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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019faf1a-327b-71ca-92cd-7acedb69fdcd,g:f343c239-95c9-476f-a8b2-a9beba5fdc63-->
<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.imax.com/role/Cover" xlink:type="simple" xlink:href="imax-20261105.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.imax.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019faf1a-327b-7132-b748-579ce5621c4f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_DocumentInformationTable_019faf1a-327b-7132-b748-579ce5621c4f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressesAddressTypeAxis_019faf1a-327b-7840-b4f7-090b5e65a3a4" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressesAddressTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019faf1a-327b-7132-b748-579ce5621c4f" xlink:to="loc_dei_EntityAddressesAddressTypeAxis_019faf1a-327b-7840-b4f7-090b5e65a3a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain_019faf1a-327b-7840-b4f7-090b5e65a3a4_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AddressTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_019faf1a-327b-7840-b4f7-090b5e65a3a4" xlink:to="loc_dei_AddressTypeDomain_019faf1a-327b-7840-b4f7-090b5e65a3a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain_019faf1a-327b-7d8d-a261-3ba61e9a1297" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AddressTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_019faf1a-327b-7840-b4f7-090b5e65a3a4" xlink:to="loc_dei_AddressTypeDomain_019faf1a-327b-7d8d-a261-3ba61e9a1297" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_OtherAddressMember_019faf1a-327b-7139-af44-a31afd102549" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_OtherAddressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_AddressTypeDomain_019faf1a-327b-7d8d-a261-3ba61e9a1297" xlink:to="loc_dei_OtherAddressMember_019faf1a-327b-7139-af44-a31afd102549" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019faf1a-327b-7017-a03a-ccbe86b53382" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_DocumentType_019faf1a-327b-7017-a03a-ccbe86b53382" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019faf1a-327b-7a8a-b49c-722007752f8b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_DocumentPeriodEndDate_019faf1a-327b-7a8a-b49c-722007752f8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019faf1a-327b-7b6b-96d8-4dd7c116114e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_EntityRegistrantName_019faf1a-327b-7b6b-96d8-4dd7c116114e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019faf1a-327b-7f67-afec-03e2a4435eda" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019faf1a-327b-7f67-afec-03e2a4435eda" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019faf1a-327b-7647-bca8-3ed12641a51a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_EntityFileNumber_019faf1a-327b-7647-bca8-3ed12641a51a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019faf1a-327b-7fd0-8893-a0130817ba2d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_EntityTaxIdentificationNumber_019faf1a-327b-7fd0-8893-a0130817ba2d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019faf1a-327b-7795-98d6-16fcdab69bbe" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_EntityAddressAddressLine1_019faf1a-327b-7795-98d6-16fcdab69bbe" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_019faf1a-327b-7b46-8cc2-c7dc297e0d00" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_EntityAddressAddressLine2_019faf1a-327b-7b46-8cc2-c7dc297e0d00" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019faf1a-327b-749b-9f7f-2e640455957b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_EntityAddressCityOrTown_019faf1a-327b-749b-9f7f-2e640455957b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019faf1a-327b-74db-bd45-a1011aed1568" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_EntityAddressStateOrProvince_019faf1a-327b-74db-bd45-a1011aed1568" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCountry_019faf1a-327b-7051-a261-cbf2ef647404" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCountry"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_EntityAddressCountry_019faf1a-327b-7051-a261-cbf2ef647404" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019faf1a-327b-7078-8cc5-7bc754588e62" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_EntityAddressPostalZipCode_019faf1a-327b-7078-8cc5-7bc754588e62" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019faf1a-327b-73aa-9960-1d6aabe65ab1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_CityAreaCode_019faf1a-327b-73aa-9960-1d6aabe65ab1" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019faf1a-327b-704a-a6f9-73f0c0c3d111" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_LocalPhoneNumber_019faf1a-327b-704a-a6f9-73f0c0c3d111" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019faf1a-327b-78c7-a468-9b4c7bb3f139" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_WrittenCommunications_019faf1a-327b-78c7-a468-9b4c7bb3f139" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019faf1a-327b-7c73-b4c3-bec1713bae3d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_SolicitingMaterial_019faf1a-327b-7c73-b4c3-bec1713bae3d" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019faf1a-327b-7d97-9389-2327113c4fd4" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_PreCommencementTenderOffer_019faf1a-327b-7d97-9389-2327113c4fd4" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019faf1a-327b-732f-9bf4-b89aa265a7b6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019faf1a-327b-732f-9bf4-b89aa265a7b6" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019faf1a-327b-7c65-8611-62509f298f56" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_Security12bTitle_019faf1a-327b-7c65-8611-62509f298f56" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019faf1a-327b-779b-bdc8-337fa324cf53" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_TradingSymbol_019faf1a-327b-779b-bdc8-337fa324cf53" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019faf1a-327b-7c0c-b2aa-7badaa611216" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_SecurityExchangeName_019faf1a-327b-7c0c-b2aa-7badaa611216" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019faf1a-327b-7d45-9964-98c5fabcd26f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_EntityEmergingGrowthCompany_019faf1a-327b-7d45-9964-98c5fabcd26f" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019faf1a-327b-715d-b3ce-1d91dcf2b8bd" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_EntityCentralIndexKey_019faf1a-327b-715d-b3ce-1d91dcf2b8bd" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019faf1a-327b-755e-ab62-90b9df8c377a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019faf1a-327b-77fe-b1bb-e73b2b698bfa" xlink:to="loc_dei_AmendmentFlag_019faf1a-327b-755e-ab62-90b9df8c377a" xlink:type="arc" order="23"/>
  </link:definitionLink>
</link:linkbase>
