-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 b8ElKTm5Zee87EUlpnK8rQ==

<SEC-DOCUMENT>0001364223-09-000009.txt : 20090914
<SEC-HEADER>0001364223-09-000009.hdr.sgml : 20090914
<ACCEPTANCE-DATETIME>20090914135824
ACCESSION NUMBER:		0001364223-09-000009
CONFORMED SUBMISSION TYPE:	D/A
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
ITEM INFORMATION:		Investment Company Act Section 3(c)
ITEM INFORMATION:		Section 3(c)(7)
FILED AS OF DATE:		20090914
DATE AS OF CHANGE:		20090914
EFFECTIVENESS DATE:		20090914

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			LONGHORN ONSHORE INVESTORS LP
		CENTRAL INDEX KEY:			0001364223
		IRS NUMBER:				204509483
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-90115
		FILM NUMBER:		091067136

	BUSINESS ADDRESS:	
		STREET 1:		1445 ROSS AVENUE
		STREET 2:		SUITE 4450
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75202
		BUSINESS PHONE:		2144526260

	MAIL ADDRESS:	
		STREET 1:		1445 ROSS AVENUE
		STREET 2:		SUITE 4450
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75202
</SEC-HEADER>
<DOCUMENT>
<TYPE>D/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0502</schemaVersion>

    <submissionType>D/A</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001364223</cik>
        <entityName>LONGHORN ONSHORE INVESTORS LP</entityName>
        <issuerAddress>
            <street1>1445 ROSS AVENUE</street1>
            <street2>SUITE 4450</street2>
            <city>DALLAS</city>
            <stateOrCountry>TX</stateOrCountry>
            <zipCode>75202</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>2144526260</issuerPhoneNumber>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2006</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>N/A</firstName>
                <middleName></middleName>
                <lastName>Longhorn Capital Partners LP</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1445 Ross Avenue</street1>
                <street2>Suite 4450</street2>
                <city>Dallas</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>75202</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>General Partner</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Kristopher</firstName>
                <middleName>Noel</middleName>
                <lastName>Kristynik</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1445 Ross Avenue</street1>
                <street2>Suite 4450</street2>
                <city>Dallas</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>75202</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Manager of General Partner of General Partner</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Philip</firstName>
                <middleName>Miller</middleName>
                <lastName>Eckian</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1445 Ross Avenue</street1>
                <street2>Suite 4450</street2>
                <city>Dallas</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>75202</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Partner of General Partner of General Partner &amp; Chief Compliance Officer of General Partner</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Britton</firstName>
                <middleName>Len</middleName>
                <lastName>Brown</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1445 Ross Avenue</street1>
                <street2>Suite 4450</street2>
                <city>Dallas</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>75202</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Chief Financial Officer of General Partner</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Pooled Investment Fund</industryGroupType>
            <investmentFundInfo>
                <investmentFundType>Hedge Fund</investmentFundType>
                <is40Act>false</is40Act>
            </investmentFundInfo>
        </industryGroup>
        <issuerSize>
            <aggregateNetAssetValueRange>Decline to Disclose</aggregateNetAssetValueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
            <item>3C</item>
            <item>3C.7</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>true</isAmendment>
                <previousAccessionNumber>0001364223-09-000008</previousAccessionNumber>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2006-05-01</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList>
            <recipient>
                <recipientName>Frank Jodoin</recipientName>
                <recipientCRDNumber>258772</recipientCRDNumber>
                <associatedBDName>FIRST NEW YORK SECURITIES L.L.C.</associatedBDName>
                <associatedBDCRDNumber>16362</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>90 Park Avenue</street1>
                    <street2>5th Floor</street2>
                    <city>New York</city>
                    <stateOrCountry>NY</stateOrCountry>
                    <zipCode>10016</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <state>FL</state>
                    <state>GA</state>
                </statesOfSolicitationList>
            </recipient>
        </salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>Indefinite</totalOfferingAmount>
            <totalAmountSold>224829799</totalAmountSold>
            <totalRemaining>Indefinite</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>66</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>17347</dollarAmount>
                <isEstimate>true</isEstimate>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>LONGHORN ONSHORE INVESTORS LP</issuerName>
                <signatureName>Kristopher Kristynik</signatureName>
                <nameOfSigner>Kristopher Kristynik</nameOfSigner>
                <signatureTitle>Manager of General Partner of General Partner</signatureTitle>
                <signatureDate>2009-09-14</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----