-832c-7906-98bf-8494d1dfca8a" 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_019cd350-832c-769c-bb27-80a9d58bbee7" 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_019cd350-832c-7906-98bf-8494d1dfca8a" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019cd350-832c-769c-bb27-80a9d58bbee7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019cd350-832c-7098-97fe-f52725d638d8" 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_019cd350-832c-769c-bb27-80a9d58bbee7" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019cd350-832c-7098-97fe-f52725d638d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd350-832c-7098-97fe-f52725d638d8_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_019cd350-832c-7098-97fe-f52725d638d8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd350-832c-7098-97fe-f52725d638d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd350-832c-79fa-980e-aff7abfedead" 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_019cd350-832c-7098-97fe-f52725d638d8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd350-832c-79fa-980e-aff7abfedead" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_PropertyEquipmentAndSoftwareMember_019cd350-832c-77f6-8053-60450f44fc2d" xlink:href="hims-20260331.xsd#hims_PropertyEquipmentAndSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd350-832c-79fa-980e-aff7abfedead" xlink:to="loc_hims_PropertyEquipmentAndSoftwareMember_019cd350-832c-77f6-8053-60450f44fc2d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019cd350-832c-73d9-b1f1-ebee75d34ada" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019cd350-832c-7906-98bf-8494d1dfca8a" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019cd350-832c-73d9-b1f1-ebee75d34ada" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TangibleAssetImpairmentCharges_019d745f-7547-752f-90cc-acd2486a5701" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TangibleAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019cd350-832c-7906-98bf-8494d1dfca8a" xlink:to="loc_us-gaap_TangibleAssetImpairmentCharges_019d745f-7547-752f-90cc-acd2486a5701" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/GoodwillandIntangibleAssetsNetComponentsofIntangibleAssetsDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#GoodwillandIntangibleAssetsNetComponentsofIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/GoodwillandIntangibleAssetsNetComponentsofIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cd350-832c-7156-8157-665b74f76738" 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_019cd350-832c-75e3-b1e9-bf1d2ccebfae" 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_019cd350-832c-7156-8157-665b74f76738" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cd350-832c-75e3-b1e9-bf1d2ccebfae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cd350-832c-77ae-8487-5bbcc8ed05da" 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_019cd350-832c-75e3-b1e9-bf1d2ccebfae" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cd350-832c-77ae-8487-5bbcc8ed05da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cd350-832c-77ae-8487-5bbcc8ed05da_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_019cd350-832c-77ae-8487-5bbcc8ed05da" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cd350-832c-77ae-8487-5bbcc8ed05da_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cd350-832c-7501-9086-ab18499cd08e" 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_019cd350-832c-77ae-8487-5bbcc8ed05da" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cd350-832c-7501-9086-ab18499cd08e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_PlatformPartnershipsMember_019cd350-832c-7fc2-b8f7-62356209d5a9" xlink:href="hims-20260331.xsd#hims_PlatformPartnershipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cd350-832c-7501-9086-ab18499cd08e" xlink:to="loc_hims_PlatformPartnershipsMember_019cd350-832c-7fc2-b8f7-62356209d5a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DevelopedIntellectualPropertyMember_019dfed0-0907-712f-a085-4fa09ff7984a" xlink:href="hims-20260331.xsd#hims_DevelopedIntellectualPropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cd350-832c-7501-9086-ab18499cd08e" xlink:to="loc_hims_DevelopedIntellectualPropertyMember_019dfed0-0907-712f-a085-4fa09ff7984a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_019cd350-832c-720d-876b-665a896db424" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cd350-832c-7501-9086-ab18499cd08e" xlink:to="loc_us-gaap_TradeNamesMember_019cd350-832c-720d-876b-665a896db424" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_A503BLicenseMember_019cd350-832c-7a31-bc70-84a6a185f682" xlink:href="hims-20260331.xsd#hims_A503BLicenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cd350-832c-7501-9086-ab18499cd08e" xlink:to="loc_hims_A503BLicenseMember_019cd350-832c-7a31-bc70-84a6a185f682" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_019cd350-832c-7b55-a48e-f9b9cfb02574" 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_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cd350-832c-7501-9086-ab18499cd08e" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_019cd350-832c-7b55-a48e-f9b9cfb02574" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019cd350-832c-77a0-828c-a20ffd1788e6" 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_ScheduleOfFiniteLivedIntangibleAssetsTable_019cd350-832c-75e3-b1e9-bf1d2ccebfae" xlink:to="loc_srt_RangeAxis_019cd350-832c-77a0-828c-a20ffd1788e6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd350-832c-77a0-828c-a20ffd1788e6_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_019cd350-832c-77a0-828c-a20ffd1788e6" xlink:to="loc_srt_RangeMember_019cd350-832c-77a0-828c-a20ffd1788e6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd350-832c-7d0f-8dc1-717dd3bdc78e" 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_019cd350-832c-77a0-828c-a20ffd1788e6" xlink:to="loc_srt_RangeMember_019cd350-832c-7d0f-8dc1-717dd3bdc78e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_019cd350-832c-7018-9fb2-4e83fe9952fb" 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_019cd350-832c-7d0f-8dc1-717dd3bdc78e" xlink:to="loc_srt_WeightedAverageMember_019cd350-832c-7018-9fb2-4e83fe9952fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019cd350-832c-73f1-8c40-39eb2f8831a6" 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_019cd350-832c-7156-8157-665b74f76738" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019cd350-832c-73f1-8c40-39eb2f8831a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_FiniteLivedIntangibleAssetsAccumulatedAmortizationAndImpairment_019cd350-832c-7b45-9a2a-402cf42b7412" xlink:href="hims-20260331.xsd#hims_FiniteLivedIntangibleAssetsAccumulatedAmortizationAndImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cd350-832c-7156-8157-665b74f76738" xlink:to="loc_hims_FiniteLivedIntangibleAssetsAccumulatedAmortizationAndImpairment_019cd350-832c-7b45-9a2a-402cf42b7412" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019cd350-832c-773a-9e19-3a504fe74166" 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_019cd350-832c-7156-8157-665b74f76738" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019cd350-832c-773a-9e19-3a504fe74166" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_019cd350-832c-7e31-9533-b8c19a1aca0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cd350-832c-7156-8157-665b74f76738" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_019cd350-832c-7e31-9533-b8c19a1aca0d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/OperatingLeasesAdditionalDetailsDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#OperatingLeasesAdditionalDetailsDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/OperatingLeasesAdditionalDetailsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cd350-832d-7110-a85d-7313dcf4714a" 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_019cd350-832d-77e2-a38a-aa300c485a7c" 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_019cd350-832d-7110-a85d-7313dcf4714a" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_019cd350-832d-77e2-a38a-aa300c485a7c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019cd350-832d-78e4-aac5-b56bb0b7f0c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019cd350-832d-77e2-a38a-aa300c485a7c" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019cd350-832d-78e4-aac5-b56bb0b7f0c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019cd350-832d-78e4-aac5-b56bb0b7f0c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019cd350-832d-78e4-aac5-b56bb0b7f0c0" xlink:to="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019cd350-832d-78e4-aac5-b56bb0b7f0c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019cd350-832d-72bd-86c0-5a6e392a7d7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019cd350-832d-78e4-aac5-b56bb0b7f0c0" xlink:to="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019cd350-832d-72bd-86c0-5a6e392a7d7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLeaseNotYetCommencedMember_019cd350-832d-7a76-92a3-35e14d822783" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLeaseNotYetCommencedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019cd350-832d-72bd-86c0-5a6e392a7d7a" xlink:to="loc_us-gaap_OperatingLeaseLeaseNotYetCommencedMember_019cd350-832d-7a76-92a3-35e14d822783" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_AdditionalRightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_019dfed4-d59f-77a6-b5f0-d30c434224ee" xlink:href="hims-20260331.xsd#hims_AdditionalRightOfUseAssetObtainedInExchangeForOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cd350-832d-7110-a85d-7313dcf4714a" xlink:to="loc_hims_AdditionalRightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_019dfed4-d59f-77a6-b5f0-d30c434224ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_OperatingLeaseRightOfUseAssetAdjustment_019d77ce-19ad-7d9d-b1ab-4281dcb230b1" xlink:href="hims-20260331.xsd#hims_OperatingLeaseRightOfUseAssetAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cd350-832d-7110-a85d-7313dcf4714a" xlink:to="loc_hims_OperatingLeaseRightOfUseAssetAdjustment_019d77ce-19ad-7d9d-b1ab-4281dcb230b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_019cd350-832d-78fe-8215-bd36c30827ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cd350-832d-7110-a85d-7313dcf4714a" xlink:to="loc_us-gaap_OperatingLeaseCost_019cd350-832d-78fe-8215-bd36c30827ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_019cd350-832d-76ce-8baf-439210050a64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cd350-832d-7110-a85d-7313dcf4714a" xlink:to="loc_us-gaap_VariableLeaseCost_019cd350-832d-76ce-8baf-439210050a64" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasePayments_019cd350-832d-7aa6-ac9e-554e09c408e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeasePayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cd350-832d-7110-a85d-7313dcf4714a" xlink:to="loc_us-gaap_OperatingLeasePayments_019cd350-832d-7aa6-ac9e-554e09c408e3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_019cd350-832d-75d3-a71c-ef8baeaee320" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cd350-832d-7110-a85d-7313dcf4714a" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_019cd350-832d-75d3-a71c-ef8baeaee320" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_019cd350-832d-7272-9f87-193ff3dd6c2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cd350-832d-7110-a85d-7313dcf4714a" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_019cd350-832d-7272-9f87-193ff3dd6c2e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_019cd350-832d-76fb-9ee0-9065a7cad320" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cd350-832d-7110-a85d-7313dcf4714a" xlink:to="loc_us-gaap_OperatingLeaseLiability_019cd350-832d-76fb-9ee0-9065a7cad320" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount_019cd350-832d-7542-b7e2-dc2b6c7b2542" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cd350-832d-7110-a85d-7313dcf4714a" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount_019cd350-832d-7542-b7e2-dc2b6c7b2542" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/VariableInterestEntitiesDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#VariableInterestEntitiesDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/VariableInterestEntitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_019cd350-832d-7a66-967d-f4ad2f5cbb7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019cd350-832d-796d-b4dd-f0fcf191d4ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019cd350-832d-7a66-967d-f4ad2f5cbb7b" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019cd350-832d-796d-b4dd-f0fcf191d4ad" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019cd350-832d-7878-913a-12407b1ad78d" 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_ScheduleOfVariableInterestEntitiesTable_019cd350-832d-796d-b4dd-f0fcf191d4ad" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019cd350-832d-7878-913a-12407b1ad78d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019cd350-832d-7878-913a-12407b1ad78d_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_019cd350-832d-7878-913a-12407b1ad78d" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019cd350-832d-7878-913a-12407b1ad78d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019cd350-832d-716f-9b64-e061f25efe30" 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_019cd350-832d-7878-913a-12407b1ad78d" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019cd350-832d-716f-9b64-e061f25efe30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019cd350-832d-7305-a050-f731d7897078" 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_019cd350-832d-716f-9b64-e061f25efe30" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019cd350-832d-7305-a050-f731d7897078" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019cd350-832d-7279-b775-30d285222a1b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019cd350-832d-796d-b4dd-f0fcf191d4ad" xlink:to="loc_srt_ConsolidationItemsAxis_019cd350-832d-7279-b775-30d285222a1b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019cd350-832d-7279-b775-30d285222a1b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019cd350-832d-7279-b775-30d285222a1b" xlink:to="loc_srt_ConsolidationItemsDomain_019cd350-832d-7279-b775-30d285222a1b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019cd350-832d-7f3c-9dba-119cf74480a8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019cd350-832d-7279-b775-30d285222a1b" xlink:to="loc_srt_ConsolidationItemsDomain_019cd350-832d-7f3c-9dba-119cf74480a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationEliminationsMember_019cd350-832d-77f1-a4a2-c59e0b225e61" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationEliminationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019cd350-832d-7f3c-9dba-119cf74480a8" xlink:to="loc_srt_ConsolidationEliminationsMember_019cd350-832d-77f1-a4a2-c59e0b225e61" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_019cd350-832d-7d27-bef7-5cd74a70e9fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019cd350-832d-796d-b4dd-f0fcf191d4ad" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_019cd350-832d-7d27-bef7-5cd74a70e9fe" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019cd350-832d-7d27-bef7-5cd74a70e9fe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019cd350-832d-7d27-bef7-5cd74a70e9fe" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019cd350-832d-7d27-bef7-5cd74a70e9fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019cd350-832d-7fb4-9e57-8b12d36a58d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019cd350-832d-7d27-bef7-5cd74a70e9fe" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019cd350-832d-7fb4-9e57-8b12d36a58d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceAgreementsMember_019cd350-832d-77c0-9601-ab96ca6d15f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServiceAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019cd350-832d-7fb4-9e57-8b12d36a58d0" xlink:to="loc_us-gaap_ServiceAgreementsMember_019cd350-832d-77c0-9601-ab96ca6d15f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_019d77cf-ef64-789a-a9bb-881bcfbbb157" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019cd350-832d-7a66-967d-f4ad2f5cbb7b" xlink:to="loc_us-gaap_AssetsCurrent_019d77cf-ef64-789a-a9bb-881bcfbbb157" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019cd350-832d-7d0f-9a14-110795ea72fe" 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_VariableInterestEntityLineItems_019cd350-832d-7a66-967d-f4ad2f5cbb7b" xlink:to="loc_us-gaap_Assets_019cd350-832d-7d0f-9a14-110795ea72fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019cd350-832d-733e-b80e-218ca5711b04" 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_VariableInterestEntityLineItems_019cd350-832d-7a66-967d-f4ad2f5cbb7b" xlink:to="loc_us-gaap_Liabilities_019cd350-832d-733e-b80e-218ca5711b04" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_019cd350-832d-7f25-a124-a5bbc87da79f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAmountsOfTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019cd350-832d-7a66-967d-f4ad2f5cbb7b" xlink:to="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_019cd350-832d-7f25-a124-a5bbc87da79f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019cd350-832d-7897-aa68-952aabb91659" 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_VariableInterestEntityLineItems_019cd350-832d-7a66-967d-f4ad2f5cbb7b" xlink:to="loc_us-gaap_NetIncomeLoss_019cd350-832d-7897-aa68-952aabb91659" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/FairValueMeasurementsScheduleofAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#FairValueMeasurementsScheduleofAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/FairValueMeasurementsScheduleofAssetsandLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cd350-832d-7e9e-8d4a-fd5542482ee0" 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_019cd350-832d-7863-8134-a9c24ca7c4b4" 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_019cd350-832d-7e9e-8d4a-fd5542482ee0" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cd350-832d-7863-8134-a9c24ca7c4b4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cd350-832d-7574-832d-f615f90e83ad" 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_019cd350-832d-7863-8134-a9c24ca7c4b4" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cd350-832d-7574-832d-f615f90e83ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd350-832d-7574-832d-f615f90e83ad_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_019cd350-832d-7574-832d-f615f90e83ad" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd350-832d-7574-832d-f615f90e83ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd350-832d-7d7b-8488-22ce623b8233" 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_019cd350-832d-7574-832d-f615f90e83ad" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd350-832d-7d7b-8488-22ce623b8233" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019cd350-832d-7410-9484-b5d8f191650f" 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_019cd350-832d-7d7b-8488-22ce623b8233" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019cd350-832d-7410-9484-b5d8f191650f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019cd350-832d-71bd-994a-75ecd117fcbc" 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_019cd350-832d-7d7b-8488-22ce623b8233" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019cd350-832d-71bd-994a-75ecd117fcbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019cd350-832d-73a0-bb67-2e510c3cbb95" 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_019cd350-832d-7d7b-8488-22ce623b8233" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019cd350-832d-73a0-bb67-2e510c3cbb95" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_019cd350-832d-7ea9-836d-9d73694c2b61" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cd350-832d-7863-8134-a9c24ca7c4b4" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_019cd350-832d-7ea9-836d-9d73694c2b61" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019cd350-832d-7ea9-836d-9d73694c2b61_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_019cd350-832d-7ea9-836d-9d73694c2b61" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019cd350-832d-7ea9-836d-9d73694c2b61_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019cd350-832d-75ad-b92c-1a4d9ac0c6e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_019cd350-832d-7ea9-836d-9d73694c2b61" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019cd350-832d-75ad-b92c-1a4d9ac0c6e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_019cd350-832d-7539-a2b9-a295c3e2e33a" 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_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019cd350-832d-75ad-b92c-1a4d9ac0c6e5" xlink:to="loc_us-gaap_MoneyMarketFundsMember_019cd350-832d-7539-a2b9-a295c3e2e33a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cd350-832d-7d8a-8a42-37d0cf373897" 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_019cd350-832d-7863-8134-a9c24ca7c4b4" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cd350-832d-7d8a-8a42-37d0cf373897" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cd350-832d-7d8a-8a42-37d0cf373897_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_019cd350-832d-7d8a-8a42-37d0cf373897" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cd350-832d-7d8a-8a42-37d0cf373897_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cd350-832d-7c3a-8450-5c6eba9aad57" 