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    <submissionType>NPORT-P</submissionType>
    <isConfidential>false</isConfidential>
    <filerInfo>
      
      <filer>
        <issuerCredentials>
          <cik>0000355437</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
      </filer>
      
      
      <seriesClassInfo>
        <seriesId>S000066958</seriesId>
        <classId>C000215528</classId>
      </seriesClassInfo>
      
      
    </filerInfo>
  </headerData>
  <formData>
    <genInfo>
      <regName>DFA INVESTMENT DIMENSIONS GROUP INC</regName>
      <regFileNumber>811-03258</regFileNumber>
      <regCik>0000355437</regCik>
      <regLei>549300XGRTBJCE41BD26</regLei>
      <regStreet1>6300 BEE CAVE ROAD</regStreet1>
      <regStreet2>BUILDING ONE</regStreet2>
      <regCity>AUSTIN</regCity>
      <regStateConditional regCountry="US" regState="US-TX"/>
      <regZipOrPostalCode>78746</regZipOrPostalCode>
      <regPhone>512-306-7400</regPhone>
      <seriesName>Global Social Core Equity Portfolio</seriesName>
      <seriesId>S000066958</seriesId>
      <seriesLei>5493008ZOHBZZSFU7Z17</seriesLei>
      <repPdEnd>2026-10-31</repPdEnd>
      <repPdDate>2026-04-30</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
    <fundInfo>
      <totAssets>98684749.50</totAssets>
      <totLiabs>4491.99</totLiabs>
      <netAssets>98680257.51</netAssets>
      <assetsAttrMiscSec>0.00000000</assetsAttrMiscSec>
      <assetsInvested>0.00000000</assetsInvested>
      <amtPayOneYrBanksBorr>0.00000000</amtPayOneYrBanksBorr>
      <amtPayOneYrCtrldComp>0.00000000</amtPayOneYrCtrldComp>
      <amtPayOneYrOthAffil>0.00000000</amtPayOneYrOthAffil>
      <amtPayOneYrOther>0.00000000</amtPayOneYrOther>
      <amtPayAftOneYrBanksBorr>0.00000000</amtPayAftOneYrBanksBorr>
      <amtPayAftOneYrCtrldComp>0.00000000</amtPayAftOneYrCtrldComp>
      <amtPayAftOneYrOthAffil>0.00000000</amtPayAftOneYrOthAffil>
      <amtPayAftOneYrOther>0.00000000</amtPayAftOneYrOther>
      <delayDeliv>0.00000000</delayDeliv>
      <standByCommit>0.00000000</standByCommit>
      <liquidPref>0.00000000</liquidPref>
      <cshNotRptdInCorD>21.19000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
          <monthlyTotReturn classId="C000215528" rtn1="2.03000000" rtn2="-6.84000000" rtn3="10.24000000"/>
        </monthlyTotReturns>
        <monthlyReturnCats>
          <equityContracts>
            <mon1 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
            <mon2 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
            <mon3 netRealizedGain="1377.98000000" netUnrealizedAppr="0.00000000"/>
            <futureCategory>
              <instrMon1 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
              <instrMon2 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
              <instrMon3 netRealizedGain="1377.98000000" netUnrealizedAppr="0.00000000"/>
            </futureCategory>
          </equityContracts>
        </monthlyReturnCats>
        <othMon1 netRealizedGain="6611.91000000" netUnrealizedAppr="1844633.94000000"/>
        <othMon2 netRealizedGain="-47222.17000000" netUnrealizedAppr="-6709951.11000000"/>
        <othMon3 netRealizedGain="21679.39000000" netUnrealizedAppr="9192760.87000000"/>
      </returnInfo>
      <mon1Flow redemption="355588.87000000" reinvestment="0.00000000" sales="4904106.53000000"/>
      <mon2Flow redemption="671774.46000000" reinvestment="139131.78000000" sales="568595.32000000"/>
      <mon3Flow redemption="1353148.11000000" reinvestment="0.00000000" sales="1833226.20000000"/>
      
      
    </fundInfo>
    <invstOrSecs>
      <invstOrSec>
        <name>DFA Emerging Markets Social Core Equity Portfolio</name>
        <lei>549300FJQY5TSIXJD844</lei>
        <title>Emerging Markets Social Core Equity Portfolio</title>
        <cusip>233203363</cusip>
        <identifiers>
          <isin value="US2332033636"/>
        </identifiers>
        <balance>594855.68000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>12652580.27000000</valUSD>
        <pctVal>12.82179494588</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>
        
        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>DFA International Social Core Equity Portfolio</name>
        <lei>549300T6IEPA60KWYM55</lei>
        <title>International Social Core Equity Portfolio</title>
        <cusip>25239Y626</cusip>
        <identifiers>
          <isin value="US25239Y6260"/>
        </identifiers>
        <balance>1225013.84000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>25284285.70000000</valUSD>
        <pctVal>25.62243587319</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>
        
        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>State Street Global Advisors</name>
        <lei>549300BZ5TGIFZUZDZ37</lei>
        <title>State Street Institutional U.S. Government Money Market Fund</title>
        <cusip>857492706</cusip>
        <identifiers>
          <isin value="US8574927062"/>
        </identifiers>
        <balance>44342.06000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>44342.06000000</valUSD>
        <pctVal>0.044935087441</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>STIV</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>
        
        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>DFA US Social Core Equity 2 Portfolio</name>
        <lei>5493000O2UT3VQL92M59</lei>
        <title>U.S. Social Core Equity 2 Portfolio</title>
        <cusip>233203298</cusip>
        <identifiers>
          <isin value="US2332032984"/>
        </identifiers>
        <balance>1714442.18000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>60691253.24000000</valUSD>
        <pctVal>61.50293358714</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>
        
        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <explntrNotes>
      <explntrNote note="Monthly returns presented in Item B.5(a) have been calculated without deducting any applicable sales loads or redemption fees." noteItem="B.5.a"/>
    </explntrNotes>
    <signature>
      <ncom:dateSigned>2026-05-19</ncom:dateSigned>
      <ncom:nameOfApplicant>DFA INVESTMENT DIMENSIONS GROUP INC</ncom:nameOfApplicant>
      <ncom:signature>Randy Olson</ncom:signature>
      <ncom:signerName>Randy Olson</ncom:signerName>
      <ncom:title>Vice President</ncom:title>
    </signature>
  </formData>
</edgarSubmission>
