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    <isConfidential>false</isConfidential>
    <filerInfo>

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


      <seriesClassInfo>
        <seriesId>S000050940</seriesId>
        <classId>C000160540</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>DIMENSIONAL 2040 TARGET DATE RETIREMENT INCOME FUND</seriesName>
      <seriesId>S000050940</seriesId>
      <seriesLei>549300OQ5N615BTPKO93</seriesLei>
      <repPdEnd>2026-10-31</repPdEnd>
      <repPdDate>2026-01-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
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      <totLiabs>59510.64</totLiabs>
      <netAssets>199837952.60</netAssets>
      <assetsAttrMiscSec>0.00000000</assetsAttrMiscSec>
      <assetsInvested>0.00000000</assetsInvested>
      <amtPayOneYrBanksBorr>48600.00000000</amtPayOneYrBanksBorr>
      <amtPayOneYrCtrldComp>0.00000000</amtPayOneYrCtrldComp>
      <amtPayOneYrOthAffil>0.00000000</amtPayOneYrOthAffil>
      <amtPayOneYrOther>0.00000000</amtPayOneYrOther>
      <amtPayAftOneYrBanksBorr>0.00000000</amtPayAftOneYrBanksBorr>
      <amtPayAftOneYrCtrldComp>0.00000000</amtPayAftOneYrCtrldComp>
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      <amtPayAftOneYrOther>0.00000000</amtPayAftOneYrOther>
      <delayDeliv>0.00000000</delayDeliv>
      <standByCommit>0.00000000</standByCommit>
      <liquidPref>0.00000000</liquidPref>
      <cshNotRptdInCorD>58.46000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
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        <othMon2 netRealizedGain="2088197.78000000" netUnrealizedAppr="-3936516.30000000"/>
        <othMon3 netRealizedGain="1155935.35000000" netUnrealizedAppr="2546237.03000000"/>
      </returnInfo>
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      <mon2Flow redemption="14904659.50000000" reinvestment="6177516.58000000" sales="2987319.03000000"/>
      <mon3Flow redemption="5171393.23000000" reinvestment="0.00000000" sales="3201641.68000000"/>


    </fundInfo>
    <invstOrSecs>
      <invstOrSec>
        <name>International Core Equity 2 Portfolio</name>
        <lei>5493006PNAH8EX4MI695</lei>
        <title>International Core Equity 2 Portfolio</title>
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        <identifiers>
          <isin value="US2332033719"/>
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        <balance>391240.68000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
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        <payoffProfile>Long</payoffProfile>
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        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>DFA US Core Equity 1 Portfolio</name>
        <lei>549300HFCYX77UDJN369</lei>
        <title>U.S. Core Equity 1 Portfolio</title>
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        <identifiers>
          <isin value="US2332034139"/>
        </identifiers>
        <balance>868833.62000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>44188878.01000000</valUSD>
        <pctVal>22.11235525338</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>Emerging Markets Core Equity 2 Portfolio</name>
        <lei>549300JF8HO6EL9ROR31</lei>
        <title>Emerging Markets Core Equity 2 Portfolio</title>
        <cusip>233203421</cusip>
        <identifiers>
          <isin value="US2332034212"/>
        </identifiers>
        <balance>380573.72000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>11908151.60000000</valUSD>
        <pctVal>5.958903924439</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 Two-Year Global Fixed Income Portfolio</name>
        <lei>549300PFM0BC0V0V1O39</lei>
        <title>DFA Two-Year Global Fixed Income Portfolio</title>
        <cusip>233203645</cusip>
        <identifiers>
          <isin value="US2332036456"/>
        </identifiers>
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        <valUSD>14852583.87000000</valUSD>
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        <payoffProfile>Long</payoffProfile>
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        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>DFA Large Cap International Portfolio</name>
        <lei>549300YQLH5F7D7ZFY39</lei>
        <title>Large Cap International Portfolio</title>
        <cusip>233203868</cusip>
        <identifiers>
          <isin value="US2332038684"/>
        </identifiers>
        <balance>460133.34000000</balance>
        <units>NS</units>
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        <valUSD>16716644.31000000</valUSD>
        <pctVal>8.365099868422</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 Short-Term Extended Quality Portfolio</name>
        <lei>549300UKO8H5DQFJFW90</lei>
        <title>DFA Short-Term Extended Quality Portfolio</title>
        <cusip>23320G521</cusip>
        <identifiers>
          <isin value="US23320G5210"/>
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        <balance>1416911.59000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>14849233.43000000</valUSD>
        <pctVal>7.430637292267</pctVal>
        <payoffProfile>Long</payoffProfile>
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        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>DFA LTIP Portfolio</name>
        <lei>5493002LL7DG39YNJG30</lei>
        <title>DFA LTIP Portfolio</title>
        <cusip>25239Y873</cusip>
        <identifiers>
          <isin value="US25239Y8738"/>
        </identifiers>
        <balance>8770873.51000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>44906872.35000000</valUSD>
        <pctVal>22.47164353204</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 US Large Company Portfolio</name>
        <lei>549300FK54SMFUX28R78</lei>
        <title>U.S. Large Company Portfolio</title>
        <cusip>25434D823</cusip>
        <identifiers>
          <isin value="US25434D8231"/>
        </identifiers>
        <balance>957571.63000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>44105749.09000000</valUSD>
        <pctVal>22.07075708901</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>2026-02-26</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>
