-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 I/GVc23xiuFmAFQr8bdXaJKaRe7jxPwxNslldX2uCwQn7xBaI8hFJXrplpuC4lf2
 JlHVFhpH8QdOY5my2NpwQQ==

<SEC-DOCUMENT>0000898432-10-000139.txt : 20100216
<SEC-HEADER>0000898432-10-000139.hdr.sgml : 20100215
<ACCEPTANCE-DATETIME>20100212182835
ACCESSION NUMBER:		0000898432-10-000139
CONFORMED SUBMISSION TYPE:	D
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
FILED AS OF DATE:		20100216
DATE AS OF CHANGE:		20100212
EFFECTIVENESS DATE:		20100216

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Endowment Institutional Fund, L.P.
		CENTRAL INDEX KEY:			0001478268
		IRS NUMBER:				271402213
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-138726
		FILM NUMBER:		10601677

	BUSINESS ADDRESS:	
		STREET 1:		4265 SAN FELIPE
		STREET 2:		8TH FLOOR
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77027
		BUSINESS PHONE:		713-993-4675

	MAIL ADDRESS:	
		STREET 1:		4265 SAN FELIPE
		STREET 2:		8TH FLOOR
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77027
</SEC-HEADER>
<DOCUMENT>
<TYPE>D
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0603</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001478268</cik>
        <entityName>Endowment Institutional Fund, L.P.</entityName>
        <issuerAddress>
            <street1>4265 SAN FELIPE</street1>
            <street2>SUITE 800</street2>
            <city>HOUSTON</city>
            <stateOrCountry>TX</stateOrCountry>
            <zipCode>77027</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>800-725-9456</issuerPhoneNumber>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2009</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>N/A</firstName>
                <lastName>The Endowment Fund GP, L.P.</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>4265 San Felipe</street1>
                <street2>Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77027</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>John</firstName>
                <middleName>A.</middleName>
                <lastName>Blaisdell</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o The Endowment Funds</street1>
                <street2>4265 San Felipe, Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77027</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Andrew</firstName>
                <middleName>B.</middleName>
                <lastName>Linbeck</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o The Endowment Funds</street1>
                <street2>4265 San Felipe, Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77027</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>A.</firstName>
                <middleName>Haag</middleName>
                <lastName>Sherman</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o The Endowment Funds</street1>
                <street2>4265 San Felipe, Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77027</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Roy</firstName>
                <middleName>V.</middleName>
                <lastName>Washington</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o The Endowment Funds</street1>
                <street2>4265 San Felipe, Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77027</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>John</firstName>
                <middleName>E.</middleName>
                <lastName>Price</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o The Endowment Funds</street1>
                <street2>4265 San Felipe, Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77027</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Adam</firstName>
                <middleName>L.</middleName>
                <lastName>Thomas</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o The Endowment Funds</street1>
                <street2>4265 San Felipe, Suite 800</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77027</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Pooled Investment Fund</industryGroupType>
            <investmentFundInfo>
                <investmentFundType>Hedge Fund</investmentFundType>
                <is40Act>true</is40Act>
            </investmentFundInfo>
        </industryGroup>
        <issuerSize>
            <aggregateNetAssetValueRange>Decline to Disclose</aggregateNetAssetValueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2010-02-01</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>100000</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>Indefinite</totalOfferingAmount>
            <totalAmountSold>4100000</totalAmountSold>
            <totalRemaining>Indefinite</totalRemaining>
            <clarificationOfResponse>Minimum Investment Amount may be waived.</clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>6</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Endowment Institutional Fund, L.P.</issuerName>
                <signatureName>/s/ John A. Blaisdell</signatureName>
                <nameOfSigner>John A. Blaisdell, Mnging Dir., The Endowment Fund Mgmt, LLC</nameOfSigner>
                <signatureTitle>G.P. of the Endowment Fund GP, L.P., Gen Part. of the Issuer</signatureTitle>
                <signatureDate>2010-02-09</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----