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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:9044f9da-8a9d-494b-87ec-7190799201e5,g:b5c77cd5-e065-4936-b034-98de411d32d7-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.oildri.com/role/CoverPageDocument" xlink:type="simple" xlink:href="odc-20211207.xsd#CoverPageDocument"/>
  <link:definitionLink xlink:role="http://www.oildri.com/role/CoverPageDocument" xlink:type="extended" id="i5daddd04511e4c85aaeea743c0eab777_CoverPageDocument">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_e7e3e8b1-762c-46ba-bbf1-68f9a3d7361e" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_DocumentType_e7e3e8b1-762c-46ba-bbf1-68f9a3d7361e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_e2b5d740-eebf-4f43-b70c-9133049d054e" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_EntityRegistrantName_e2b5d740-eebf-4f43-b70c-9133049d054e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_e95d4cd5-8fa8-47b8-bd03-9a942cbf5be5" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_EntityIncorporationStateCountryCode_e95d4cd5-8fa8-47b8-bd03-9a942cbf5be5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_85244613-32bf-4a83-bb0f-e578b3e1bc90" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_EntityFileNumber_85244613-32bf-4a83-bb0f-e578b3e1bc90" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_563fd7ae-7f44-45ba-bf7d-1c7ca34082ef" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_EntityTaxIdentificationNumber_563fd7ae-7f44-45ba-bf7d-1c7ca34082ef" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_86403410-d6a6-4511-bb38-3399cae8f6bc" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_EntityAddressAddressLine1_86403410-d6a6-4511-bb38-3399cae8f6bc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_b919816f-44a2-4b6a-a1a5-973ba986b13e" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_EntityAddressAddressLine2_b919816f-44a2-4b6a-a1a5-973ba986b13e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_c1f3e07a-29ad-439a-9324-34fe735bf0e1" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_EntityAddressCityOrTown_c1f3e07a-29ad-439a-9324-34fe735bf0e1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_1b81a766-caf8-45ea-a95b-0cfe2fcdc585" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_EntityAddressStateOrProvince_1b81a766-caf8-45ea-a95b-0cfe2fcdc585" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_b458ba5b-a41d-4d99-b9c9-585b6bb17b22" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_EntityAddressPostalZipCode_b458ba5b-a41d-4d99-b9c9-585b6bb17b22" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_ce51da74-121b-4ae2-a3eb-19c531f8e12d" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_CityAreaCode_ce51da74-121b-4ae2-a3eb-19c531f8e12d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_0df5c054-7d99-4c99-8f56-763f350ea8a5" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_LocalPhoneNumber_0df5c054-7d99-4c99-8f56-763f350ea8a5" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_05f5ea2e-70bb-49ee-a9d2-72a2aba19c17" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_Security12bTitle_05f5ea2e-70bb-49ee-a9d2-72a2aba19c17" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_ccd035e9-8ea4-4e44-901d-bc60f8ffd325" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_TradingSymbol_ccd035e9-8ea4-4e44-901d-bc60f8ffd325" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_eb246841-09f9-4d98-9982-27e94a43c720" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_SecurityExchangeName_eb246841-09f9-4d98-9982-27e94a43c720" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_af194d66-e1f8-48aa-8aec-61ac3ebc84d2" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_WrittenCommunications_af194d66-e1f8-48aa-8aec-61ac3ebc84d2" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_1d8b7734-3466-4728-b625-e0e0f86f558c" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_SolicitingMaterial_1d8b7734-3466-4728-b625-e0e0f86f558c" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_6f4ed49c-d928-4af3-a6fb-8d3bab3df7c3" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_PreCommencementTenderOffer_6f4ed49c-d928-4af3-a6fb-8d3bab3df7c3" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_87387bce-64a8-494e-8779-9273c835783d" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_87387bce-64a8-494e-8779-9273c835783d" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_557a316e-1b4a-4897-9784-e9585c40ee5c" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_EntityEmergingGrowthCompany_557a316e-1b4a-4897-9784-e9585c40ee5c" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_6d2aa361-045f-4709-8efb-a006dd241fbf" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_EntityCentralIndexKey_6d2aa361-045f-4709-8efb-a006dd241fbf" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_5abae7d0-6b94-4100-b33f-b8f742f06eb8" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_AmendmentFlag_5abae7d0-6b94-4100-b33f-b8f742f06eb8" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_1763d720-d2ac-440a-81f3-3e8e1249e6b2" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_DocumentPeriodEndDate_1763d720-d2ac-440a-81f3-3e8e1249e6b2" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_bd7b2b97-b1ba-4235-bebf-eb0c1f3322cd" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_803efd5d-3b00-4406-84a3-36645382b3f6" xlink:to="loc_dei_EntitiesTable_bd7b2b97-b1ba-4235-bebf-eb0c1f3322cd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_3e416a6f-6e53-455b-8414-ab12f4eda178" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_bd7b2b97-b1ba-4235-bebf-eb0c1f3322cd" xlink:to="loc_dei_LegalEntityAxis_3e416a6f-6e53-455b-8414-ab12f4eda178" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_3e416a6f-6e53-455b-8414-ab12f4eda178_default" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_3e416a6f-6e53-455b-8414-ab12f4eda178" xlink:to="loc_dei_EntityDomain_3e416a6f-6e53-455b-8414-ab12f4eda178_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_87c9c923-a56c-4908-a6a8-cfb8df9131ec" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_3e416a6f-6e53-455b-8414-ab12f4eda178" xlink:to="loc_dei_EntityDomain_87c9c923-a56c-4908-a6a8-cfb8df9131ec" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