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_019cd350-832d-7d8a-8a42-37d0cf373897" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cd350-832d-7c3a-8450-5c6eba9aad57" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_GovernmentAndGovernmentAgencyMember_019cd350-832d-7d69-9b79-2b944a79d83c" xlink:href="hims-20260331.xsd#hims_GovernmentAndGovernmentAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cd350-832d-7c3a-8450-5c6eba9aad57" xlink:to="loc_hims_GovernmentAndGovernmentAgencyMember_019cd350-832d-7d69-9b79-2b944a79d83c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateBondSecuritiesMember_019cd350-832d-7898-9859-99366acfffae" 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_019cd350-832d-7c3a-8450-5c6eba9aad57" xlink:to="loc_us-gaap_CorporateBondSecuritiesMember_019cd350-832d-7898-9859-99366acfffae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryBillSecuritiesMember_019cd350-832d-79f0-add8-f2677a33dddb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasuryBillSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cd350-832d-7c3a-8450-5c6eba9aad57" xlink:to="loc_us-gaap_USTreasuryBillSecuritiesMember_019cd350-832d-79f0-add8-f2677a33dddb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndemnificationGuaranteeMember_019d1c53-a155-785c-addf-ca324f4f0ddf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndemnificationGuaranteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cd350-832d-7c3a-8450-5c6eba9aad57" xlink:to="loc_us-gaap_IndemnificationGuaranteeMember_019d1c53-a155-785c-addf-ca324f4f0ddf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019d1c54-0f90-7227-80c3-302734211c6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cd350-832d-7c3a-8450-5c6eba9aad57" xlink:to="loc_us-gaap_EquitySecuritiesMember_019d1c54-0f90-7227-80c3-302734211c6a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cd350-832d-78a3-83e2-e8008dbf37c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cd350-832d-7e9e-8d4a-fd5542482ee0" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cd350-832d-78a3-83e2-e8008dbf37c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019cd350-832d-7f03-9ae3-7c9377342a8c" 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_AssetsFairValueDisclosureAbstract_019cd350-832d-78a3-83e2-e8008dbf37c8" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019cd350-832d-7f03-9ae3-7c9377342a8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_019cd350-832d-7969-9c0c-d0c704a4e6dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cd350-832d-78a3-83e2-e8008dbf37c8" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_019cd350-832d-7969-9c0c-d0c704a4e6dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019d1c53-a155-7c5d-ba24-3089ba19552a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cd350-832d-78a3-83e2-e8008dbf37c8" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019d1c53-a155-7c5d-ba24-3089ba19552a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent_019d1c55-1280-7a46-a304-8056446466b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cd350-832d-78a3-83e2-e8008dbf37c8" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent_019d1c55-1280-7a46-a304-8056446466b9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent_019d1c54-0f90-7dbd-ac06-c41c7fd907b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cd350-832d-78a3-83e2-e8008dbf37c8" xlink:to="loc_us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent_019d1c54-0f90-7dbd-ac06-c41c7fd907b4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_IndemnificationAssetsNonCurrent_019d1c54-0f90-772d-9668-42a756ad04d4" xlink:href="hims-20260331.xsd#hims_IndemnificationAssetsNonCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019cd350-832d-78a3-83e2-e8008dbf37c8" xlink:to="loc_hims_IndemnificationAssetsNonCurrent_019d1c54-0f90-772d-9668-42a756ad04d4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019cd350-832d-7de4-80b9-42374cc5805d" 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_AssetsFairValueDisclosureAbstract_019cd350-832d-78a3-83e2-e8008dbf37c8" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019cd350-832d-7de4-80b9-42374cc5805d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019cd350-832d-772d-8711-cb876b5120b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cd350-832d-7e9e-8d4a-fd5542482ee0" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019cd350-832d-772d-8711-cb876b5120b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_EarnOutLiabilitiesFairValueDisclosureNoncurrent_019cd350-832d-7290-b210-10c25d0b8846" xlink:href="hims-20260331.xsd#hims_EarnOutLiabilitiesFairValueDisclosureNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019cd350-832d-772d-8711-cb876b5120b8" xlink:to="loc_hims_EarnOutLiabilitiesFairValueDisclosureNoncurrent_019cd350-832d-7290-b210-10c25d0b8846" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_IndemnificationLiabilitiesNoncurrent_019d1c54-97bb-7248-8101-4488e11674f6" xlink:href="hims-20260331.xsd#hims_IndemnificationLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019cd350-832d-772d-8711-cb876b5120b8" xlink:to="loc_hims_IndemnificationLiabilitiesNoncurrent_019d1c54-97bb-7248-8101-4488e11674f6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ContingentConsiderationClassifiedAsOtherFairValueDisclosure_019cd350-832d-799f-83d5-f303e73ee739" xlink:href="hims-20260331.xsd#hims_ContingentConsiderationClassifiedAsOtherFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019cd350-832d-772d-8711-cb876b5120b8" xlink:to="loc_hims_ContingentConsiderationClassifiedAsOtherFairValueDisclosure_019cd350-832d-799f-83d5-f303e73ee739" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019cd350-832d-7608-ae22-27fb539fa928" 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_LiabilitiesFairValueDisclosureAbstract_019cd350-832d-772d-8711-cb876b5120b8" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019cd350-832d-7608-ae22-27fb539fa928" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/FairValueMeasurementsFairValueAssumptionsDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#FairValueMeasurementsFairValueAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/FairValueMeasurementsFairValueAssumptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019cd350-832d-7c67-9c2c-37581d62b49b" 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_019cd350-832d-7c5e-9c6e-e4771bb26c92" 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_019cd350-832d-7c67-9c2c-37581d62b49b" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019cd350-832d-7c5e-9c6e-e4771bb26c92" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cd350-832d-7dee-bad1-b477631598db" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019cd350-832d-7c5e-9c6e-e4771bb26c92" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cd350-832d-7dee-bad1-b477631598db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd350-832d-7dee-bad1-b477631598db_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_019cd350-832d-7dee-bad1-b477631598db" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd350-832d-7dee-bad1-b477631598db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd350-832d-76c6-bf72-3e9569056050" 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_019cd350-832d-7dee-bad1-b477631598db" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd350-832d-76c6-bf72-3e9569056050" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019cd350-832d-78fe-af51-e67aade3fc2b" 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_019cd350-832d-76c6-bf72-3e9569056050" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019cd350-832d-78fe-af51-e67aade3fc2b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_019cd350-832d-72f2-9909-9779e3a6a521" 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_019cd350-832d-7c5e-9c6e-e4771bb26c92" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_019cd350-832d-72f2-9909-9779e3a6a521" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019cd350-832d-72f2-9909-9779e3a6a521_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_019cd350-832d-72f2-9909-9779e3a6a521" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019cd350-832d-72f2-9909-9779e3a6a521_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019cd350-832d-7dba-99d7-32ad8215a08f" 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_019cd350-832d-72f2-9909-9779e3a6a521" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019cd350-832d-7dba-99d7-32ad8215a08f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_019cd350-832d-713e-8bee-c7faa8e0b472" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputRiskFreeInterestRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cd350-832d-7dba-99d7-32ad8215a08f" xlink:to="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_019cd350-832d-713e-8bee-c7faa8e0b472" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputPriceVolatilityMember_019cd350-832d-7b24-bbb8-b125b8f54192" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputPriceVolatilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cd350-832d-7dba-99d7-32ad8215a08f" xlink:to="loc_us-gaap_MeasurementInputPriceVolatilityMember_019cd350-832d-7b24-bbb8-b125b8f54192" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_MeasurementInputRevenueRiskAdjustedDiscountRateMember_019cd350-832d-72cf-88e0-3c15653c7658" xlink:href="hims-20260331.xsd#hims_MeasurementInputRevenueRiskAdjustedDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cd350-832d-7dba-99d7-32ad8215a08f" xlink:to="loc_hims_MeasurementInputRevenueRiskAdjustedDiscountRateMember_019cd350-832d-72cf-88e0-3c15653c7658" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_MeasurementInputCounterpartyDiscountRateMember_019cd350-832d-7310-ac89-1cb274c40c35" xlink:href="hims-20260331.xsd#hims_MeasurementInputCounterpartyDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cd350-832d-7dba-99d7-32ad8215a08f" xlink:to="loc_hims_MeasurementInputCounterpartyDiscountRateMember_019cd350-832d-7310-ac89-1cb274c40c35" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_019cd350-832d-7626-beca-5147ac5ab961" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019cd350-832d-7c5e-9c6e-e4771bb26c92" xlink:to="loc_us-gaap_ValuationTechniqueAxis_019cd350-832d-7626-beca-5147ac5ab961" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019cd350-832d-7626-beca-5147ac5ab961_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019cd350-832d-7626-beca-5147ac5ab961" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019cd350-832d-7626-beca-5147ac5ab961_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019cd350-832d-7777-9189-493d0a52ea09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019cd350-832d-7626-beca-5147ac5ab961" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019cd350-832d-7777-9189-493d0a52ea09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MonteCarloModelMember_019cd350-832d-7241-a1ab-f4aeb9c196af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MonteCarloModelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019cd350-832d-7777-9189-493d0a52ea09" xlink:to="loc_us-gaap_MonteCarloModelMember_019cd350-832d-7241-a1ab-f4aeb9c196af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019cd350-832d-7b21-8520-83ab7a1af6ce" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019cd350-832d-7c5e-9c6e-e4771bb26c92" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019cd350-832d-7b21-8520-83ab7a1af6ce" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832d-7b21-8520-83ab7a1af6ce_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_019cd350-832d-7b21-8520-83ab7a1af6ce" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832d-7b21-8520-83ab7a1af6ce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832d-70e2-9a58-50cedbc49f33" 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_019cd350-832d-7b21-8520-83ab7a1af6ce" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832d-70e2-9a58-50cedbc49f33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ZavaGlobalGmbHMember_019cd350-832d-75a4-a4e7-54bb1b43925f" xlink:href="hims-20260331.xsd#hims_ZavaGlobalGmbHMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832d-70e2-9a58-50cedbc49f33" xlink:to="loc_hims_ZavaGlobalGmbHMember_019cd350-832d-75a4-a4e7-54bb1b43925f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityMeasurementInput_019cd350-832d-7580-a01b-c3215e6d28c9" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019cd350-832d-7c67-9c2c-37581d62b49b" xlink:to="loc_us-gaap_DerivativeLiabilityMeasurementInput_019cd350-832d-7580-a01b-c3215e6d28c9" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/FairValueMeasurementsChangeintheFairValueofEarnoutLiabilitiesDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#FairValueMeasurementsChangeintheFairValueofEarnoutLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/FairValueMeasurementsChangeintheFairValueofEarnoutLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cd350-832d-7068-9624-c18215415a2a" 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_019cd350-832d-7c3e-91e4-5c026db1e527" 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_019cd350-832d-7068-9624-c18215415a2a" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cd350-832d-7c3e-91e4-5c026db1e527" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_019cd350-832d-75ad-833a-e5ad1a8e6a31" 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_019cd350-832d-7c3e-91e4-5c026db1e527" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_019cd350-832d-75ad-833a-e5ad1a8e6a31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019cd350-832d-75ad-833a-e5ad1a8e6a31_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_019cd350-832d-75ad-833a-e5ad1a8e6a31" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019cd350-832d-75ad-833a-e5ad1a8e6a31_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019cd350-832d-739a-b8f2-1056d97992e7" 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_019cd350-832d-75ad-833a-e5ad1a8e6a31" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019cd350-832d-739a-b8f2-1056d97992e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_EarnOutLiabilityMember_019cd350-832d-7d09-9888-1b910edffff0" xlink:href="hims-20260331.xsd#hims_EarnOutLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019cd350-832d-739a-b8f2-1056d97992e7" xlink:to="loc_hims_EarnOutLiabilityMember_019cd350-832d-7d09-9888-1b910edffff0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019cd350-832d-7ad5-8231-ac6785287bbf" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cd350-832d-7c3e-91e4-5c026db1e527" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019cd350-832d-7ad5-8231-ac6785287bbf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832d-7ad5-8231-ac6785287bbf_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_019cd350-832d-7ad5-8231-ac6785287bbf" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832d-7ad5-8231-ac6785287bbf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832d-73a3-a92b-22d91f3fa2c8" 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_019cd350-832d-7ad5-8231-ac6785287bbf" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832d-73a3-a92b-22d91f3fa2c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ZavaGlobalGmbHMember_019cd350-832d-724a-8e73-fcddbea29215" xlink:href="hims-20260331.xsd#hims_ZavaGlobalGmbHMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cd350-832d-73a3-a92b-22d91f3fa2c8" xlink:to="loc_hims_ZavaGlobalGmbHMember_019cd350-832d-724a-8e73-fcddbea29215" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019cd350-832d-74f8-929c-f6c8356c7a95" 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_019cd350-832d-7068-9624-c18215415a2a" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019cd350-832d-74f8-929c-f6c8356c7a95" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019cd350-832d-7cc3-ba5c-98584462d54e" 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_019cd350-832d-74f8-929c-f6c8356c7a95" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019cd350-832d-7cc3-ba5c-98584462d54e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_019cd350-832d-7e73-9e47-b2b3a448b7c3" 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_019cd350-832d-74f8-929c-f6c8356c7a95" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_019cd350-832d-7e73-9e47-b2b3a448b7c3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_019cd350-832d-7cd9-a1ff-634d4e799b0f" 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_019cd350-832d-74f8-929c-f6c8356c7a95" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_019cd350-832d-7cd9-a1ff-634d4e799b0f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityReclassificationsToShortTermEarnOutPayable_019dd1a0-6440-7fc0-842c-869046e2a5ea" xlink:href="hims-20260331.xsd#hims_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityReclassificationsToShortTermEarnOutPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019cd350-832d-74f8-929c-f6c8356c7a95" xlink:to="loc_hims_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityReclassificationsToShortTermEarnOutPayable_019dd1a0-6440-7fc0-842c-869046e2a5ea" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityReclassificationsToLongTermEarnOutPayable_019d77d3-b6fd-7908-a640-45bc7a586cb4" xlink:href="hims-20260331.xsd#hims_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityReclassificationsToLongTermEarnOutPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019cd350-832d-74f8-929c-f6c8356c7a95" xlink:to="loc_hims_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityReclassificationsToLongTermEarnOutPayable_019d77d3-b6fd-7908-a640-45bc7a586cb4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease_019cd350-832d-77ca-b7d0-6e55c6cb53ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019cd350-832d-74f8-929c-f6c8356c7a95" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease_019cd350-832d-77ca-b7d0-6e55c6cb53ec" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019cd350-832d-734d-ad3f-38ed39acba9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/DebtDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#DebtDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/DebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" 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_019cd350-832d-7340-b3b1-cc53880eb1bb" 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_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_019cd350-832d-7340-b3b1-cc53880eb1bb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019cd350-832d-7c7f-ae2a-735e75d2ef3b" 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_019cd350-832d-7340-b3b1-cc53880eb1bb" xlink:to="loc_us-gaap_CreditFacilityAxis_019cd350-832d-7c7f-ae2a-735e75d2ef3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019cd350-832d-7c7f-ae2a-735e75d2ef3b_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_019cd350-832d-7c7f-ae2a-735e75d2ef3b" xlink:to="loc_us-gaap_CreditFacilityDomain_019cd350-832d-7c7f-ae2a-735e75d2ef3b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019cd350-832d-741e-8d25-564a78df2d6f" 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_019cd350-832d-7c7f-ae2a-735e75d2ef3b" xlink:to="loc_us-gaap_CreditFacilityDomain_019cd350-832d-741e-8d25-564a78df2d6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019cd350-832d-7712-be84-075d345e5146" 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_019cd350-832d-741e-8d25-564a78df2d6f" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019cd350-832d-7712-be84-075d345e5146" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019cd350-832d-782e-906f-412b25ad4640" 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_019cd350-832d-7340-b3b1-cc53880eb1bb" xlink:to="loc_us-gaap_DebtInstrumentAxis_019cd350-832d-782e-906f-412b25ad4640" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019cd350-832d-782e-906f-412b25ad4640_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_019cd350-832d-782e-906f-412b25ad4640" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019cd350-832d-782e-906f-412b25ad4640_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019cd350-832d-7c02-9bf5-18c1e73faef1" 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_019cd350-832d-782e-906f-412b25ad4640" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019cd350-832d-7c02-9bf5-18c1e73faef1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ConvertibleSeniorNotesDue2030Member_019cd350-832d-7c78-a6c7-8017e27ee157" xlink:href="hims-20260331.xsd#hims_ConvertibleSeniorNotesDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cd350-832d-7c02-9bf5-18c1e73faef1" xlink:to="loc_hims_ConvertibleSeniorNotesDue2030Member_019cd350-832d-7c78-a6c7-8017e27ee157" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_TheCreditFacilityMember_019cd350-832d-7b32-9274-87476c5dc0e5" xlink:href="hims-20260331.xsd#hims_TheCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cd350-832d-7c02-9bf5-18c1e73faef1" xlink:to="loc_hims_TheCreditFacilityMember_019cd350-832d-7b32-9274-87476c5dc0e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019cd350-832d-7262-8dd7-76299b953b53" 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_019cd350-832d-7340-b3b1-cc53880eb1bb" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019cd350-832d-7262-8dd7-76299b953b53" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019cd350-832d-7262-8dd7-76299b953b53_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_019cd350-832d-7262-8dd7-76299b953b53" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019cd350-832d-7262-8dd7-76299b953b53_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019cd350-832d-711a-8678-a8683e419151" 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_019cd350-832d-7262-8dd7-76299b953b53" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019cd350-832d-711a-8678-a8683e419151" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_019cd350-832d-7d45-a364-965a5f143778" 