<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/nport" xmlns:com="http://www.sec.gov/edgar/common" xmlns:ncom="http://www.sec.gov/edgar/nportcommon" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sec.gov/edgar/nport eis_NPORT_Filer.xsd">
  <headerData>
    <submissionType>NPORT-P</submissionType>
    <isConfidential>false</isConfidential>
    <filerInfo>

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


      <seriesClassInfo>
        <seriesId>S000029683</seriesId>
        <classId>C000091238</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>World ex U.S. Value Portfolio</seriesName>
      <seriesId>S000029683</seriesId>
      <seriesLei>549300YGDVH7UPN8YP11</seriesLei>
      <repPdEnd>2026-10-31</repPdEnd>
      <repPdDate>2026-01-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
    <fundInfo>
      <totAssets>536201501.02</totAssets>
      <totLiabs>67551.94</totLiabs>
      <netAssets>536133949.08</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>570410.57000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
          <monthlyTotReturn classId="C000091238" rtn1="2.05000000" rtn2="3.63000000" rtn3="6.60000000"/>
        </monthlyTotReturns>
        <monthlyReturnCats>
          <equityContracts>
            <mon1 netRealizedGain="0.00000000" netUnrealizedAppr="25484.54000000"/>
            <mon2 netRealizedGain="26444.08000000" netUnrealizedAppr="-25484.54000000"/>
            <mon3 netRealizedGain="-25601.16000000" netUnrealizedAppr="0.00000000"/>
            <futureCategory>
              <instrMon1 netRealizedGain="0.00000000" netUnrealizedAppr="25484.54000000"/>
              <instrMon2 netRealizedGain="26444.08000000" netUnrealizedAppr="-25484.54000000"/>
              <instrMon3 netRealizedGain="-25601.16000000" netUnrealizedAppr="0.00000000"/>
            </futureCategory>
          </equityContracts>
        </monthlyReturnCats>
        <othMon1 netRealizedGain="-3418.17000000" netUnrealizedAppr="1507072.09000000"/>
        <othMon2 netRealizedGain="-11322.89000000" netUnrealizedAppr="-370466.98000000"/>
        <othMon3 netRealizedGain="59001.08000000" netUnrealizedAppr="2727537.57000000"/>
      </returnInfo>
      <mon1Flow redemption="3795724.29000000" reinvestment="0.00000000" sales="66551777.74000000"/>
      <mon2Flow redemption="22326013.22000000" reinvestment="7193076.61000000" sales="11344206.74000000"/>
      <mon3Flow redemption="6516413.58000000" reinvestment="0.00000000" sales="37733231.55000000"/>


    </fundInfo>
    <invstOrSecs>
      <invstOrSec>
        <name>DFA International Small Cap Value Portfolio</name>
        <lei>5493006TUU88J5MAL716</lei>
        <title>DFA International Small Cap Value Portfolio</title>
        <cusip>233203736</cusip>
        <identifiers>
          <isin value="US2332037363"/>
        </identifiers>
        <balance>1439670.18000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>47609892.75000000</valUSD>
        <pctVal>8.880223464993</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>549300WMT0JQLD3UPL78</lei>
        <title>DIMENSIONAL EMERGING MARKETS VALUE FUND INC</title>
        <cusip>254339104</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="DFAM_MASTER"/>
        </identifiers>
        <balance>1493053.39000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>180017447.74000000</valUSD>
        <pctVal>33.57695367900</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>549300MQXJH7N9VTDE15</lei>
        <title>THE DFA INTERNATIONAL VALUE SERIES</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="DFAN_MASTER"/>
        </identifiers>
        <balance>5716322.96000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>307995481.04000000</valUSD>
        <pctVal>57.44748706335</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>
