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    <submissionType>NPORT-P</submissionType>
    <isConfidential>false</isConfidential>
    <filerInfo>

      <filer>
        <issuerCredentials>
          <cik>0000355437</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
      </filer>


      <seriesClassInfo>
        <seriesId>S000055975</seriesId>
        <classId>C000176269</classId>
      </seriesClassInfo>


    </filerInfo>
  </headerData>
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      <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 Small Company Portfolio</seriesName>
      <seriesId>S000055975</seriesId>
      <seriesLei>549300LV5BCK35AQXF59</seriesLei>
      <repPdEnd>2026-10-31</repPdEnd>
      <repPdDate>2026-01-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
    <fundInfo>
      <totAssets>138958403.12</totAssets>
      <totLiabs>47069.73</totLiabs>
      <netAssets>138911333.39</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>84713.76000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
          <monthlyTotReturn classId="C000176269" rtn1="2.14000000" rtn2="0.84000000" rtn3="5.53000000"/>
        </monthlyTotReturns>
        <monthlyReturnCats>
          <equityContracts>
            <mon1 netRealizedGain="-33326.12000000" netUnrealizedAppr="0.00000000"/>
            <mon2 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
            <mon3 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
            <futureCategory>
              <instrMon1 netRealizedGain="-33326.12000000" netUnrealizedAppr="0.00000000"/>
              <instrMon2 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
              <instrMon3 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
            </futureCategory>
          </equityContracts>
        </monthlyReturnCats>
        <othMon1 netRealizedGain="-4233.37000000" netUnrealizedAppr="2432175.07000000"/>
        <othMon2 netRealizedGain="431059.40000000" netUnrealizedAppr="-560585.57000000"/>
        <othMon3 netRealizedGain="20337.18000000" netUnrealizedAppr="4103545.51000000"/>
      </returnInfo>
      <mon1Flow redemption="1149641.11000000" reinvestment="0.00000000" sales="16274771.23000000"/>
      <mon2Flow redemption="5884856.50000000" reinvestment="2009337.83000000" sales="949524.24000000"/>
      <mon3Flow redemption="1115091.11000000" reinvestment="0.00000000" sales="9887680.63000000"/>


    </fundInfo>
    <invstOrSecs>
      <invstOrSec>
        <name>DFA US Small Cap Portfolio</name>
        <lei>54930002ZNZ4W0THTP70</lei>
        <title>U.S. Small Cap Portfolio</title>
        <cusip>233203843</cusip>
        <identifiers>
          <isin value="US2332038437"/>
        </identifiers>
        <balance>1550611.41000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>85469701.08000000</valUSD>
        <pctVal>61.52824178862</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>Dimensional Fund Advisors</name>
        <lei>54930006OMTUF18TBS36</lei>
        <title>THE CANADIAN SMALL COMPANY SERIES</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="DFAE_MASTER"/>
        </identifiers>
        <balance>154154.75000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>5173433.37000000</valUSD>
        <pctVal>3.724270182818</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>N/A</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Dimensional Fund Advisors</name>
        <lei>549300TTGDINCXXSVF04</lei>
        <title>THE CONTINENTAL SMALL COMPANY SERIES</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="DFAF_MASTER"/>
        </identifiers>
        <balance>83268.07000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>15268033.12000000</valUSD>
        <pctVal>10.99120766275</pctVal>
        <payoffProfile>Long</payoffProfile>
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        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>N/A</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Dimensional Fund Advisors</name>
        <lei>549300CBGM4U9R4DEL16</lei>
        <title>THE ASIA PACIFIC SMALL COMPANY SERIES</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="DFAH_MASTER"/>
        </identifiers>
        <balance>50458.05000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3706648.36000000</valUSD>
        <pctVal>2.668355611844</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>N/A</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Dimensional Fund Advisors</name>
        <lei>549300FCYEDRJO2L0O02</lei>
        <title>THE UNITED KINGDOM SMALL COMPANY SERIES</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="DFAI_MASTER"/>
        </identifiers>
        <balance>37426.22000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>4190613.54000000</valUSD>
        <pctVal>3.016754240083</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>N/A</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Dimensional Fund Advisors</name>
        <lei>549300XCLYJKZX2XQ177</lei>
        <title>THE JAPANESE SMALL COMPANY SERIES</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="DFAJ_MASTER"/>
        </identifiers>
        <balance>249749.84000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>7899587.46000000</valUSD>
        <pctVal>5.686783984587</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>N/A</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Dimensional Fund Advisors</name>
        <lei>5493003AI5702G3MYM49</lei>
        <title>THE EMERGING MARKETS SMALL CAP SERIES</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="DFAL_MASTER"/>
        </identifiers>
        <balance>132261.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>17123832.29000000</valUSD>
        <pctVal>12.32716717355</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>N/A</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>2026-02-26</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>
  <documents>XXXX</documents>
</edgarSubmission>