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_019cd350-832d-711a-8678-a8683e419151" xlink:to="loc_us-gaap_ConvertibleDebtMember_019cd350-832d-7d45-a364-965a5f143778" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019cd350-832d-716e-ac7d-a4d19298b6bd" 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_019cd350-832d-711a-8678-a8683e419151" xlink:to="loc_us-gaap_LineOfCreditMember_019cd350-832d-716e-ac7d-a4d19298b6bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableMember_019cd350-832d-7480-a3e7-24d649d1ef83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019cd350-832d-711a-8678-a8683e419151" xlink:to="loc_us-gaap_LoansPayableMember_019cd350-832d-7480-a3e7-24d649d1ef83" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_019cd350-832d-778d-bc42-1ebafaffc5dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019cd350-832d-711a-8678-a8683e419151" xlink:to="loc_us-gaap_LetterOfCreditMember_019cd350-832d-778d-bc42-1ebafaffc5dd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_019cd350-832d-7691-916d-c75ba52b1dfd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019cd350-832d-7340-b3b1-cc53880eb1bb" xlink:to="loc_us-gaap_VariableRateAxis_019cd350-832d-7691-916d-c75ba52b1dfd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019cd350-832d-7691-916d-c75ba52b1dfd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_019cd350-832d-7691-916d-c75ba52b1dfd" xlink:to="loc_us-gaap_VariableRateDomain_019cd350-832d-7691-916d-c75ba52b1dfd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019cd350-832d-7665-bfda-e4656a064330" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_019cd350-832d-7691-916d-c75ba52b1dfd" xlink:to="loc_us-gaap_VariableRateDomain_019cd350-832d-7665-bfda-e4656a064330" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_019cd350-832d-787f-b426-69a2ed631a38" 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_us-gaap_VariableRateDomain_019cd350-832d-7665-bfda-e4656a064330" xlink:to="loc_us-gaap_BaseRateMember_019cd350-832d-787f-b426-69a2ed631a38" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019cd350-832d-74c9-9b0c-a12fca51fb61" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019cd350-832d-7665-bfda-e4656a064330" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019cd350-832d-74c9-9b0c-a12fca51fb61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_VariableRateComponentAxis_019cd350-832d-7497-a27b-2c7daa0db122" xlink:href="hims-20260331.xsd#hims_VariableRateComponentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019cd350-832d-7340-b3b1-cc53880eb1bb" xlink:to="loc_hims_VariableRateComponentAxis_019cd350-832d-7497-a27b-2c7daa0db122" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_VariableRateComponentDomain_019cd350-832d-7497-a27b-2c7daa0db122_default" xlink:href="hims-20260331.xsd#hims_VariableRateComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hims_VariableRateComponentAxis_019cd350-832d-7497-a27b-2c7daa0db122" xlink:to="loc_hims_VariableRateComponentDomain_019cd350-832d-7497-a27b-2c7daa0db122_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_VariableRateComponentDomain_019cd350-832d-7d79-9ca6-423ca04894d9" xlink:href="hims-20260331.xsd#hims_VariableRateComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hims_VariableRateComponentAxis_019cd350-832d-7497-a27b-2c7daa0db122" xlink:to="loc_hims_VariableRateComponentDomain_019cd350-832d-7d79-9ca6-423ca04894d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_VariableRateComponentOneMember_019cd350-832d-7023-8f59-1a6a7dd4bb9e" xlink:href="hims-20260331.xsd#hims_VariableRateComponentOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hims_VariableRateComponentDomain_019cd350-832d-7d79-9ca6-423ca04894d9" xlink:to="loc_hims_VariableRateComponentOneMember_019cd350-832d-7023-8f59-1a6a7dd4bb9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_VariableRateComponentTwoMember_019cd350-832d-7508-9faf-587201a4a74a" xlink:href="hims-20260331.xsd#hims_VariableRateComponentTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hims_VariableRateComponentDomain_019cd350-832d-7d79-9ca6-423ca04894d9" xlink:to="loc_hims_VariableRateComponentTwoMember_019cd350-832d-7508-9faf-587201a4a74a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019cd350-832d-7529-99d3-3732e2e9c142" 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_LineOfCreditFacilityTable_019cd350-832d-7340-b3b1-cc53880eb1bb" xlink:to="loc_srt_RangeAxis_019cd350-832d-7529-99d3-3732e2e9c142" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd350-832d-7529-99d3-3732e2e9c142_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_019cd350-832d-7529-99d3-3732e2e9c142" xlink:to="loc_srt_RangeMember_019cd350-832d-7529-99d3-3732e2e9c142_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd350-832d-7423-b00a-25e035838dee" 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_019cd350-832d-7529-99d3-3732e2e9c142" xlink:to="loc_srt_RangeMember_019cd350-832d-7423-b00a-25e035838dee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019cd350-832d-70cf-b192-0480fa709737" 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_019cd350-832d-7423-b00a-25e035838dee" xlink:to="loc_srt_MinimumMember_019cd350-832d-70cf-b192-0480fa709737" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019cd350-832d-79e0-b754-5241eb426a43" 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_019cd350-832d-7423-b00a-25e035838dee" xlink:to="loc_srt_MaximumMember_019cd350-832d-79e0-b754-5241eb426a43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtInstrumentConvertibleTermsOfConversionAxis_019cd350-832d-7ad7-9735-51d013baafcf" xlink:href="hims-20260331.xsd#hims_DebtInstrumentConvertibleTermsOfConversionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019cd350-832d-7340-b3b1-cc53880eb1bb" xlink:to="loc_hims_DebtInstrumentConvertibleTermsOfConversionAxis_019cd350-832d-7ad7-9735-51d013baafcf" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtInstrumentConvertibleTermsOfConversionDomain_019cd350-832d-7ad7-9735-51d013baafcf_default" xlink:href="hims-20260331.xsd#hims_DebtInstrumentConvertibleTermsOfConversionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hims_DebtInstrumentConvertibleTermsOfConversionAxis_019cd350-832d-7ad7-9735-51d013baafcf" xlink:to="loc_hims_DebtInstrumentConvertibleTermsOfConversionDomain_019cd350-832d-7ad7-9735-51d013baafcf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtInstrumentConvertibleTermsOfConversionDomain_019cd350-832d-716a-985b-7031296ce9c3" xlink:href="hims-20260331.xsd#hims_DebtInstrumentConvertibleTermsOfConversionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hims_DebtInstrumentConvertibleTermsOfConversionAxis_019cd350-832d-7ad7-9735-51d013baafcf" xlink:to="loc_hims_DebtInstrumentConvertibleTermsOfConversionDomain_019cd350-832d-716a-985b-7031296ce9c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtConversionTermsOneMember_019cd350-832d-76d2-bd17-0ae0f2c7df03" xlink:href="hims-20260331.xsd#hims_DebtConversionTermsOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hims_DebtInstrumentConvertibleTermsOfConversionDomain_019cd350-832d-716a-985b-7031296ce9c3" xlink:to="loc_hims_DebtConversionTermsOneMember_019cd350-832d-76d2-bd17-0ae0f2c7df03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtConversionTermsTwoMember_019cd350-832d-7f02-a202-03723ece5a8c" xlink:href="hims-20260331.xsd#hims_DebtConversionTermsTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hims_DebtInstrumentConvertibleTermsOfConversionDomain_019cd350-832d-716a-985b-7031296ce9c3" xlink:to="loc_hims_DebtConversionTermsTwoMember_019cd350-832d-7f02-a202-03723ece5a8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtInstrumentSpecialInterestPeriodOfAccrualAxis_019cd350-832d-7ab5-aa30-72a3c7b157bf" xlink:href="hims-20260331.xsd#hims_DebtInstrumentSpecialInterestPeriodOfAccrualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019cd350-832d-7340-b3b1-cc53880eb1bb" xlink:to="loc_hims_DebtInstrumentSpecialInterestPeriodOfAccrualAxis_019cd350-832d-7ab5-aa30-72a3c7b157bf" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtInstrumentSpecialInterestPeriodOfAccrualDomain_019cd350-832d-7ab5-aa30-72a3c7b157bf_default" xlink:href="hims-20260331.xsd#hims_DebtInstrumentSpecialInterestPeriodOfAccrualDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hims_DebtInstrumentSpecialInterestPeriodOfAccrualAxis_019cd350-832d-7ab5-aa30-72a3c7b157bf" xlink:to="loc_hims_DebtInstrumentSpecialInterestPeriodOfAccrualDomain_019cd350-832d-7ab5-aa30-72a3c7b157bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtInstrumentSpecialInterestPeriodOfAccrualDomain_019cd350-832d-73ef-9b50-0c41cf310fcf" xlink:href="hims-20260331.xsd#hims_DebtInstrumentSpecialInterestPeriodOfAccrualDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hims_DebtInstrumentSpecialInterestPeriodOfAccrualAxis_019cd350-832d-7ab5-aa30-72a3c7b157bf" xlink:to="loc_hims_DebtInstrumentSpecialInterestPeriodOfAccrualDomain_019cd350-832d-73ef-9b50-0c41cf310fcf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_A0180DaysMember_019cd350-832d-7d25-83c6-6182148fe881" xlink:href="hims-20260331.xsd#hims_A0180DaysMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hims_DebtInstrumentSpecialInterestPeriodOfAccrualDomain_019cd350-832d-73ef-9b50-0c41cf310fcf" xlink:to="loc_hims_A0180DaysMember_019cd350-832d-7d25-83c6-6182148fe881" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_A180365DaysMember_019cd350-832d-7ddd-a37b-d78f1798e91f" xlink:href="hims-20260331.xsd#hims_A180365DaysMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hims_DebtInstrumentSpecialInterestPeriodOfAccrualDomain_019cd350-832d-73ef-9b50-0c41cf310fcf" xlink:to="loc_hims_A180365DaysMember_019cd350-832d-7ddd-a37b-d78f1798e91f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019cd350-832d-7a81-9c6a-3c9dbfd460d2" 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_LineOfCreditFacilityTable_019cd350-832d-7340-b3b1-cc53880eb1bb" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019cd350-832d-7a81-9c6a-3c9dbfd460d2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cd350-832d-7a81-9c6a-3c9dbfd460d2_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_019cd350-832d-7a81-9c6a-3c9dbfd460d2" xlink:to="loc_us-gaap_EquityComponentDomain_019cd350-832d-7a81-9c6a-3c9dbfd460d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cd350-832d-70d4-97c8-87e28b3c6013" 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_019cd350-832d-7a81-9c6a-3c9dbfd460d2" xlink:to="loc_us-gaap_EquityComponentDomain_019cd350-832d-70d4-97c8-87e28b3c6013" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019cd350-832d-7538-9232-6ae369554256" 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_019cd350-832d-70d4-97c8-87e28b3c6013" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019cd350-832d-7538-9232-6ae369554256" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_019d1c60-aadd-7342-a699-0b38e6cd29f3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019cd350-832d-7340-b3b1-cc53880eb1bb" xlink:to="loc_srt_ShareRepurchaseProgramAxis_019d1c60-aadd-7342-a699-0b38e6cd29f3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019d1c60-aadd-7342-a699-0b38e6cd29f3_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019d1c60-aadd-7342-a699-0b38e6cd29f3" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019d1c60-aadd-7342-a699-0b38e6cd29f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019d1c60-aadd-7dae-8ccd-c6fb1d508764" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019d1c60-aadd-7342-a699-0b38e6cd29f3" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019d1c60-aadd-7dae-8ccd-c6fb1d508764" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_A2025ShareRepurchaseProgramMember_019d1c60-aadd-7cb7-9a41-63888efc1f93" xlink:href="hims-20260331.xsd#hims_A2025ShareRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019d1c60-aadd-7dae-8ccd-c6fb1d508764" xlink:to="loc_hims_A2025ShareRepurchaseProgramMember_019d1c60-aadd-7cb7-9a41-63888efc1f93" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019d1c60-aadd-75ad-adce-c6d454bb5009" 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_LineOfCreditFacilityTable_019cd350-832d-7340-b3b1-cc53880eb1bb" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019d1c60-aadd-75ad-adce-c6d454bb5009" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019d1c60-aadd-75ad-adce-c6d454bb5009_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_019d1c60-aadd-75ad-adce-c6d454bb5009" xlink:to="loc_us-gaap_ClassOfStockDomain_019d1c60-aadd-75ad-adce-c6d454bb5009_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019d1c60-aadd-74a3-8d3f-2ec28247da75" 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_019d1c60-aadd-75ad-adce-c6d454bb5009" xlink:to="loc_us-gaap_ClassOfStockDomain_019d1c60-aadd-74a3-8d3f-2ec28247da75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019d1c60-aadd-784f-9f29-1cb6e911a425" 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_019d1c60-aadd-74a3-8d3f-2ec28247da75" xlink:to="loc_us-gaap_CommonClassAMember_019d1c60-aadd-784f-9f29-1cb6e911a425" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019cd350-832d-7738-bbb5-994255ee7e0a" 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_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019cd350-832d-7738-bbb5-994255ee7e0a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019cd350-832d-7103-9017-f404e5b8115e" 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_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019cd350-832d-7103-9017-f404e5b8115e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromConvertibleDebt_019cd350-832d-7d38-b4b1-40ef4b3011a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_ProceedsFromConvertibleDebt_019cd350-832d-7d38-b4b1-40ef4b3011a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_019cd350-832d-7e60-ab68-c7c7f5b91479" 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_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_019cd350-832d-7e60-ab68-c7c7f5b91479" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_019cd350-832d-7c2c-8c7e-0f06dd28a390" 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_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_019cd350-832d-7c2c-8c7e-0f06dd28a390" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtInstrumentRedemptionOptionThresholdPeriodPriorToMaturityDateNumberOfTradingDays_019d1c95-904c-7a05-ad5d-36ea71a21c30" xlink:href="hims-20260331.xsd#hims_DebtInstrumentRedemptionOptionThresholdPeriodPriorToMaturityDateNumberOfTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_hims_DebtInstrumentRedemptionOptionThresholdPeriodPriorToMaturityDateNumberOfTradingDays_019d1c95-904c-7a05-ad5d-36ea71a21c30" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_019cd350-832d-7e32-884e-610d53baaab4" 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_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_019cd350-832d-7e32-884e-610d53baaab4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_019cd350-832d-71e5-aa99-53d059240158" 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_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_019cd350-832d-71e5-aa99-53d059240158" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_019cd350-832d-7cc8-a885-a17639ac6918" 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_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_019cd350-832d-7cc8-a885-a17639ac6918" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtInstrumentConvertibleMinimumPrincipalAmountOutstanding_019cd350-832d-79e1-99b8-f4d8be87b35d" xlink:href="hims-20260331.xsd#hims_DebtInstrumentConvertibleMinimumPrincipalAmountOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_hims_DebtInstrumentConvertibleMinimumPrincipalAmountOutstanding_019cd350-832d-79e1-99b8-f4d8be87b35d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtInstrumentInterestRateConditionalPercentage_019cd350-832d-76f7-9381-1d3bba7d41c9" xlink:href="hims-20260331.xsd#hims_DebtInstrumentInterestRateConditionalPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_hims_DebtInstrumentInterestRateConditionalPercentage_019cd350-832d-76f7-9381-1d3bba7d41c9" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtInstrumentDebtDefaultSpecialInterestPercentageOfPrincipal_019cd350-832d-7d08-bcd6-765e35e753ef" xlink:href="hims-20260331.xsd#hims_DebtInstrumentDebtDefaultSpecialInterestPercentageOfPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_hims_DebtInstrumentDebtDefaultSpecialInterestPercentageOfPrincipal_019cd350-832d-7d08-bcd6-765e35e753ef" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtInstrumentMaximumAdditionalInterestPercentageOfPrincipal_019cd350-832d-7958-9f44-ca1c8df6a675" xlink:href="hims-20260331.xsd#hims_DebtInstrumentMaximumAdditionalInterestPercentageOfPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_hims_DebtInstrumentMaximumAdditionalInterestPercentageOfPrincipal_019cd350-832d-7958-9f44-ca1c8df6a675" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_019cd350-832d-7530-bce0-e6811f4cab7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_019cd350-832d-7530-bce0-e6811f4cab7c" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019cd350-832d-7324-9db8-54e8123bb701" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019cd350-832d-7324-9db8-54e8123bb701" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPaymentInterest_019cd350-832d-7456-b648-29a57093c602" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentPeriodicPaymentInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_DebtInstrumentPeriodicPaymentInterest_019cd350-832d-7456-b648-29a57093c602" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_019cd350-832d-7fe8-9246-410edae3a3ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_DebtInstrumentFairValue_019cd350-832d-7fe8-9246-410edae3a3ec" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_AdditionalPaidInCapitalCappedCalls_019cd350-832d-7a40-ab33-fdccb5f9da9e" xlink:href="hims-20260331.xsd#hims_AdditionalPaidInCapitalCappedCalls"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_hims_AdditionalPaidInCapitalCappedCalls_019cd350-832d-7a40-ab33-fdccb5f9da9e" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_CashPaidCappedCalls_019cd350-832d-7a6e-b65b-b097f00d6b1e" xlink:href="hims-20260331.xsd#hims_CashPaidCappedCalls"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_hims_CashPaidCappedCalls_019cd350-832d-7a6e-b65b-b097f00d6b1e" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DeferredTaxImpactCappedCalls_019cd350-832d-7103-a872-dbf4f0d98771" xlink:href="hims-20260331.xsd#hims_DeferredTaxImpactCappedCalls"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_hims_DeferredTaxImpactCappedCalls_019cd350-832d-7103-a872-dbf4f0d98771" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_CappedCallsInitialStrikePricePerShare_019cd350-832d-7afc-9e3e-07688a6c9973" xlink:href="hims-20260331.xsd#hims_CappedCallsInitialStrikePricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_hims_CappedCallsInitialStrikePricePerShare_019cd350-832d-7afc-9e3e-07688a6c9973" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_CappedCallsInitialCapPricePerShare_019cd350-832d-7aea-911d-6d425bc3972e" xlink:href="hims-20260331.xsd#hims_CappedCallsInitialCapPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_hims_CappedCallsInitialCapPricePerShare_019cd350-832d-7aea-911d-6d425bc3972e" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_019cd350-832d-72bd-a2d4-5c4a12096b23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_DebtInstrumentTerm_019cd350-832d-72bd-a2d4-5c4a12096b23" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019cd350-832d-7ac5-b67c-719ee6529d60" 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_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019cd350-832d-7ac5-b67c-719ee6529d60" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_LineOfCreditFacilityAccordionFeatureIncreaseLimit_019cd350-832d-7262-b7f2-7abc4b8066bb" xlink:href="hims-20260331.xsd#hims_LineOfCreditFacilityAccordionFeatureIncreaseLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_hims_LineOfCreditFacilityAccordionFeatureIncreaseLimit_019cd350-832d-7262-b7f2-7abc4b8066bb" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019cd350-832d-7a67-92ce-49dd6076fb26" 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_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019cd350-832d-7a67-92ce-49dd6076fb26" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_019cd350-832d-78ac-a9fc-b0841a383a63" 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_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_019cd350-832d-78ac-a9fc-b0841a383a63" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_LineOfCreditFacilityFrontingFeePercentage_019cd350-832d-7600-ba85-4d2fb50bdaef" xlink:href="hims-20260331.xsd#hims_LineOfCreditFacilityFrontingFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_hims_LineOfCreditFacilityFrontingFeePercentage_019cd350-832d-7600-ba85-4d2fb50bdaef" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtInstrumentCovenantLeverageRatioMaximum_019cd350-832d-7732-89bc-4c1b8a2e1b6f" xlink:href="hims-20260331.xsd#hims_DebtInstrumentCovenantLeverageRatioMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_hims_DebtInstrumentCovenantLeverageRatioMaximum_019cd350-832d-7732-89bc-4c1b8a2e1b6f" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DebtInstrumentCovenantInterestCoverageRatioMaximum_019cd350-832d-758d-8b0b-ceaed45c8d8e" xlink:href="hims-20260331.xsd#hims_DebtInstrumentCovenantInterestCoverageRatioMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_hims_DebtInstrumentCovenantInterestCoverageRatioMaximum_019cd350-832d-758d-8b0b-ceaed45c8d8e" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_019cd350-832d-760c-a80f-d0cb4497be1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_019cd350-832d-760c-a80f-d0cb4497be1d" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019cd350-832d-74c3-b9a7-52ac3bf0a99d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019cd350-832d-74c3-b9a7-52ac3bf0a99d" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019cd350-832d-7c39-816e-b2bfe9beab4c" 