<?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>0000861929</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
      </filer>


      <seriesClassInfo>
        <seriesId>S000001017</seriesId>
        <classId>C000002770</classId>
        <classId>C000002769</classId>
      </seriesClassInfo>


    </filerInfo>
  </headerData>
  <formData>
    <genInfo>
      <regName>DIMENSIONAL INVESTMENT GROUP INC</regName>
      <regFileNumber>811-06067</regFileNumber>
      <regCik>0000861929</regCik>
      <regLei>549300HU43AV2FC6L876</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 ALLOCATION 60/40 PORTFOLIO</seriesName>
      <seriesId>S000001017</seriesId>
      <seriesLei>549300HLXHMDBVF4DR20</seriesLei>
      <repPdEnd>2020-10-31</repPdEnd>
      <repPdDate>2020-07-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
    <fundInfo>
      <totAssets>3939278725.20</totAssets>
      <totLiabs>2525419.62</totLiabs>
      <netAssets>3936753305.58</netAssets>
      <assetsAttrMiscSec>0.00000000</assetsAttrMiscSec>
      <assetsInvested>0.00000000</assetsInvested>
      <amtPayOneYrBanksBorr>2411200.00000000</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>0.51000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
          <monthlyTotReturn classId="C000002770" rtn1="3.44000000" rtn2="1.91000000" rtn3="3.16000000"/>
          <monthlyTotReturn classId="C000002769" rtn1="3.41000000" rtn2="1.89000000" rtn3="3.14000000"/>
        </monthlyTotReturns>
        <othMon1 netRealizedGain="1938925.88000000" netUnrealizedAppr="123852395.13000000"/>
        <othMon2 netRealizedGain="16543438.78000000" netUnrealizedAppr="45476094.14000000"/>
        <othMon3 netRealizedGain="3608546.02000000" netUnrealizedAppr="118878532.81000000"/>
      </returnInfo>
      <mon1Flow redemption="78853803.50000000" reinvestment="0.00000000" sales="47137408.53000000"/>
      <mon2Flow redemption="84611155.79000000" reinvestment="12289033.40000000" sales="53587659.81000000"/>
      <mon3Flow redemption="83772698.98000000" reinvestment="0.00000000" sales="45675344.36000000"/>


    </fundInfo>
    <invstOrSecs>
      <invstOrSec>
        <name>DFA Five-Year Global Fixed Income Portfolio</name>
        <lei>549300QPDV7M7W45YC55</lei>
        <title>DFA Five-Year Global Fixed Income Portfolio</title>
        <cusip>233203884</cusip>
        <identifiers>
          <isin value="US2332038841"/>
        </identifiers>
        <balance>17379234.15400000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>188912275.25000000</valUSD>
        <pctVal>4.798682075969</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 World ex US Government Fixed Income Portfolio</name>
        <lei>5493001KSJU4MGHNS208</lei>
        <title>DFA World ex US Government Fixed Income Portfolio</title>
        <cusip>23320G323</cusip>
        <identifiers>
          <isin value="US23320G3231"/>
        </identifiers>
        <balance>8566750.82800000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>92263906.42000000</valUSD>
        <pctVal>2.343654764681</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 Core Equity 2 Portfolio</name>
        <lei>549300ADSTXJ0S61X417</lei>
        <title>DFA US Core Equity 2 Portfolio</title>
        <cusip>233203397</cusip>
        <identifiers>
          <isin value="US2332033974"/>
        </identifiers>
        <balance>56068312.37800000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1259854979.13000000</valUSD>
        <pctVal>32.00238575641</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 Real Estate Securities Portfolio</name>
        <lei>5493005AU0YD5OZ5Q074</lei>
        <title>DFA Real Estate Securities Portfolio</title>
        <cusip>233203835</cusip>
        <identifiers>
          <isin value="US2332038353"/>
        </identifiers>
        <balance>1358238.45800000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>49562121.33000000</valUSD>
        <pctVal>1.258959286571</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 Core Equity Portfolio</name>
        <lei>5493006PNAH8EX4MI695</lei>
        <title>DFA International Core Equity Portfolio</title>
        <cusip>233203371</cusip>
        <identifiers>
          <isin value="US2332033719"/>
        </identifiers>
        <balance>39624251.28900000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>477472228.03000000</valUSD>
        <pctVal>12.12857883051</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 Core Equity 1 Portfolio</name>
        <lei>549300HFCYX77UDJN369</lei>
        <title>DFA US Core Equity 1 Portfolio</title>
        <cusip>233203413</cusip>
        <identifiers>
          <isin value="US2332034139"/>
        </identifiers>
        <balance>17290109.01000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>431561120.89000000</valUSD>
        <pctVal>10.96236130108</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 Inflation Protected Securities Portfolio</name>
        <lei>549300TG645KDIW1X492</lei>
        <title>DFA Inflation Protected Securities Portfolio</title>
        <cusip>233203355</cusip>
        <identifiers>
          <isin value="US2332033552"/>
        </identifiers>
        <balance>7619403.95200000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>99585609.65000000</valUSD>
        <pctVal>2.529638052474</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 Emerging Markets Core Equity Portfolio</name>
        <lei>549300JF8HO6EL9ROR31</lei>
        <title>DFA Emerging Markets Core Equity Portfolio</title>
        <cusip>233203421</cusip>
        <identifiers>
          <isin value="US2332034212"/>
        </identifiers>
        <balance>8610202.97700000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>173753896.08000000</valUSD>
        <pctVal>4.413634347717</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 Global Core Plus Fixed Income Portfolio</name>
        <lei>549300T4D7ZSYZ7PYY81</lei>
        <title>DFA Global Core Plus Fixed Income Portfolio</title>
        <cusip>25239Y386</cusip>
        <identifiers>
          <isin value="US25239Y3861"/>
        </identifiers>
        <balance>18322541.26700000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>199532474.40000000</valUSD>
        <pctVal>5.068452577843</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"/>
        </identifiers>
        <balance>35395773.39500000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>387229760.94000000</valUSD>
        <pctVal>9.836271944984</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 Selectively Hedged Global Fixed Income Portfolio</name>
        <lei>5493007FXNXFTGEH1168</lei>
        <title>DFA Selectively Hedged Global Fixed Income Portfolio</title>
        <cusip>233203223</cusip>
        <identifiers>
          <isin value="US2332032232"/>
        </identifiers>
        <balance>59618992.63200000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>579496608.38000000</valUSD>
        <pctVal>14.72016566439</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>2020-08-28</ncom:dateSigned>
      <ncom:nameOfApplicant>DIMENSIONAL INVESTMENT 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>