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_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019cd350-832d-7c39-816e-b2bfe9beab4c" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019d1c60-aadd-7760-b165-f63bab27f7eb" 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_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019d1c60-aadd-7760-b165-f63bab27f7eb" xlink:type="arc" order="33"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_019d1c61-b0e8-7fd0-9794-91272719e074" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_019d1c61-b0e8-7fd0-9794-91272719e074" xlink:type="arc" order="34"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019d1c61-f468-7f58-9b37-33d63089a319" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7037-bcdc-b24f7bb85d50" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019d1c61-f468-7f58-9b37-33d63089a319" xlink:type="arc" order="35"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/DebtScheduleofLongTermDebtInstrumentsDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#DebtScheduleofLongTermDebtInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/DebtScheduleofLongTermDebtInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7333-ac46-6c4d1fff1911" 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_019cd350-832d-767e-92e6-e6fe3a1165b8" 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_019cd350-832d-7333-ac46-6c4d1fff1911" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_019cd350-832d-767e-92e6-e6fe3a1165b8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019cd350-832d-783b-99eb-c11e89e1c4a8" 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_019cd350-832d-767e-92e6-e6fe3a1165b8" xlink:to="loc_us-gaap_DebtInstrumentAxis_019cd350-832d-783b-99eb-c11e89e1c4a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019cd350-832d-783b-99eb-c11e89e1c4a8_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_019cd350-832d-783b-99eb-c11e89e1c4a8" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019cd350-832d-783b-99eb-c11e89e1c4a8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019cd350-832d-7c82-b67a-65758f2434f5" 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_019cd350-832d-783b-99eb-c11e89e1c4a8" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019cd350-832d-7c82-b67a-65758f2434f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ConvertibleSeniorNotesDue2030Member_019cd350-832d-7c3f-98fb-536c873d3007" xlink:href="hims-20260331.xsd#hims_ConvertibleSeniorNotesDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cd350-832d-7c82-b67a-65758f2434f5" xlink:to="loc_hims_ConvertibleSeniorNotesDue2030Member_019cd350-832d-7c3f-98fb-536c873d3007" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019cd350-832d-74ba-8821-de603e53d4e8" 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_019cd350-832d-767e-92e6-e6fe3a1165b8" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019cd350-832d-74ba-8821-de603e53d4e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019cd350-832d-74ba-8821-de603e53d4e8_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_019cd350-832d-74ba-8821-de603e53d4e8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019cd350-832d-74ba-8821-de603e53d4e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019cd350-832d-7934-a64d-a9c175b95837" 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_019cd350-832d-74ba-8821-de603e53d4e8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019cd350-832d-7934-a64d-a9c175b95837" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_019cd350-832d-774e-bc35-28b2e0412b03" 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_019cd350-832d-7934-a64d-a9c175b95837" xlink:to="loc_us-gaap_ConvertibleDebtMember_019cd350-832d-774e-bc35-28b2e0412b03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019cd350-832d-7122-8f31-e48f887ff3c4" 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_019cd350-832d-7333-ac46-6c4d1fff1911" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019cd350-832d-7122-8f31-e48f887ff3c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019cd350-832d-7452-ae11-8225291e4f74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019cd350-832d-7333-ac46-6c4d1fff1911" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019cd350-832d-7452-ae11-8225291e4f74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019cd350-832d-7049-a255-a65c24e5fb60" 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_LineOfCreditFacilityLineItems_019cd350-832d-7333-ac46-6c4d1fff1911" xlink:to="loc_us-gaap_LongTermDebt_019cd350-832d-7049-a255-a65c24e5fb60" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/CommitmentsandContingenciesDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#CommitmentsandContingenciesDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/CommitmentsandContingenciesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_019d1d08-3e0d-7773-819c-8dfa8e7e71df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_019d1d08-3e0d-75f3-8fc8-5aae2dc31fca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_019d1d08-3e0d-7773-819c-8dfa8e7e71df" xlink:to="loc_us-gaap_LossContingenciesTable_019d1d08-3e0d-75f3-8fc8-5aae2dc31fca" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_019d1d08-3e0d-773a-a467-cf291f61c9b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsByNatureAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019d1d08-3e0d-75f3-8fc8-5aae2dc31fca" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_019d1d08-3e0d-773a-a467-cf291f61c9b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_019d1d08-3e0d-773a-a467-cf291f61c9b7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_019d1d08-3e0d-773a-a467-cf291f61c9b7" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_019d1d08-3e0d-773a-a467-cf291f61c9b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_019d1d08-3e0d-70a3-a486-ebe6b30f4ea3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_019d1d08-3e0d-773a-a467-cf291f61c9b7" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_019d1d08-3e0d-70a3-a486-ebe6b30f4ea3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndemnificationGuaranteeMember_019d1d08-3e0d-75a5-9b43-90cabee55a16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndemnificationGuaranteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_019d1d08-3e0d-70a3-a486-ebe6b30f4ea3" xlink:to="loc_us-gaap_IndemnificationGuaranteeMember_019d1d08-3e0d-75a5-9b43-90cabee55a16" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligation_019cd350-832d-7ef4-a2ba-f943f7c49c6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019d1d08-3e0d-7773-819c-8dfa8e7e71df" xlink:to="loc_us-gaap_PurchaseObligation_019cd350-832d-7ef4-a2ba-f943f7c49c6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear_019cd350-832d-708d-94fa-2ef1e3637d2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019d1d08-3e0d-7773-819c-8dfa8e7e71df" xlink:to="loc_us-gaap_PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear_019cd350-832d-708d-94fa-2ef1e3637d2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInNextTwelveMonths_019cd350-832d-71cf-ac0b-d4079bc63c0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationDueInNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019d1d08-3e0d-7773-819c-8dfa8e7e71df" xlink:to="loc_us-gaap_PurchaseObligationDueInNextTwelveMonths_019cd350-832d-71cf-ac0b-d4079bc63c0a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInSecondYear_019cd350-832d-7373-8c61-7b7b21dca632" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationDueInSecondYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019d1d08-3e0d-7773-819c-8dfa8e7e71df" xlink:to="loc_us-gaap_PurchaseObligationDueInSecondYear_019cd350-832d-7373-8c61-7b7b21dca632" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInThirdYear_019cd350-832d-7e80-ae0a-45859c7c83ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationDueInThirdYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019d1d08-3e0d-7773-819c-8dfa8e7e71df" xlink:to="loc_us-gaap_PurchaseObligationDueInThirdYear_019cd350-832d-7e80-ae0a-45859c7c83ab" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInFourthYear_019cd350-832d-7721-909f-d8fd13554f00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligationDueInFourthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019d1d08-3e0d-7773-819c-8dfa8e7e71df" xlink:to="loc_us-gaap_PurchaseObligationDueInFourthYear_019cd350-832d-7721-909f-d8fd13554f00" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_019d1c5e-de20-79f9-ad18-ae49e6ee1c81" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsMaximumExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019d1d08-3e0d-7773-819c-8dfa8e7e71df" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_019d1c5e-de20-79f9-ad18-ae49e6ee1c81" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualCarryingValueCurrent_019df9ac-38d4-77a5-91ed-474a2ad6b379" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyAccrualCarryingValueCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019d1d08-3e0d-7773-819c-8dfa8e7e71df" xlink:to="loc_us-gaap_LossContingencyAccrualCarryingValueCurrent_019df9ac-38d4-77a5-91ed-474a2ad6b379" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNewClaimsFiledNumber_019d1c7a-fcfe-7cbd-8924-f9bfa08dea54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNewClaimsFiledNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019d1d08-3e0d-7773-819c-8dfa8e7e71df" xlink:to="loc_us-gaap_LossContingencyNewClaimsFiledNumber_019d1c7a-fcfe-7cbd-8924-f9bfa08dea54" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/StockholdersEquityCommonStockDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#StockholdersEquityCommonStockDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/StockholdersEquityCommonStockDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7666-b31e-fbd60d5e58f1" 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_019cd350-832d-790c-87ac-770cd7395946" 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_019cd350-832d-7666-b31e-fbd60d5e58f1" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-790c-87ac-770cd7395946" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cd350-832d-79ed-a9bb-2c22523f508b" 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_019cd350-832d-790c-87ac-770cd7395946" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cd350-832d-79ed-a9bb-2c22523f508b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cd350-832d-79ed-a9bb-2c22523f508b_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_019cd350-832d-79ed-a9bb-2c22523f508b" xlink:to="loc_us-gaap_ClassOfStockDomain_019cd350-832d-79ed-a9bb-2c22523f508b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cd350-832d-7c7d-ac2f-26b49a64e13a" 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_019cd350-832d-79ed-a9bb-2c22523f508b" xlink:to="loc_us-gaap_ClassOfStockDomain_019cd350-832d-7c7d-ac2f-26b49a64e13a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019cd350-832d-7341-b857-c377a73ed027" 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_019cd350-832d-7c7d-ac2f-26b49a64e13a" xlink:to="loc_us-gaap_CommonClassAMember_019cd350-832d-7341-b857-c377a73ed027" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_NumberOfClassesOfCommonStock_019cd350-832d-779b-837b-41b5f8e849cf" xlink:href="hims-20260331.xsd#hims_NumberOfClassesOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7666-b31e-fbd60d5e58f1" xlink:to="loc_hims_NumberOfClassesOfCommonStock_019cd350-832d-779b-837b-41b5f8e849cf" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/StockholdersEquityShareRepurchaseProgramDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#StockholdersEquityShareRepurchaseProgramDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/StockholdersEquityShareRepurchaseProgramDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7453-b96d-0b73545c3fdb" 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_019cd350-832d-7ca5-9077-aedd3e9d2cce" 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_019cd350-832d-7453-b96d-0b73545c3fdb" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-7ca5-9077-aedd3e9d2cce" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cd350-832d-7a63-a908-1b4254804318" 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_019cd350-832d-7ca5-9077-aedd3e9d2cce" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cd350-832d-7a63-a908-1b4254804318" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cd350-832d-7a63-a908-1b4254804318_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_019cd350-832d-7a63-a908-1b4254804318" xlink:to="loc_us-gaap_ClassOfStockDomain_019cd350-832d-7a63-a908-1b4254804318_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cd350-832d-7e44-9042-b136ef4c23af" 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_019cd350-832d-7a63-a908-1b4254804318" xlink:to="loc_us-gaap_ClassOfStockDomain_019cd350-832d-7e44-9042-b136ef4c23af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019cd350-832d-724f-8548-695d1ad67552" 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_019cd350-832d-7e44-9042-b136ef4c23af" xlink:to="loc_us-gaap_CommonClassAMember_019cd350-832d-724f-8548-695d1ad67552" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_019cd350-832d-7931-b463-9f4b7cb9052b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-7ca5-9077-aedd3e9d2cce" xlink:to="loc_srt_ShareRepurchaseProgramAxis_019cd350-832d-7931-b463-9f4b7cb9052b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019cd350-832d-7931-b463-9f4b7cb9052b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019cd350-832d-7931-b463-9f4b7cb9052b" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019cd350-832d-7931-b463-9f4b7cb9052b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019cd350-832d-7da7-abd8-86fa9f3471ee" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019cd350-832d-7931-b463-9f4b7cb9052b" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019cd350-832d-7da7-abd8-86fa9f3471ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_A2024ShareRepurchaseProgramMember_019cd350-832d-70b0-8d7c-6ea52cd5c496" xlink:href="hims-20260331.xsd#hims_A2024ShareRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019cd350-832d-7da7-abd8-86fa9f3471ee" xlink:to="loc_hims_A2024ShareRepurchaseProgramMember_019cd350-832d-70b0-8d7c-6ea52cd5c496" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_A2025ShareRepurchaseProgramMember_019d1c69-1af1-7794-9291-bc0124d651b5" xlink:href="hims-20260331.xsd#hims_A2025ShareRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019cd350-832d-7da7-abd8-86fa9f3471ee" xlink:to="loc_hims_A2025ShareRepurchaseProgramMember_019d1c69-1af1-7794-9291-bc0124d651b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019cd350-832d-7823-b0cf-16a42271e85e" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7453-b96d-0b73545c3fdb" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019cd350-832d-7823-b0cf-16a42271e85e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_019cd350-832d-759d-bc06-74371693b6fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7453-b96d-0b73545c3fdb" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_019cd350-832d-759d-bc06-74371693b6fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019cd350-832d-7f0a-a5be-114033eb23e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7453-b96d-0b73545c3fdb" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019cd350-832d-7f0a-a5be-114033eb23e6" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/StockholdersEquityRSUReleasesDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#StockholdersEquityRSUReleasesDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/StockholdersEquityRSUReleasesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7b9c-8ed3-e5d6d5e4b033" 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_019cd350-832d-7509-ac87-607187b337ea" 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_019cd350-832d-7b9c-8ed3-e5d6d5e4b033" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-7509-ac87-607187b337ea" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019cd350-832d-74ee-9fb0-fff813625e5c" 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_019cd350-832d-7509-ac87-607187b337ea" xlink:to="loc_us-gaap_AwardTypeAxis_019cd350-832d-74ee-9fb0-fff813625e5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-74ee-9fb0-fff813625e5c_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_019cd350-832d-74ee-9fb0-fff813625e5c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-74ee-9fb0-fff813625e5c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-79e0-bff2-7090ea2f71e0" 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_019cd350-832d-74ee-9fb0-fff813625e5c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-79e0-bff2-7090ea2f71e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019cd350-832d-7950-8410-dfd561a7f62b" 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_019cd350-832d-79e0-bff2-7090ea2f71e0" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019cd350-832d-7950-8410-dfd561a7f62b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cd350-832d-72a5-831a-795059afd82b" 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_019cd350-832d-7509-ac87-607187b337ea" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cd350-832d-72a5-831a-795059afd82b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cd350-832d-72a5-831a-795059afd82b_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_019cd350-832d-72a5-831a-795059afd82b" xlink:to="loc_us-gaap_ClassOfStockDomain_019cd350-832d-72a5-831a-795059afd82b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cd350-832d-73ce-a9c8-f899c819fa20" 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_019cd350-832d-72a5-831a-795059afd82b" xlink:to="loc_us-gaap_ClassOfStockDomain_019cd350-832d-73ce-a9c8-f899c819fa20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019cd350-832d-7cfb-ad06-35943ba52698" 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_019cd350-832d-73ce-a9c8-f899c819fa20" xlink:to="loc_us-gaap_CommonClassAMember_019cd350-832d-7cfb-ad06-35943ba52698" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_019cd350-832d-7fcf-983f-b9583388f098" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7b9c-8ed3-e5d6d5e4b033" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_019cd350-832d-7fcf-983f-b9583388f098" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019cd350-832d-7b5e-a10a-430319faae49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7b9c-8ed3-e5d6d5e4b033" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019cd350-832d-7b5e-a10a-430319faae49" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/StockholdersEquity2017StockPlanand2020EquityIncentivePlanDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#StockholdersEquity2017StockPlanand2020EquityIncentivePlanDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/StockholdersEquity2017StockPlanand2020EquityIncentivePlanDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7bcd-ae41-a644bc74cbd1" 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_019cd350-832d-7e4b-b377-6491bb6ae68a" 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_019cd350-832d-7bcd-ae41-a644bc74cbd1" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-7e4b-b377-6491bb6ae68a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_019cd350-832d-70e9-b4b8-d7965fbe4dda" 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_019cd350-832d-7e4b-b377-6491bb6ae68a" xlink:to="loc_us-gaap_PlanNameAxis_019cd350-832d-70e9-b4b8-d7965fbe4dda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019cd350-832d-70e9-b4b8-d7965fbe4dda_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_019cd350-832d-70e9-b4b8-d7965fbe4dda" xlink:to="loc_us-gaap_PlanNameDomain_019cd350-832d-70e9-b4b8-d7965fbe4dda_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019cd350-832d-74cf-ab16-5225c9cb0a72" 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_019cd350-832d-70e9-b4b8-d7965fbe4dda" xlink:to="loc_us-gaap_PlanNameDomain_019cd350-832d-74cf-ab16-5225c9cb0a72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_EquityIncentivePlan2020Member_019cd350-832d-7437-96fb-c08e8b8b5b04" xlink:href="hims-20260331.xsd#hims_EquityIncentivePlan2020Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019cd350-832d-74cf-ab16-5225c9cb0a72" xlink:to="loc_hims_EquityIncentivePlan2020Member_019cd350-832d-7437-96fb-c08e8b8b5b04" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_StockPlan2017Member_019cd350-832d-7b0f-9baa-3021118b1485" xlink:href="hims-20260331.xsd#hims_StockPlan2017Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019cd350-832d-74cf-ab16-5225c9cb0a72" xlink:to="loc_hims_StockPlan2017Member_019cd350-832d-7b0f-9baa-3021118b1485" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019cd350-832d-7bb0-8f34-a16648c16ff4" 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_019cd350-832d-7e4b-b377-6491bb6ae68a" xlink:to="loc_us-gaap_AwardTypeAxis_019cd350-832d-7bb0-8f34-a16648c16ff4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-7bb0-8f34-a16648c16ff4_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_019cd350-832d-7bb0-8f34-a16648c16ff4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-7bb0-8f34-a16648c16ff4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-752d-9906-80016d0cbe31" 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_019cd350-832d-7bb0-8f34-a16648c16ff4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-752d-9906-80016d0cbe31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_019cd350-832d-7788-a8c6-16286036d293" 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_019cd350-832d-752d-9906-80016d0cbe31" xlink:to="loc_us-gaap_EmployeeStockMember_019cd350-832d-7788-a8c6-16286036d293" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cd350-832d-7d5b-9f5d-0f8b11d5f7f2" 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_019cd350-832d-7e4b-b377-6491bb6ae68a" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cd350-832d-7d5b-9f5d-0f8b11d5f7f2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cd350-832d-7d5b-9f5d-0f8b11d5f7f2_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_019cd350-832d-7d5b-9f5d-0f8b11d5f7f2" xlink:to="loc_us-gaap_ClassOfStockDomain_019cd350-832d-7d5b-9f5d-0f8b11d5f7f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cd350-832d-7891-9807-ba89a485f165" 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_019cd350-832d-7d5b-9f5d-0f8b11d5f7f2" xlink:to="loc_us-gaap_ClassOfStockDomain_019cd350-832d-7891-9807-ba89a485f165" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019cd350-832d-702b-bb44-80724be57757" 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_019cd350-832d-7891-9807-ba89a485f165" xlink:to="loc_us-gaap_CommonClassAMember_019cd350-832d-702b-bb44-80724be57757" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019cd350-832d-70cf-8cf0-e739ef40a1a6" 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_019cd350-832d-7e4b-b377-6491bb6ae68a" xlink:to="loc_srt_RangeAxis_019cd350-832d-70cf-8cf0-e739ef40a1a6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd350-832d-70cf-8cf0-e739ef40a1a6_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_019cd350-832d-70cf-8cf0-e739ef40a1a6" xlink:to="loc_srt_RangeMember_019cd350-832d-70cf-8cf0-e739ef40a1a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd350-832d-70c3-83e7-bea6931b2589" 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_019cd350-832d-70cf-8cf0-e739ef40a1a6" xlink:to="loc_srt_RangeMember_019cd350-832d-70c3-83e7-bea6931b2589" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019cd350-832d-7108-adba-243f77614115" 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_019cd350-832d-70c3-83e7-bea6931b2589" xlink:to="loc_srt_MaximumMember_019cd350-832d-7108-adba-243f77614115" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_019cd350-832d-7a59-883b-5d07483cf509" 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_019cd350-832d-7bcd-ae41-a644bc74cbd1" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_019cd350-832d-7a59-883b-5d07483cf509" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_019cd350-832d-71d4-a4fd-0886de718729" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7bcd-ae41-a644bc74cbd1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_019cd350-832d-71d4-a4fd-0886de718729" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageAnnualIncreaseInAuthorizedSharesOfCommonStock_019cd350-832d-70f1-b6bf-7a44a57f934c" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageAnnualIncreaseInAuthorizedSharesOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7bcd-ae41-a644bc74cbd1" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageAnnualIncreaseInAuthorizedSharesOfCommonStock_019cd350-832d-70f1-b6bf-7a44a57f934c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_019cd350-832d-7fe8-bf44-af74c51020d6" 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_019cd350-832d-7bcd-ae41-a644bc74cbd1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_019cd350-832d-7fe8-bf44-af74c51020d6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAuthorizedSharesTransferredBetweenPlansCumulative_019cd350-832d-74c4-9c8d-3e16d017f68e" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAuthorizedSharesTransferredBetweenPlansCumulative"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7bcd-ae41-a644bc74cbd1" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAuthorizedSharesTransferredBetweenPlansCumulative_019cd350-832d-74c4-9c8d-3e16d017f68e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAddedToReserve_019cd350-832d-7613-8f41-6e7714d033d2" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAddedToReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7bcd-ae41-a644bc74cbd1" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAddedToReserve_019cd350-832d-7613-8f41-6e7714d033d2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum_019cd350-832d-7588-9953-7ee99cf7dcbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7bcd-ae41-a644bc74cbd1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum_019cd350-832d-7588-9953-7ee99cf7dcbd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesBenchmark_019cd350-832d-7300-98a2-1850834932b7" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesBenchmark"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7bcd-ae41-a644bc74cbd1" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesBenchmark_019cd350-832d-7300-98a2-1850834932b7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_019cd350-832d-72da-af2a-07163634825d" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7bcd-ae41-a644bc74cbd1" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_019cd350-832d-72da-af2a-07163634825d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_019cd350-832d-7569-b2bd-3d5076467412" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7bcd-ae41-a644bc74cbd1" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_019cd350-832d-7569-b2bd-3d5076467412" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockPlanOfferingPeriod_019cd350-832d-7fe7-ac18-7cc2e42580d2" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockPlanOfferingPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7bcd-ae41-a644bc74cbd1" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockPlanOfferingPeriod_019cd350-832d-7fe7-ac18-7cc2e42580d2" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent_019cd350-832d-7c88-90ec-0b147bc7cc16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7bcd-ae41-a644bc74cbd1" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent_019cd350-832d-7c88-90ec-0b147bc7cc16" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019cd350-832d-7472-9527-53a671b511b6" 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_019cd350-832d-7bcd-ae41-a644bc74cbd1" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019cd350-832d-7472-9527-53a671b511b6" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/StockholdersEquityStockOptionsNarrativeDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#StockholdersEquityStockOptionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/StockholdersEquityStockOptionsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7095-b81a-f33d1329a875" 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_019cd350-832d-7970-92fe-b6a9249680bb" 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_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-7970-92fe-b6a9249680bb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019cd350-832d-78f7-81c2-12588d82c82d" 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_019cd350-832d-7970-92fe-b6a9249680bb" xlink:to="loc_us-gaap_AwardTypeAxis_019cd350-832d-78f7-81c2-12588d82c82d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-78f7-81c2-12588d82c82d_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_019cd350-832d-78f7-81c2-12588d82c82d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-78f7-81c2-12588d82c82d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-7ca0-bc8e-206e500af78b" 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_019cd350-832d-78f7-81c2-12588d82c82d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-7ca0-bc8e-206e500af78b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_019cd350-832d-72e4-ab73-d7a11f2ef78f" 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_019cd350-832d-7ca0-bc8e-206e500af78b" xlink:to="loc_us-gaap_EmployeeStockOptionMember_019cd350-832d-72e4-ab73-d7a11f2ef78f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_019cd350-832d-70bb-9a48-16f95ba5c3f0" 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_019cd350-832d-7ca0-bc8e-206e500af78b" xlink:to="loc_us-gaap_EmployeeStockMember_019cd350-832d-70bb-9a48-16f95ba5c3f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusAxis_019cd350-832d-7aa6-94f9-3b043bb50633" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-7970-92fe-b6a9249680bb" xlink:to="loc_us-gaap_GranteeStatusAxis_019cd350-832d-7aa6-94f9-3b043bb50633" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_019cd350-832d-7aa6-94f9-3b043bb50633_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GranteeStatusAxis_019cd350-832d-7aa6-94f9-3b043bb50633" xlink:to="loc_us-gaap_GranteeStatusDomain_019cd350-832d-7aa6-94f9-3b043bb50633_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_019cd350-832d-71f2-8e1b-450de23efe93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GranteeStatusAxis_019cd350-832d-7aa6-94f9-3b043bb50633" xlink:to="loc_us-gaap_GranteeStatusDomain_019cd350-832d-71f2-8e1b-450de23efe93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedPaymentArrangementNewEmployeeMember_019cd350-832d-72c8-8fa4-cb0d728f783f" xlink:href="hims-20260331.xsd#hims_ShareBasedPaymentArrangementNewEmployeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GranteeStatusDomain_019cd350-832d-71f2-8e1b-450de23efe93" xlink:to="loc_hims_ShareBasedPaymentArrangementNewEmployeeMember_019cd350-832d-72c8-8fa4-cb0d728f783f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedPaymentArrangementCurrentEmployeeMember_019cd350-832d-7ec1-934b-db03019e7ad9" xlink:href="hims-20260331.xsd#hims_ShareBasedPaymentArrangementCurrentEmployeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GranteeStatusDomain_019cd350-832d-71f2-8e1b-450de23efe93" xlink:to="loc_hims_ShareBasedPaymentArrangementCurrentEmployeeMember_019cd350-832d-7ec1-934b-db03019e7ad9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedPaymentArrangementEmployeeMember_019cd350-832d-7097-a78d-4f0557983802" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedPaymentArrangementEmployeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GranteeStatusDomain_019cd350-832d-71f2-8e1b-450de23efe93" xlink:to="loc_us-gaap_ShareBasedPaymentArrangementEmployeeMember_019cd350-832d-7097-a78d-4f0557983802" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_019cd350-832d-7393-a0d8-4e0cd604a238" 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_019cd350-832d-7970-92fe-b6a9249680bb" xlink:to="loc_us-gaap_VestingAxis_019cd350-832d-7393-a0d8-4e0cd604a238" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_019cd350-832d-7393-a0d8-4e0cd604a238_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_019cd350-832d-7393-a0d8-4e0cd604a238" xlink:to="loc_us-gaap_VestingDomain_019cd350-832d-7393-a0d8-4e0cd604a238_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_019cd350-832d-7c57-938e-ce436e44ff4b" 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_019cd350-832d-7393-a0d8-4e0cd604a238" xlink:to="loc_us-gaap_VestingDomain_019cd350-832d-7c57-938e-ce436e44ff4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_019cd350-832d-7145-ac6f-b538b8320141" 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_019cd350-832d-7c57-938e-ce436e44ff4b" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_019cd350-832d-7145-ac6f-b538b8320141" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_019cd350-832d-71f1-a7fa-1ce5dd461871" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-7970-92fe-b6a9249680bb" xlink:to="loc_srt_TitleOfIndividualAxis_019cd350-832d-71f1-a7fa-1ce5dd461871" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cd350-832d-71f1-a7fa-1ce5dd461871_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_019cd350-832d-71f1-a7fa-1ce5dd461871" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cd350-832d-71f1-a7fa-1ce5dd461871_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cd350-832d-7abe-afc2-74063c2af2f4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_019cd350-832d-71f1-a7fa-1ce5dd461871" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cd350-832d-7abe-afc2-74063c2af2f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ChiefExecutiveOfficerMember_019cd350-832d-7a8e-abfc-cdbe6dab677d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ChiefExecutiveOfficerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cd350-832d-7abe-afc2-74063c2af2f4" xlink:to="loc_srt_ChiefExecutiveOfficerMember_019cd350-832d-7a8e-abfc-cdbe6dab677d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateAxis_019cd350-832d-78db-ad17-287533af50ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-7970-92fe-b6a9249680bb" xlink:to="loc_us-gaap_AwardDateAxis_019cd350-832d-78db-ad17-287533af50ed" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateDomain_019cd350-832d-78db-ad17-287533af50ed_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardDateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardDateAxis_019cd350-832d-78db-ad17-287533af50ed" xlink:to="loc_us-gaap_AwardDateDomain_019cd350-832d-78db-ad17-287533af50ed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateDomain_019cd350-832d-7056-a5f0-d04dadfbf03e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardDateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardDateAxis_019cd350-832d-78db-ad17-287533af50ed" xlink:to="loc_us-gaap_AwardDateDomain_019cd350-832d-7056-a5f0-d04dadfbf03e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_June172020GrantMember_019cd350-832d-78ab-8fe3-e76b04c582f1" xlink:href="hims-20260331.xsd#hims_June172020GrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AwardDateDomain_019cd350-832d-7056-a5f0-d04dadfbf03e" xlink:to="loc_hims_June172020GrantMember_019cd350-832d-78ab-8fe3-e76b04c582f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_June172020GrantOneMember_019cd350-832d-7310-b493-d86c672f4d36" xlink:href="hims-20260331.xsd#hims_June172020GrantOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hims_June172020GrantMember_019cd350-832d-78ab-8fe3-e76b04c582f1" xlink:to="loc_hims_June172020GrantOneMember_019cd350-832d-7310-b493-d86c672f4d36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_June172020GrantTwoMember_019cd350-832d-7829-b5b5-4d2143cae47e" xlink:href="hims-20260331.xsd#hims_June172020GrantTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hims_June172020GrantMember_019cd350-832d-78ab-8fe3-e76b04c582f1" xlink:to="loc_hims_June172020GrantTwoMember_019cd350-832d-7829-b5b5-4d2143cae47e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_February242022GrantMember_019cd350-832d-7968-a99a-43945a25a101" xlink:href="hims-20260331.xsd#hims_February242022GrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AwardDateDomain_019cd350-832d-7056-a5f0-d04dadfbf03e" xlink:to="loc_hims_February242022GrantMember_019cd350-832d-7968-a99a-43945a25a101" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_March112025GrantMember_019cd350-832d-7613-a17e-a030d3668fb2" xlink:href="hims-20260331.xsd#hims_March112025GrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AwardDateDomain_019cd350-832d-7056-a5f0-d04dadfbf03e" xlink:to="loc_hims_March112025GrantMember_019cd350-832d-7613-a17e-a030d3668fb2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_March2026GrantMember_019d77db-ecda-7a5a-b82c-50a63b5e8eeb" xlink:href="hims-20260331.xsd#hims_March2026GrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AwardDateDomain_019cd350-832d-7056-a5f0-d04dadfbf03e" xlink:to="loc_hims_March2026GrantMember_019d77db-ecda-7a5a-b82c-50a63b5e8eeb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019cd350-832d-7e67-83d6-9105ff3b0897" 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_019cd350-832d-7970-92fe-b6a9249680bb" xlink:to="loc_srt_RangeAxis_019cd350-832d-7e67-83d6-9105ff3b0897" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd350-832d-7e67-83d6-9105ff3b0897_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_019cd350-832d-7e67-83d6-9105ff3b0897" xlink:to="loc_srt_RangeMember_019cd350-832d-7e67-83d6-9105ff3b0897_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd350-832d-70b7-b2d8-2537a29d00b2" 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_019cd350-832d-7e67-83d6-9105ff3b0897" xlink:to="loc_srt_RangeMember_019cd350-832d-70b7-b2d8-2537a29d00b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019cd350-832d-7d95-ba6f-c4ea46df9638" 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_019cd350-832d-70b7-b2d8-2537a29d00b2" xlink:to="loc_srt_MinimumMember_019cd350-832d-7d95-ba6f-c4ea46df9638" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019cd350-832d-7a50-b3fa-f353d1b4d14c" 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_019cd350-832d-70b7-b2d8-2537a29d00b2" xlink:to="loc_srt_MaximumMember_019cd350-832d-7a50-b3fa-f353d1b4d14c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019cd350-832d-7cc6-85b4-edeef07d5698" 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_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019cd350-832d-7cc6-85b4-edeef07d5698" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_019cd350-832d-7999-bafc-23ec985c51c8" 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_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_019cd350-832d-7999-bafc-23ec985c51c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedPaymentAwardAwardVestingRightsMonthlyPercentage_019cd350-832d-7042-9684-e031b3c84266" xlink:href="hims-20260331.xsd#hims_ShareBasedPaymentAwardAwardVestingRightsMonthlyPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_hims_ShareBasedPaymentAwardAwardVestingRightsMonthlyPercentage_019cd350-832d-7042-9684-e031b3c84266" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_019cd350-832d-7d23-952b-400d75c7d508" 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_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_019cd350-832d-7d23-952b-400d75c7d508" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_019cd350-832d-7c55-a8ab-447357c1c294" 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_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_019cd350-832d-7c55-a8ab-447357c1c294" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_019cd350-832d-73e0-aa9b-7bca99708cbd" 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_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_019cd350-832d-73e0-aa9b-7bca99708cbd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcquisitionWithShareConsiderationThreshold_019cd350-832d-7d76-8fab-32f47ef519d9" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcquisitionWithShareConsiderationThreshold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcquisitionWithShareConsiderationThreshold_019cd350-832d-7d76-8fab-32f47ef519d9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_019cd350-832d-7ca4-8396-93f7e5a04a7d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_019cd350-832d-7ca4-8396-93f7e5a04a7d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue_019cd350-832d-7480-a84b-23e479296be7" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue_019cd350-832d-7480-a84b-23e479296be7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019cd350-832d-77e6-a3c2-e832f41e6fbd" 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_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019cd350-832d-77e6-a3c2-e832f41e6fbd" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_019cd350-832d-742c-8700-bc3a4e27836c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_019cd350-832d-742c-8700-bc3a4e27836c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedPaymentArrangementOptionSharePriceTrigger_019cd350-832d-7cf1-b53a-cd9026630c53" xlink:href="hims-20260331.xsd#hims_ShareBasedPaymentArrangementOptionSharePriceTrigger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_hims_ShareBasedPaymentArrangementOptionSharePriceTrigger_019cd350-832d-7cf1-b53a-cd9026630c53" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedPaymentArrangementOptionThresholdTradingDays_019cd350-832d-7712-906f-b1b4c3d38648" xlink:href="hims-20260331.xsd#hims_ShareBasedPaymentArrangementOptionThresholdTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_hims_ShareBasedPaymentArrangementOptionThresholdTradingDays_019cd350-832d-7712-906f-b1b4c3d38648" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedPaymentArrangementOptionThresholdConsecutiveTradingDays_019cd350-832d-7eb1-99bc-d675ef1a8b73" xlink:href="hims-20260331.xsd#hims_ShareBasedPaymentArrangementOptionThresholdConsecutiveTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_hims_ShareBasedPaymentArrangementOptionThresholdConsecutiveTradingDays_019cd350-832d-7eb1-99bc-d675ef1a8b73" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriod_019cd350-832d-7e80-a252-183bb0f6e958" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriod_019cd350-832d-7e80-a252-183bb0f6e958" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriod_019cd350-832d-7543-be81-7523a647d567" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriod_019cd350-832d-7543-be81-7523a647d567" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_019cd350-832d-7afd-86d9-b780150384b3" 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_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_019cd350-832d-7afd-86d9-b780150384b3" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019cd350-832d-7da3-bf55-eacc6ea88a14" 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_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019cd350-832d-7da3-bf55-eacc6ea88a14" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_019cd350-832d-731b-aa6c-6989e2615ab0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_019cd350-832d-731b-aa6c-6989e2615ab0" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_019cd350-832d-7bc0-b9d1-4abf5b230e15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_019cd350-832d-7bc0-b9d1-4abf5b230e15" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_019cd350-832d-79ed-8625-ea6d5a9c1dac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_019cd350-832d-79ed-8625-ea6d5a9c1dac" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_019cd350-832d-797f-aa42-75ef39002070" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_019cd350-832d-797f-aa42-75ef39002070" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_019cd350-832d-7150-beb8-631f64e892c0" 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_019cd350-832d-7095-b81a-f33d1329a875" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_019cd350-832d-7150-beb8-631f64e892c0" xlink:type="arc" order="22"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/StockholdersEquityOptionActivityDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#StockholdersEquityOptionActivityDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/StockholdersEquityOptionActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7b0d-b94a-2d70d0158a5e" 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_019cd350-832d-71e0-b0e6-cc2a70db259f" 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_019cd350-832d-7b0d-b94a-2d70d0158a5e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-71e0-b0e6-cc2a70db259f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusAxis_019cd350-832d-7e2b-abbe-b278addb0baf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-71e0-b0e6-cc2a70db259f" xlink:to="loc_us-gaap_GranteeStatusAxis_019cd350-832d-7e2b-abbe-b278addb0baf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_019cd350-832d-7e2b-abbe-b278addb0baf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GranteeStatusAxis_019cd350-832d-7e2b-abbe-b278addb0baf" xlink:to="loc_us-gaap_GranteeStatusDomain_019cd350-832d-7e2b-abbe-b278addb0baf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_019cd350-832d-7981-a07d-db7872a1b873" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GranteeStatusAxis_019cd350-832d-7e2b-abbe-b278addb0baf" xlink:to="loc_us-gaap_GranteeStatusDomain_019cd350-832d-7981-a07d-db7872a1b873" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedPaymentArrangementEmployeeExcludingCEOMember_019cd350-832d-7d42-805d-ecdf8eec4cb6" xlink:href="hims-20260331.xsd#hims_ShareBasedPaymentArrangementEmployeeExcludingCEOMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GranteeStatusDomain_019cd350-832d-7981-a07d-db7872a1b873" xlink:to="loc_hims_ShareBasedPaymentArrangementEmployeeExcludingCEOMember_019cd350-832d-7d42-805d-ecdf8eec4cb6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_019cd350-832d-7395-99eb-03c99e452b4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7b0d-b94a-2d70d0158a5e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_019cd350-832d-7395-99eb-03c99e452b4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_019cd350-832d-7646-b5bd-3b9514b50eab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_019cd350-832d-7395-99eb-03c99e452b4d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_019cd350-832d-7646-b5bd-3b9514b50eab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019cd350-832d-73ce-8a4f-6aa01425cdfa" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_019cd350-832d-7395-99eb-03c99e452b4d" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019cd350-832d-73ce-8a4f-6aa01425cdfa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_019cd350-832d-7966-8457-ab4e9f71581a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_019cd350-832d-7395-99eb-03c99e452b4d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_019cd350-832d-7966-8457-ab4e9f71581a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_019cd350-832d-7a40-96ef-08557bfcadfd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_019cd350-832d-781c-958d-bf1f13025d0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7b0d-b94a-2d70d0158a5e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_019cd350-832d-781c-958d-bf1f13025d0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019cd350-832d-74a1-bdca-499d529861f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7b0d-b94a-2d70d0158a5e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019cd350-832d-74a1-bdca-499d529861f9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_019cd350-832d-711c-bd64-574c5d512689" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019cd350-832d-74a1-bdca-499d529861f9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_019cd350-832d-711c-bd64-574c5d512689" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_019cd350-832d-7551-a03b-24cf55d4e654" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019cd350-832d-74a1-bdca-499d529861f9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_019cd350-832d-7551-a03b-24cf55d4e654" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_019cd350-832d-7f48-bd23-4a8b23e2b692" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019cd350-832d-74a1-bdca-499d529861f9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_019cd350-832d-7f48-bd23-4a8b23e2b692" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_019cd350-832d-7bee-ac74-44099ce62596" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019cd350-832d-74a1-bdca-499d529861f9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_019cd350-832d-7bee-ac74-44099ce62596" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_019cd350-832d-7ab9-8d5a-07da0e0da151" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_019cd350-832d-7474-9918-bfc84f74c2f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7b0d-b94a-2d70d0158a5e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_019cd350-832d-7474-9918-bfc84f74c2f0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019cd350-832d-7d9a-8838-bb957544bc7d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7b0d-b94a-2d70d0158a5e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019cd350-832d-7d9a-8838-bb957544bc7d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_019cd350-832d-7b1d-933b-f2cc0d318dc5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019cd350-832d-7d9a-8838-bb957544bc7d" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_019cd350-832d-7b1d-933b-f2cc0d318dc5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_019cd350-832d-7941-ac03-71b2f6c23d15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019cd350-832d-7d9a-8838-bb957544bc7d" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_019cd350-832d-7941-ac03-71b2f6c23d15" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueAdditionalDisclosuresAbstract_019cd350-832d-716f-8460-26285f88eb3e" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueAdditionalDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7b0d-b94a-2d70d0158a5e" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueAdditionalDisclosuresAbstract_019cd350-832d-716f-8460-26285f88eb3e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_019cd350-832d-7876-8162-e6130feef2e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueAdditionalDisclosuresAbstract_019cd350-832d-716f-8460-26285f88eb3e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_019cd350-832d-7876-8162-e6130feef2e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_019cd350-832d-779b-8bc5-f0f95a66d596" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueAdditionalDisclosuresAbstract_019cd350-832d-716f-8460-26285f88eb3e" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_019cd350-832d-779b-8bc5-f0f95a66d596" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/StockholdersEquityExercisePriceRangeofOptionsOutstandingandExercisableDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#StockholdersEquityExercisePriceRangeofOptionsOutstandingandExercisableDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/StockholdersEquityExercisePriceRangeofOptionsOutstandingandExercisableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_019cd350-832d-7dea-b3a8-c26bd059be99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_019cd350-832d-7315-9d3f-0b5ece9d6f5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_019cd350-832d-7dea-b3a8-c26bd059be99" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_019cd350-832d-7315-9d3f-0b5ece9d6f5c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_019cd350-832d-71b7-a675-0770f9cb4231" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_019cd350-832d-7315-9d3f-0b5ece9d6f5c" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_019cd350-832d-71b7-a675-0770f9cb4231" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_019cd350-832d-71b7-a675-0770f9cb4231_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_019cd350-832d-71b7-a675-0770f9cb4231" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_019cd350-832d-71b7-a675-0770f9cb4231_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_019cd350-832d-743f-8017-8f848b67945b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_019cd350-832d-71b7-a675-0770f9cb4231" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_019cd350-832d-743f-8017-8f848b67945b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ExercisePriceRange1Member_019cd350-832d-7f1a-a837-51993eac8ef8" xlink:href="hims-20260331.xsd#hims_ExercisePriceRange1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_019cd350-832d-743f-8017-8f848b67945b" xlink:to="loc_hims_ExercisePriceRange1Member_019cd350-832d-7f1a-a837-51993eac8ef8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ExercisePriceRange2Member_019cd350-832d-7b67-a1db-66e2896fdede" xlink:href="hims-20260331.xsd#hims_ExercisePriceRange2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_019cd350-832d-743f-8017-8f848b67945b" xlink:to="loc_hims_ExercisePriceRange2Member_019cd350-832d-7b67-a1db-66e2896fdede" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ExercisePriceRange3Member_019cd350-832d-7768-9317-ee19b6661e52" xlink:href="hims-20260331.xsd#hims_ExercisePriceRange3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_019cd350-832d-743f-8017-8f848b67945b" xlink:to="loc_hims_ExercisePriceRange3Member_019cd350-832d-7768-9317-ee19b6661e52" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ExercisePriceRange4Member_019cd350-832d-7e15-996d-b32233fbe35c" xlink:href="hims-20260331.xsd#hims_ExercisePriceRange4Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_019cd350-832d-743f-8017-8f848b67945b" xlink:to="loc_hims_ExercisePriceRange4Member_019cd350-832d-7e15-996d-b32233fbe35c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ExercisePriceRange5Member_019cd350-832d-7529-a854-f72fe53b9830" xlink:href="hims-20260331.xsd#hims_ExercisePriceRange5Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_019cd350-832d-743f-8017-8f848b67945b" xlink:to="loc_hims_ExercisePriceRange5Member_019cd350-832d-7529-a854-f72fe53b9830" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ExercisePriceRange6Member_019cd350-832d-727b-ab88-f371b5d5eddb" xlink:href="hims-20260331.xsd#hims_ExercisePriceRange6Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_019cd350-832d-743f-8017-8f848b67945b" xlink:to="loc_hims_ExercisePriceRange6Member_019cd350-832d-727b-ab88-f371b5d5eddb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_019cd350-832d-781e-8fa9-f9d22f2ea3c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_019cd350-832d-7dea-b3a8-c26bd059be99" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_019cd350-832d-781e-8fa9-f9d22f2ea3c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_019cd350-832d-7173-9f82-d3795edb99c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_019cd350-832d-7dea-b3a8-c26bd059be99" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_019cd350-832d-7173-9f82-d3795edb99c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedPaymentArrangementOptionExercisePriceRangeSharesOutstandingAbstract_019cd350-832d-7e42-9969-3d95dcc3f159" xlink:href="hims-20260331.xsd#hims_ShareBasedPaymentArrangementOptionExercisePriceRangeSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_019cd350-832d-7dea-b3a8-c26bd059be99" xlink:to="loc_hims_ShareBasedPaymentArrangementOptionExercisePriceRangeSharesOutstandingAbstract_019cd350-832d-7e42-9969-3d95dcc3f159" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions_019cd350-832d-7a8e-a724-feadf11e594e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hims_ShareBasedPaymentArrangementOptionExercisePriceRangeSharesOutstandingAbstract_019cd350-832d-7e42-9969-3d95dcc3f159" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions_019cd350-832d-7a8e-a724-feadf11e594e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2_019cd350-832d-7e2a-b5f6-45a22d855043" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hims_ShareBasedPaymentArrangementOptionExercisePriceRangeSharesOutstandingAbstract_019cd350-832d-7e42-9969-3d95dcc3f159" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2_019cd350-832d-7e2a-b5f6-45a22d855043" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedPaymentArrangementOptionExercisePriceRangeSharesExercisableAbstract_019cd350-832d-7964-a1a1-9316c9a281ad" xlink:href="hims-20260331.xsd#hims_ShareBasedPaymentArrangementOptionExercisePriceRangeSharesExercisableAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_019cd350-832d-7dea-b3a8-c26bd059be99" xlink:to="loc_hims_ShareBasedPaymentArrangementOptionExercisePriceRangeSharesExercisableAbstract_019cd350-832d-7964-a1a1-9316c9a281ad" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions_019cd350-832d-7d32-90cf-feaf0a05beb7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hims_ShareBasedPaymentArrangementOptionExercisePriceRangeSharesExercisableAbstract_019cd350-832d-7964-a1a1-9316c9a281ad" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions_019cd350-832d-7d32-90cf-feaf0a05beb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2_019cd350-832d-787e-a674-b5984de20090" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hims_ShareBasedPaymentArrangementOptionExercisePriceRangeSharesExercisableAbstract_019cd350-832d-7964-a1a1-9316c9a281ad" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2_019cd350-832d-787e-a674-b5984de20090" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/StockholdersEquityRSUsNarrativeDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#StockholdersEquityRSUsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/StockholdersEquityRSUsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7eee-b8ea-bd5b6bd4d11f" 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_019cd350-832d-782d-a7fd-0a9dc2ed0519" 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_019cd350-832d-7eee-b8ea-bd5b6bd4d11f" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-782d-a7fd-0a9dc2ed0519" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019cd350-832d-72a1-981e-eca9098d8a43" 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_019cd350-832d-782d-a7fd-0a9dc2ed0519" xlink:to="loc_us-gaap_AwardTypeAxis_019cd350-832d-72a1-981e-eca9098d8a43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-72a1-981e-eca9098d8a43_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_019cd350-832d-72a1-981e-eca9098d8a43" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-72a1-981e-eca9098d8a43_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-7994-b999-932c0fa273d2" 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_019cd350-832d-72a1-981e-eca9098d8a43" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-7994-b999-932c0fa273d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019cd350-832d-7640-8a48-ea22c653f592" 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_019cd350-832d-7994-b999-932c0fa273d2" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019cd350-832d-7640-8a48-ea22c653f592" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_PerformanceRSUsMember_019cd350-832d-728a-b5e2-ba5445757f74" xlink:href="hims-20260331.xsd#hims_PerformanceRSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-7994-b999-932c0fa273d2" xlink:to="loc_hims_PerformanceRSUsMember_019cd350-832d-728a-b5e2-ba5445757f74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_019cd350-832d-7664-b5f1-085efa3afdfa" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-782d-a7fd-0a9dc2ed0519" xlink:to="loc_srt_TitleOfIndividualAxis_019cd350-832d-7664-b5f1-085efa3afdfa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cd350-832d-7664-b5f1-085efa3afdfa_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_019cd350-832d-7664-b5f1-085efa3afdfa" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cd350-832d-7664-b5f1-085efa3afdfa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cd350-832d-76f9-8a4d-8716f8bc92ad" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_019cd350-832d-7664-b5f1-085efa3afdfa" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cd350-832d-76f9-8a4d-8716f8bc92ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ChiefExecutiveOfficerMember_019cd350-832d-75f1-92c9-855c4ac3b787" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ChiefExecutiveOfficerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cd350-832d-76f9-8a4d-8716f8bc92ad" xlink:to="loc_srt_ChiefExecutiveOfficerMember_019cd350-832d-75f1-92c9-855c4ac3b787" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_019cd350-832d-77a4-a83a-1715eec1e91a" 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_019cd350-832d-782d-a7fd-0a9dc2ed0519" xlink:to="loc_us-gaap_VestingAxis_019cd350-832d-77a4-a83a-1715eec1e91a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_019cd350-832d-77a4-a83a-1715eec1e91a_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_019cd350-832d-77a4-a83a-1715eec1e91a" xlink:to="loc_us-gaap_VestingDomain_019cd350-832d-77a4-a83a-1715eec1e91a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_019cd350-832d-7424-b1cb-a94f895529d7" 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_019cd350-832d-77a4-a83a-1715eec1e91a" xlink:to="loc_us-gaap_VestingDomain_019cd350-832d-7424-b1cb-a94f895529d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_019cd350-832d-7d24-a707-8f22c0b3222d" 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_019cd350-832d-7424-b1cb-a94f895529d7" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_019cd350-832d-7d24-a707-8f22c0b3222d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019cd350-832d-79e9-bdda-4e2991989986" 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_019cd350-832d-782d-a7fd-0a9dc2ed0519" xlink:to="loc_srt_RangeAxis_019cd350-832d-79e9-bdda-4e2991989986" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd350-832d-79e9-bdda-4e2991989986_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_019cd350-832d-79e9-bdda-4e2991989986" xlink:to="loc_srt_RangeMember_019cd350-832d-79e9-bdda-4e2991989986_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd350-832d-7644-939c-d51d6fa4d7da" 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_019cd350-832d-79e9-bdda-4e2991989986" xlink:to="loc_srt_RangeMember_019cd350-832d-7644-939c-d51d6fa4d7da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019cd350-832d-78ab-9d33-b2d51f765e4a" 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_019cd350-832d-7644-939c-d51d6fa4d7da" xlink:to="loc_srt_MaximumMember_019cd350-832d-78ab-9d33-b2d51f765e4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019cd350-832d-76d1-b48d-c777c2ddb0d7" 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_019cd350-832d-7644-939c-d51d6fa4d7da" xlink:to="loc_srt_MinimumMember_019cd350-832d-76d1-b48d-c777c2ddb0d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateAxis_019cd350-832d-70ec-8398-d9f9e9d8cb20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-782d-a7fd-0a9dc2ed0519" xlink:to="loc_us-gaap_AwardDateAxis_019cd350-832d-70ec-8398-d9f9e9d8cb20" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateDomain_019cd350-832d-70ec-8398-d9f9e9d8cb20_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardDateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardDateAxis_019cd350-832d-70ec-8398-d9f9e9d8cb20" xlink:to="loc_us-gaap_AwardDateDomain_019cd350-832d-70ec-8398-d9f9e9d8cb20_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateDomain_019cd350-832d-7823-a125-b6690f57a125" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardDateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardDateAxis_019cd350-832d-70ec-8398-d9f9e9d8cb20" xlink:to="loc_us-gaap_AwardDateDomain_019cd350-832d-7823-a125-b6690f57a125" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_February282024Member_019cd350-832d-71b4-a601-0dc43c1ba2b0" xlink:href="hims-20260331.xsd#hims_February282024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AwardDateDomain_019cd350-832d-7823-a125-b6690f57a125" xlink:to="loc_hims_February282024Member_019cd350-832d-71b4-a601-0dc43c1ba2b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_November2024Member_019d1c7d-1165-7e6b-83a7-21c3301d227e" xlink:href="hims-20260331.xsd#hims_November2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AwardDateDomain_019cd350-832d-7823-a125-b6690f57a125" xlink:to="loc_hims_November2024Member_019d1c7d-1165-7e6b-83a7-21c3301d227e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019cd350-832d-72b3-a302-858fec8db889" 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_019cd350-832d-7eee-b8ea-bd5b6bd4d11f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019cd350-832d-72b3-a302-858fec8db889" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_019cd350-832d-7b46-8bd3-79f257450cd7" 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_019cd350-832d-7eee-b8ea-bd5b6bd4d11f" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_019cd350-832d-7b46-8bd3-79f257450cd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019cd350-832d-77dc-89be-db8906fd39cc" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7eee-b8ea-bd5b6bd4d11f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019cd350-832d-77dc-89be-db8906fd39cc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019cd350-832d-7414-86c5-72aecb887320" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7eee-b8ea-bd5b6bd4d11f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019cd350-832d-7414-86c5-72aecb887320" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_019cd350-832d-760c-9ad6-cb884a86d7d8" 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_019cd350-832d-7eee-b8ea-bd5b6bd4d11f" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_019cd350-832d-760c-9ad6-cb884a86d7d8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019cd350-832d-757b-bf69-2d7ee1a94f33" 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_019cd350-832d-7eee-b8ea-bd5b6bd4d11f" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019cd350-832d-757b-bf69-2d7ee1a94f33" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019cd350-832d-73b4-a91b-acafd44ea47a" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7eee-b8ea-bd5b6bd4d11f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019cd350-832d-73b4-a91b-acafd44ea47a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTargetSharesPercent_019cd350-832d-7eed-98d2-ff93e1947eb2" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTargetSharesPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7eee-b8ea-bd5b6bd4d11f" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTargetSharesPercent_019cd350-832d-7eed-98d2-ff93e1947eb2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsGrantsInPeriodGrantDateFairValue_019cd350-832d-7fba-b7c6-e848e5d1bc62" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsGrantsInPeriodGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7eee-b8ea-bd5b6bd4d11f" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsGrantsInPeriodGrantDateFairValue_019cd350-832d-7fba-b7c6-e848e5d1bc62" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/StockholdersEquityRSUsActivityDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#StockholdersEquityRSUsActivityDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/StockholdersEquityRSUsActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-7692-95af-28dbfae0b4ce" 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_019cd350-832d-7e46-b486-6de0d93a68b9" 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_019cd350-832d-7692-95af-28dbfae0b4ce" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-7e46-b486-6de0d93a68b9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019cd350-832d-7ad3-87e7-fada632d7020" 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_019cd350-832d-7e46-b486-6de0d93a68b9" xlink:to="loc_us-gaap_AwardTypeAxis_019cd350-832d-7ad3-87e7-fada632d7020" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-7ad3-87e7-fada632d7020_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_019cd350-832d-7ad3-87e7-fada632d7020" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-7ad3-87e7-fada632d7020_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-722c-9c37-b4c2fc9314d2" 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_019cd350-832d-7ad3-87e7-fada632d7020" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd350-832d-722c-9c37-b4c2fc9314d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019cd350-832d-7ba5-b7c1-d9012e16182b" 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_019cd350-832d-722c-9c37-b4c2fc9314d2" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019cd350-832d-7ba5-b7c1-d9012e16182b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019cd350-832d-7268-8530-63d15ef2928f" 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_019cd350-832d-7692-95af-28dbfae0b4ce" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019cd350-832d-7268-8530-63d15ef2928f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019cd350-832d-7720-be1f-60b97012cf44" 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_019cd350-832d-7268-8530-63d15ef2928f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019cd350-832d-7720-be1f-60b97012cf44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019cd350-832d-75c1-884b-6b970b148820" 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_019cd350-832d-7268-8530-63d15ef2928f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019cd350-832d-75c1-884b-6b970b148820" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019cd350-832d-7c56-a2d7-0f55275efd36" 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_019cd350-832d-7268-8530-63d15ef2928f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019cd350-832d-7c56-a2d7-0f55275efd36" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresAndExpirationsInPeriod_019cd350-832d-77a3-93ff-eb7acc3ef252" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresAndExpirationsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019cd350-832d-7268-8530-63d15ef2928f" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresAndExpirationsInPeriod_019cd350-832d-77a3-93ff-eb7acc3ef252" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019cd350-832d-7268-a5cf-c5dddee4cd6c" 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_019cd350-832d-7a42-abb3-dcb139e5591e" 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_019cd350-832d-7692-95af-28dbfae0b4ce" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019cd350-832d-7a42-abb3-dcb139e5591e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019cd350-832d-7dd7-ace1-060d85119580" 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_019cd350-832d-7a42-abb3-dcb139e5591e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019cd350-832d-7dd7-ace1-060d85119580" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019cd350-832d-721e-9a19-dedaab9b7de2" 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_019cd350-832d-7a42-abb3-dcb139e5591e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019cd350-832d-721e-9a19-dedaab9b7de2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019cd350-832d-747d-8f50-e4ba32fcc715" 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_019cd350-832d-7a42-abb3-dcb139e5591e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019cd350-832d-747d-8f50-e4ba32fcc715" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresAndExpirationsInPeriodWeightedAverageGrantDateFairValue_019cd350-832d-7730-b1c2-7620fab88cf1" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresAndExpirationsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019cd350-832d-7a42-abb3-dcb139e5591e" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresAndExpirationsInPeriodWeightedAverageGrantDateFairValue_019cd350-832d-7730-b1c2-7620fab88cf1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019cd350-832d-78e6-abd0-b8dcee570b30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/StockholdersEquityWarrantsNarrativeDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#StockholdersEquityWarrantsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/StockholdersEquityWarrantsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-74ad-8113-6cfa243b04c9" 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_019cd350-832d-7b5d-8bee-27a82f1f2922" 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_019cd350-832d-74ad-8113-6cfa243b04c9" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-7b5d-8bee-27a82f1f2922" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusAxis_019cd350-832d-7df9-ad40-56b5c905789d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-7b5d-8bee-27a82f1f2922" xlink:to="loc_us-gaap_GranteeStatusAxis_019cd350-832d-7df9-ad40-56b5c905789d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_019cd350-832d-7df9-ad40-56b5c905789d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GranteeStatusAxis_019cd350-832d-7df9-ad40-56b5c905789d" xlink:to="loc_us-gaap_GranteeStatusDomain_019cd350-832d-7df9-ad40-56b5c905789d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_019cd350-832d-7640-9b06-a0dcdbca9625" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GranteeStatusAxis_019cd350-832d-7df9-ad40-56b5c905789d" xlink:to="loc_us-gaap_GranteeStatusDomain_019cd350-832d-7640-9b06-a0dcdbca9625" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedPaymentArrangementCurrentEmployeeMember_019cd350-832d-7519-ac43-170c41621341" xlink:href="hims-20260331.xsd#hims_ShareBasedPaymentArrangementCurrentEmployeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GranteeStatusDomain_019cd350-832d-7640-9b06-a0dcdbca9625" xlink:to="loc_hims_ShareBasedPaymentArrangementCurrentEmployeeMember_019cd350-832d-7519-ac43-170c41621341" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_019d1d02-329b-7081-8930-f71cdb56839e" 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_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-7b5d-8bee-27a82f1f2922" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_019d1d02-329b-7081-8930-f71cdb56839e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019d1d02-329b-7081-8930-f71cdb56839e_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_019d1d02-329b-7081-8930-f71cdb56839e" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019d1d02-329b-7081-8930-f71cdb56839e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019d1d02-329b-7e5f-a015-f76a9c5f3b23" 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_019d1d02-329b-7081-8930-f71cdb56839e" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019d1d02-329b-7e5f-a015-f76a9c5f3b23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_VendorWarrantsMember_019d1d02-329b-7ac1-b129-5293d26574d4" xlink:href="hims-20260331.xsd#hims_VendorWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_019d1d02-329b-7e5f-a015-f76a9c5f3b23" xlink:to="loc_hims_VendorWarrantsMember_019d1d02-329b-7ac1-b129-5293d26574d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_019cd350-832d-7def-bf7a-eeab96f7b78b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-74ad-8113-6cfa243b04c9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_019cd350-832d-7def-bf7a-eeab96f7b78b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableNumber_019cd350-832d-7b21-b97c-9ed40adf288c" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-74ad-8113-6cfa243b04c9" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableNumber_019cd350-832d-7b21-b97c-9ed40adf288c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableAndOutstandingWeightedAverageExercisePrice_019cd350-832d-760b-9a1a-6b0befb754ba" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableAndOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-74ad-8113-6cfa243b04c9" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableAndOutstandingWeightedAverageExercisePrice_019cd350-832d-760b-9a1a-6b0befb754ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableAndOutstandingWeightedAverageRemainingContractualTerms_019cd350-832d-71e3-aeaf-69119f34ccaa" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableAndOutstandingWeightedAverageRemainingContractualTerms"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-74ad-8113-6cfa243b04c9" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableAndOutstandingWeightedAverageRemainingContractualTerms_019cd350-832d-71e3-aeaf-69119f34ccaa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableAndOutstandingAggregateIntrinsicValue_019cd350-832d-73df-b48a-736576497bf7" xlink:href="hims-20260331.xsd#hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableAndOutstandingAggregateIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-74ad-8113-6cfa243b04c9" xlink:to="loc_hims_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableAndOutstandingAggregateIntrinsicValue_019cd350-832d-73df-b48a-736576497bf7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_019cd350-832d-7d8a-aa9e-aa2e61e47f96" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-74ad-8113-6cfa243b04c9" xlink:to="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_019cd350-832d-7d8a-aa9e-aa2e61e47f96" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/StockholdersEquityStockSubjecttoVestingandEarnoutShareLiabilityDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#StockholdersEquityStockSubjecttoVestingandEarnoutShareLiabilityDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/StockholdersEquityStockSubjecttoVestingandEarnoutShareLiabilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-76bc-a54d-328cc036ff25" 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_019cd350-832d-78f6-92fd-5f12eea9f5ff" 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_019cd350-832d-76bc-a54d-328cc036ff25" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-78f6-92fd-5f12eea9f5ff" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusAxis_019cd350-832d-7a0f-a919-b5b1137e28f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd350-832d-78f6-92fd-5f12eea9f5ff" xlink:to="loc_us-gaap_GranteeStatusAxis_019cd350-832d-7a0f-a919-b5b1137e28f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_019cd350-832d-7a0f-a919-b5b1137e28f0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GranteeStatusAxis_019cd350-832d-7a0f-a919-b5b1137e28f0" xlink:to="loc_us-gaap_GranteeStatusDomain_019cd350-832d-7a0f-a919-b5b1137e28f0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_019cd350-832d-779d-be4e-7ad42554fb10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GranteeStatusAxis_019cd350-832d-7a0f-a919-b5b1137e28f0" xlink:to="loc_us-gaap_GranteeStatusDomain_019cd350-832d-779d-be4e-7ad42554fb10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedPaymentArrangementEmployeeMember_019cd350-832d-7e2d-9138-e8b50f34e276" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedPaymentArrangementEmployeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GranteeStatusDomain_019cd350-832d-779d-be4e-7ad42554fb10" xlink:to="loc_us-gaap_ShareBasedPaymentArrangementEmployeeMember_019cd350-832d-7e2d-9138-e8b50f34e276" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_019cd350-832d-72c9-8b0f-c8ca0194e6a9" 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_019cd350-832d-78f6-92fd-5f12eea9f5ff" xlink:to="loc_us-gaap_VestingAxis_019cd350-832d-72c9-8b0f-c8ca0194e6a9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_019cd350-832d-72c9-8b0f-c8ca0194e6a9_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_019cd350-832d-72c9-8b0f-c8ca0194e6a9" xlink:to="loc_us-gaap_VestingDomain_019cd350-832d-72c9-8b0f-c8ca0194e6a9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_019cd350-832d-7fee-9a01-973fe54ac40d" 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_019cd350-832d-72c9-8b0f-c8ca0194e6a9" xlink:to="loc_us-gaap_VestingDomain_019cd350-832d-7fee-9a01-973fe54ac40d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_019cd350-832d-7546-a862-1e11c702cc14" 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_019cd350-832d-7fee-9a01-973fe54ac40d" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_019cd350-832d-7546-a862-1e11c702cc14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cd350-832d-76ce-9c0e-9a1a58df0144" 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_019cd350-832d-78f6-92fd-5f12eea9f5ff" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cd350-832d-76ce-9c0e-9a1a58df0144" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cd350-832d-76ce-9c0e-9a1a58df0144_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_019cd350-832d-76ce-9c0e-9a1a58df0144" xlink:to="loc_us-gaap_ClassOfStockDomain_019cd350-832d-76ce-9c0e-9a1a58df0144_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cd350-832d-796d-9242-4c21e0693993" 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_019cd350-832d-76ce-9c0e-9a1a58df0144" xlink:to="loc_us-gaap_ClassOfStockDomain_019cd350-832d-796d-9242-4c21e0693993" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019cd350-832d-7969-8efc-e31a0463b5be" 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_019cd350-832d-796d-9242-4c21e0693993" xlink:to="loc_us-gaap_CommonClassAMember_019cd350-832d-7969-8efc-e31a0463b5be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019cd350-832d-7214-8b13-af20e214868c" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd350-832d-76bc-a54d-328cc036ff25" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019cd350-832d-7214-8b13-af20e214868c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019cd350-832d-7dee-804b-f9a96cbb62cd" 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_019cd350-832d-76bc-a54d-328cc036ff25" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019cd350-832d-7dee-804b-f9a96cbb62cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_019cd350-832d-7239-bd46-b3293b982430" 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_019cd350-832d-76bc-a54d-328cc036ff25" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_019cd350-832d-7239-bd46-b3293b982430" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019cd350-832d-7a8d-b36d-ae38acf80705" 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_019cd350-832d-76bc-a54d-328cc036ff25" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019cd350-832d-7a8d-b36d-ae38acf80705" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/StockholdersEquitySummaryofStockBasedCompensationExpenseforEmployeesandNonemployeesDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#StockholdersEquitySummaryofStockBasedCompensationExpenseforEmployeesandNonemployeesDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/StockholdersEquitySummaryofStockBasedCompensationExpenseforEmployeesandNonemployeesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_019cd350-832d-77b9-8233-521a6e748369" 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_019cd350-832d-7155-9065-2cb2b5b48512" 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_019cd350-832d-77b9-8233-521a6e748369" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_019cd350-832d-7155-9065-2cb2b5b48512" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_019cd350-832d-7ddd-8ad2-07f43c2b3bf0" 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_019cd350-832d-7155-9065-2cb2b5b48512" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_019cd350-832d-7ddd-8ad2-07f43c2b3bf0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019cd350-832d-7ddd-8ad2-07f43c2b3bf0_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_019cd350-832d-7ddd-8ad2-07f43c2b3bf0" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019cd350-832d-7ddd-8ad2-07f43c2b3bf0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019cd350-832d-7623-90b7-111e913166b1" 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_019cd350-832d-7ddd-8ad2-07f43c2b3bf0" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019cd350-832d-7623-90b7-111e913166b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_MarketingExpenseMember_019cd350-832d-7d4e-991c-dc51f9ca8919" xlink:href="hims-20260331.xsd#hims_MarketingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019cd350-832d-7623-90b7-111e913166b1" xlink:to="loc_hims_MarketingExpenseMember_019cd350-832d-7d4e-991c-dc51f9ca8919" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_OperationsAndSupportMember_019cd350-832d-78d3-b1f9-d471a3815167" xlink:href="hims-20260331.xsd#hims_OperationsAndSupportMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019cd350-832d-7623-90b7-111e913166b1" xlink:to="loc_hims_OperationsAndSupportMember_019cd350-832d-78d3-b1f9-d471a3815167" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_TechnologyAndDevelopmentMember_019cd350-832d-7a27-bbcc-8439df6c87d7" xlink:href="hims-20260331.xsd#hims_TechnologyAndDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019cd350-832d-7623-90b7-111e913166b1" xlink:to="loc_hims_TechnologyAndDevelopmentMember_019cd350-832d-7a27-bbcc-8439df6c87d7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_019cd350-832d-79bd-8b59-b2374a981941" 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_019cd350-832d-7623-90b7-111e913166b1" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_019cd350-832d-79bd-8b59-b2374a981941" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019cd350-832d-7d29-8b5c-49da8aad2ec1" 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_019cd350-832d-77b9-8233-521a6e748369" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019cd350-832d-7d29-8b5c-49da8aad2ec1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount_019cd350-832d-7eb1-9216-a9b8e341770e" 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_019cd350-832d-77b9-8233-521a6e748369" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount_019cd350-832d-7eb1-9216-a9b8e341770e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/RelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#RelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019cd350-832d-7da9-9ea3-7c1fd9c1abba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019cd350-832d-7f2e-ae6d-3a99e8d4c9e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019cd350-832d-7da9-9ea3-7c1fd9c1abba" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019cd350-832d-7f2e-ae6d-3a99e8d4c9e7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_019cd350-832d-752c-a326-8aefadb9b214" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019cd350-832d-7f2e-ae6d-3a99e8d4c9e7" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_019cd350-832d-752c-a326-8aefadb9b214" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019cd350-832d-752c-a326-8aefadb9b214_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019cd350-832d-752c-a326-8aefadb9b214" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019cd350-832d-752c-a326-8aefadb9b214_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019cd350-832d-7915-be6e-cc2951c8176f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019cd350-832d-752c-a326-8aefadb9b214" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019cd350-832d-7915-be6e-cc2951c8176f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_VouchedMember_019cd350-832d-77d8-8155-fabd81a563e0" xlink:href="hims-20260331.xsd#hims_VouchedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019cd350-832d-7915-be6e-cc2951c8176f" xlink:to="loc_hims_VouchedMember_019cd350-832d-77d8-8155-fabd81a563e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingCostsAndExpenses_019cd350-832d-70fa-85d0-76cbc1a91fd4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingCostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019cd350-832d-7da9-9ea3-7c1fd9c1abba" xlink:to="loc_us-gaap_OperatingCostsAndExpenses_019cd350-832d-70fa-85d0-76cbc1a91fd4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/BasicandDilutedNetLossIncomeperShareAdditionalInformationDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#BasicandDilutedNetLossIncomeperShareAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/BasicandDilutedNetLossIncomeperShareAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019cd350-832d-78b3-9d22-72b04c126ada" 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_019cd350-832d-72db-ad78-91fa54302013" 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_019cd350-832d-78b3-9d22-72b04c126ada" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019cd350-832d-72db-ad78-91fa54302013" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_019cd350-832d-7c87-850c-4cce4aa112cc" 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_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019cd350-832d-72db-ad78-91fa54302013" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_019cd350-832d-7c87-850c-4cce4aa112cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019cd350-832d-7c87-850c-4cce4aa112cc_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_019cd350-832d-7c87-850c-4cce4aa112cc" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019cd350-832d-7c87-850c-4cce4aa112cc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019cd350-832d-7056-aa07-51d400b7b84d" 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_019cd350-832d-7c87-850c-4cce4aa112cc" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019cd350-832d-7056-aa07-51d400b7b84d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_CommonClassVMember_019cd350-832d-7502-afad-e0ffd07daf05" xlink:href="hims-20260331.xsd#hims_CommonClassVMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_019cd350-832d-7056-aa07-51d400b7b84d" xlink:to="loc_hims_CommonClassVMember_019cd350-832d-7502-afad-e0ffd07daf05" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_019cd350-832d-77c5-aee7-58d4f0701c20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019cd350-832d-78b3-9d22-72b04c126ada" xlink:to="loc_us-gaap_DividendsCommonStock_019cd350-832d-77c5-aee7-58d4f0701c20" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019cd350-832d-7aaa-a214-67a1b6263886" 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_019cd350-832d-78b3-9d22-72b04c126ada" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019cd350-832d-7aaa-a214-67a1b6263886" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/BasicandDilutedNetLossIncomeperShareComputationofBasicandDilutedNetLossperShareDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#BasicandDilutedNetLossIncomeperShareComputationofBasicandDilutedNetLossperShareDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/BasicandDilutedNetLossIncomeperShareComputationofBasicandDilutedNetLossperShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicLineItems_019cd350-832d-7163-97ff-476cb9390bf7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasicLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019cd350-832d-7b0a-9ad2-be17d1f6b759" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019cd350-832d-7163-97ff-476cb9390bf7" xlink:to="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019cd350-832d-7b0a-9ad2-be17d1f6b759" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cd350-832d-72d5-9b14-6030c347fa38" 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_ScheduleOfEarningsPerShareBasicByCommonClassTable_019cd350-832d-7b0a-9ad2-be17d1f6b759" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cd350-832d-72d5-9b14-6030c347fa38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cd350-832d-72d5-9b14-6030c347fa38_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_019cd350-832d-72d5-9b14-6030c347fa38" xlink:to="loc_us-gaap_ClassOfStockDomain_019cd350-832d-72d5-9b14-6030c347fa38_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cd350-832d-71a3-85ff-003b4dcb6a66" 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_019cd350-832d-72d5-9b14-6030c347fa38" xlink:to="loc_us-gaap_ClassOfStockDomain_019cd350-832d-71a3-85ff-003b4dcb6a66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019cd350-832d-75a2-bf22-38f112a271fc" 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_019cd350-832d-71a3-85ff-003b4dcb6a66" xlink:to="loc_us-gaap_CommonClassAMember_019cd350-832d-75a2-bf22-38f112a271fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_CommonClassVMember_019cd350-832d-7364-a716-a796bfb767af" xlink:href="hims-20260331.xsd#hims_CommonClassVMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019cd350-832d-71a3-85ff-003b4dcb6a66" xlink:to="loc_hims_CommonClassVMember_019cd350-832d-7364-a716-a796bfb767af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract_019cd350-832d-7a5c-932f-29507a0c94ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019cd350-832d-7163-97ff-476cb9390bf7" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract_019cd350-832d-7a5c-932f-29507a0c94ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019cd350-832d-783c-83a1-8e688fac4010" 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_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract_019cd350-832d-7a5c-932f-29507a0c94ea" xlink:to="loc_us-gaap_NetIncomeLoss_019cd350-832d-783c-83a1-8e688fac4010" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UndistributedEarningsDiluted_019cd350-832d-755a-859e-fe98aeb6e35a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UndistributedEarningsDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract_019cd350-832d-7a5c-932f-29507a0c94ea" xlink:to="loc_us-gaap_UndistributedEarningsDiluted_019cd350-832d-755a-859e-fe98aeb6e35a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019cd350-832d-712f-81d5-311cca75b263" 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_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract_019cd350-832d-7a5c-932f-29507a0c94ea" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019cd350-832d-712f-81d5-311cca75b263" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_019cd350-832d-7388-bbc3-b98987feb3fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019cd350-832d-7163-97ff-476cb9390bf7" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_019cd350-832d-7388-bbc3-b98987feb3fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019cd350-832d-7ae0-96fc-1c1e2046c0cd" 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_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_019cd350-832d-7388-bbc3-b98987feb3fa" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019cd350-832d-7ae0-96fc-1c1e2046c0cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_019cd350-832d-7167-b9d1-965d4069e4de" 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_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_019cd350-832d-7388-bbc3-b98987feb3fa" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_019cd350-832d-7167-b9d1-965d4069e4de" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019cd350-832d-71c6-939d-efd47fe055d5" 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_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_019cd350-832d-7388-bbc3-b98987feb3fa" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019cd350-832d-71c6-939d-efd47fe055d5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_019cd350-832d-73de-b1f9-a28d46480565" 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_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_019cd350-832d-7388-bbc3-b98987feb3fa" xlink:to="loc_us-gaap_EarningsPerShareBasic_019cd350-832d-73de-b1f9-a28d46480565" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_019cd350-832d-7247-b643-486cc58984b3" 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_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_019cd350-832d-7388-bbc3-b98987feb3fa" xlink:to="loc_us-gaap_EarningsPerShareDiluted_019cd350-832d-7247-b643-486cc58984b3" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/BasicandDilutedNetLossIncomeperShareScheduleofExcludedAntidilutiveSecuritiesDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#BasicandDilutedNetLossIncomeperShareScheduleofExcludedAntidilutiveSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/BasicandDilutedNetLossIncomeperShareScheduleofExcludedAntidilutiveSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019cd350-832d-77aa-aa16-b717dc0309ef" 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_019cd350-832d-7a21-96e0-3443ceb2112a" 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_019cd350-832d-77aa-aa16-b717dc0309ef" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019cd350-832d-7a21-96e0-3443ceb2112a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019cd350-832d-79d5-8deb-6c71d22dfc4f" 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_019cd350-832d-7a21-96e0-3443ceb2112a" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019cd350-832d-79d5-8deb-6c71d22dfc4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cd350-832d-79d5-8deb-6c71d22dfc4f_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_019cd350-832d-79d5-8deb-6c71d22dfc4f" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cd350-832d-79d5-8deb-6c71d22dfc4f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cd350-832d-7863-b519-7eee9f014891" 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_019cd350-832d-79d5-8deb-6c71d22dfc4f" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cd350-832d-7863-b519-7eee9f014891" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019cd350-832d-7d02-8e0e-dcdfd70f101e" 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_019cd350-832d-7863-b519-7eee9f014891" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019cd350-832d-7d02-8e0e-dcdfd70f101e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_019cd350-832d-7ce5-abf2-cdde4222bd5a" 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_AntidilutiveSecuritiesNameDomain_019cd350-832d-7863-b519-7eee9f014891" xlink:to="loc_us-gaap_ConvertibleDebtMember_019cd350-832d-7ce5-abf2-cdde4222bd5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_019cd350-832d-7cda-812f-fc33acf1a4e1" 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_019cd350-832d-7863-b519-7eee9f014891" xlink:to="loc_us-gaap_EmployeeStockOptionMember_019cd350-832d-7cda-812f-fc33acf1a4e1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_019e08da-e890-72cd-82c7-07513d04a1f2" 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_019cd350-832d-7863-b519-7eee9f014891" xlink:to="loc_us-gaap_EmployeeStockMember_019e08da-e890-72cd-82c7-07513d04a1f2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_019dd1a6-8254-7ffc-83ea-fbda7967b433" 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_019cd350-832d-7863-b519-7eee9f014891" xlink:to="loc_us-gaap_WarrantMember_019dd1a6-8254-7ffc-83ea-fbda7967b433" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_019cd350-832d-7720-bf00-6500c8650a64" 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_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019cd350-832d-7a21-96e0-3443ceb2112a" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_019cd350-832d-7720-bf00-6500c8650a64" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019cd350-832d-7720-bf00-6500c8650a64_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_019cd350-832d-7720-bf00-6500c8650a64" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019cd350-832d-7720-bf00-6500c8650a64_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019cd350-832d-788b-b2d4-be37bee512a0" 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_019cd350-832d-7720-bf00-6500c8650a64" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019cd350-832d-788b-b2d4-be37bee512a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019cd350-832d-75aa-a45e-d55167cb379a" 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_ClassOfWarrantOrRightDomain_019cd350-832d-788b-b2d4-be37bee512a0" xlink:to="loc_us-gaap_CommonClassAMember_019cd350-832d-75aa-a45e-d55167cb379a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019cd350-832d-73d7-9fb6-d850bae18ef5" 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_019cd350-832d-77aa-aa16-b717dc0309ef" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019cd350-832d-73d7-9fb6-d850bae18ef5" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://forhims.com/role/SegmentsSegmentInformationBySegmentDetails" xlink:type="simple" xlink:href="hims-20260331.xsd#SegmentsSegmentInformationBySegmentDetails"/>
  <link:definitionLink xlink:role="http://forhims.com/role/SegmentsSegmentInformationBySegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019cd350-83f3-71fb-9dab-bba888683684" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd350-832d-73e7-9e66-ceee2bd8ff01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd350-83f3-71fb-9dab-bba888683684" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd350-832d-73e7-9e66-ceee2bd8ff01" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_CompensationTypeAxis_019cd350-832d-76aa-ad68-10bc713105df" xlink:href="hims-20260331.xsd#hims_CompensationTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd350-832d-73e7-9e66-ceee2bd8ff01" xlink:to="loc_hims_CompensationTypeAxis_019cd350-832d-76aa-ad68-10bc713105df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_CompensationTypeDomain_019cd350-832d-76aa-ad68-10bc713105df_default" xlink:href="hims-20260331.xsd#hims_CompensationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hims_CompensationTypeAxis_019cd350-832d-76aa-ad68-10bc713105df" xlink:to="loc_hims_CompensationTypeDomain_019cd350-832d-76aa-ad68-10bc713105df_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_CompensationTypeDomain_019cd350-832d-7f8f-b688-b90e26f883e2" xlink:href="hims-20260331.xsd#hims_CompensationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hims_CompensationTypeAxis_019cd350-832d-76aa-ad68-10bc713105df" xlink:to="loc_hims_CompensationTypeDomain_019cd350-832d-7f8f-b688-b90e26f883e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_EmployeeCompensationMember_019cd350-832d-717e-ba9b-a13155f553bd" xlink:href="hims-20260331.xsd#hims_EmployeeCompensationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hims_CompensationTypeDomain_019cd350-832d-7f8f-b688-b90e26f883e2" xlink:to="loc_hims_EmployeeCompensationMember_019cd350-832d-717e-ba9b-a13155f553bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_StockBasedCompensationMember_019cd350-83f3-7041-8b72-2b1f38cbaec4" xlink:href="hims-20260331.xsd#hims_StockBasedCompensationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hims_CompensationTypeDomain_019cd350-832d-7f8f-b688-b90e26f883e2" xlink:to="loc_hims_StockBasedCompensationMember_019cd350-83f3-7041-8b72-2b1f38cbaec4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019cd350-83f3-778a-8e6a-d8e0e88140f8" 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_SegmentReportingInformationLineItems_019cd350-83f3-71fb-9dab-bba888683684" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019cd350-83f3-778a-8e6a-d8e0e88140f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_019cd350-83f3-7c7d-ac06-008392747a1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd350-83f3-71fb-9dab-bba888683684" xlink:to="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_019cd350-83f3-7c7d-ac06-008392747a1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_019cd350-83f3-7f47-9859-f23a22ee2c53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_019cd350-83f3-7c7d-ac06-008392747a1e" xlink:to="loc_us-gaap_CostOfRevenue_019cd350-83f3-7f47-9859-f23a22ee2c53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_CustomerAcquisitionCosts_019cd350-83f3-7c2f-ab3d-ca5cdf8ae0ab" xlink:href="hims-20260331.xsd#hims_CustomerAcquisitionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_019cd350-83f3-7c7d-ac06-008392747a1e" xlink:to="loc_hims_CustomerAcquisitionCosts_019cd350-83f3-7c2f-ab3d-ca5cdf8ae0ab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_MarketingExpenseAdjusted_019cd350-83f3-7fdb-b105-ed864af9c1a7" xlink:href="hims-20260331.xsd#hims_MarketingExpenseAdjusted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_019cd350-83f3-7c7d-ac06-008392747a1e" xlink:to="loc_hims_MarketingExpenseAdjusted_019cd350-83f3-7fdb-b105-ed864af9c1a7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_OperationsAndSupportExpenseAdjusted_019cd350-83f3-71ce-abb8-0980ab058045" xlink:href="hims-20260331.xsd#hims_OperationsAndSupportExpenseAdjusted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_019cd350-83f3-7c7d-ac06-008392747a1e" xlink:to="loc_hims_OperationsAndSupportExpenseAdjusted_019cd350-83f3-71ce-abb8-0980ab058045" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_TechnologyAndDevelopmentAdjusted_019cd350-83f3-7093-8f18-c1e76c9713ae" xlink:href="hims-20260331.xsd#hims_TechnologyAndDevelopmentAdjusted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_019cd350-83f3-7c7d-ac06-008392747a1e" xlink:to="loc_hims_TechnologyAndDevelopmentAdjusted_019cd350-83f3-7093-8f18-c1e76c9713ae" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_GeneralAndAdministrativeExpenseAdjusted_019cd350-83f3-71ab-a750-9af317b6d5b4" xlink:href="hims-20260331.xsd#hims_GeneralAndAdministrativeExpenseAdjusted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_019cd350-83f3-7c7d-ac06-008392747a1e" xlink:to="loc_hims_GeneralAndAdministrativeExpenseAdjusted_019cd350-83f3-71ab-a750-9af317b6d5b4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_DepreciationDepletionAndAmortizationAdjusted_019cd350-83f3-7690-95d1-615742606acb" xlink:href="hims-20260331.xsd#hims_DepreciationDepletionAndAmortizationAdjusted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd350-83f3-71fb-9dab-bba888683684" xlink:to="loc_hims_DepreciationDepletionAndAmortizationAdjusted_019cd350-83f3-7690-95d1-615742606acb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationSettlementExpense_019df519-a3b8-71ad-879d-720dd612c2a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LitigationSettlementExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd350-83f3-71fb-9dab-bba888683684" xlink:to="loc_us-gaap_LitigationSettlementExpense_019df519-a3b8-71ad-879d-720dd612c2a0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss_019dd1a8-adcb-7026-9ca6-4375c6cbaf0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd350-83f3-71fb-9dab-bba888683684" xlink:to="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss_019dd1a8-adcb-7026-9ca6-4375c6cbaf0a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_IncomeLossFromChangeOfFairValueLiabilities_019dd1a9-683c-7b1b-aee8-608b23e86876" xlink:href="hims-20260331.xsd#hims_IncomeLossFromChangeOfFairValueLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd350-83f3-71fb-9dab-bba888683684" xlink:to="loc_hims_IncomeLossFromChangeOfFairValueLiabilities_019dd1a9-683c-7b1b-aee8-608b23e86876" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_InterestIncomeExpenseNonoperatingAdjustment_019cd350-83f3-76e9-8a18-5277cadff5f3" xlink:href="hims-20260331.xsd#hims_InterestIncomeExpenseNonoperatingAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd350-83f3-71fb-9dab-bba888683684" xlink:to="loc_hims_InterestIncomeExpenseNonoperatingAdjustment_019cd350-83f3-76e9-8a18-5277cadff5f3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019cd350-83f3-7f26-8344-b313b1f9a2a8" 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_SegmentReportingInformationLineItems_019cd350-83f3-71fb-9dab-bba888683684" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019cd350-83f3-7f26-8344-b313b1f9a2a8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_019cd350-83f3-7e42-85c7-68f69576c5de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd350-83f3-71fb-9dab-bba888683684" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_019cd350-83f3-7e42-85c7-68f69576c5de" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019cd350-83f3-7ee7-a949-59ce979a726c" 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_SegmentReportingInformationLineItems_019cd350-83f3-71fb-9dab-bba888683684" xlink:to="loc_us-gaap_NetIncomeLoss_019cd350-83f3-7ee7-a949-59ce979a726c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_hims_AdjustmentsAndReconcilingItems_019cd350-83f3-752f-aad8-b937b5df6522" xlink:href="hims-20260331.xsd#hims_AdjustmentsAndReconcilingItems"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd350-83f3-71fb-9dab-bba888683684" xlink:to="loc_hims_AdjustmentsAndReconcilingItems_019cd350-83f3-752f-aad8-b937b5df6522" xlink:type="arc" order="10"/>
  </link:definitionLink>
</link:linkbase>
