<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0704</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001137293</cik>
        <entityName>CHEVRON PHILLIPS CHEMICAL CO LP</entityName>
        <issuerAddress>
            <street1>10001 SIX PINES DR</street1>
            <city>THE WOODLANDS</city>
            <stateOrCountry>TX</stateOrCountry>
            <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
            <zipCode>77380</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>8328134100</issuerPhoneNumber>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <overFiveYears>true</overFiveYears>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Gregory</firstName>
                <middleName>C.</middleName>
                <lastName>Garland</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Chevron Phillips Chemical Company LP</street1>
                <street2>10001 Six Pines Drive</street2>
                <city>The Woodlands</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>77380</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Non-voting director of issuer's non-operating parent holding company (Chevron Phillips Chemical Company LLC)</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Gregory</firstName>
                <middleName>G.</middleName>
                <lastName>Maxwell</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Chevron Phillips Chemical Company LP</street1>
                <street2>10001 Six Pines Drive</street2>
                <city>The Woodlands</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>77380</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Non-voting director of issuer's non-operating parent holding company (Chevron Phillips Chemical Company LLC)</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>W.</firstName>
                <middleName>C.W.</middleName>
                <lastName>Chiang</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o ConocoPhillips</street1>
                <street2>600 North Dairy Ashford</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>77079</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Director of issuer's non-operating parent holding company (Chevron Phillips Chemical Company LLC)</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>J.</firstName>
                <middleName>E.</middleName>
                <lastName>Lowe</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o ConocoPhillips</street1>
                <street2>600 North Dairy Ashford</street2>
                <city>Houston</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>77079</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Director of issuer's non-operating parent holding company (Chevron Phillips Chemical Company LLC)</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>J.</firstName>
                <middleName>Steve</middleName>
                <lastName>Farrand</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Chevron Corporation</street1>
                <street2>2005 Diamond Boulevard, Room 2182L</street2>
                <city>Concord</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>94520</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Director of issuer's non-operating parent holding company (Chevron Phillips Chemical Company LLC)</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Gary</firstName>
                <lastName>Yesavage</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Chevron Corporation</street1>
                <street2>6101 Bollinger Canyon Road, BR1X-5454</street2>
                <city>San Ramon</city>
                <stateOrCountry>CA</stateOrCountry>
                <stateOrCountryDescription>CALIFORNIA</stateOrCountryDescription>
                <zipCode>94583</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Director of issuer's non-operating parent holding company (Chevron Phillips Chemical Company LLC)</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Timothy</firstName>
                <middleName>G.</middleName>
                <lastName>Taylor</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Chevron Phillips Chemical Company LP</street1>
                <street2>10001 Six Pines Drive</street2>
                <city>The Woodlands</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>77380</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Mark</firstName>
                <middleName>A.</middleName>
                <lastName>Haney</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Chevron Phillips Chemical Company LP</street1>
                <street2>10001 Six Pines Drive</street2>
                <city>The Woodlands</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>77380</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Timothy</firstName>
                <middleName>J.</middleName>
                <lastName>Hill</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Chevron Phillips Chemical Company LP</street1>
                <street2>10001 Six Pines Drive</street2>
                <city>The Woodlands</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>77380</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Rick</firstName>
                <middleName>L.</middleName>
                <lastName>Roberts</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Chevron Phillips Chemical Company LP</street1>
                <street2>10001 Six Pines Drive</street2>
                <city>The Woodlands</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>77380</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Peggy</firstName>
                <middleName>C.</middleName>
                <lastName>Colsman</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Chevron Phillips Chemical Company LP</street1>
                <street2>10001 Six Pines Drive</street2>
                <city>The Woodlands</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>77380</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Mary</firstName>
                <middleName>Jane</middleName>
                <lastName>Hagenson</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Chevron Phillips Chemical Company LP</street1>
                <street2>10001 Six Pines Drive</street2>
                <city>The Woodlands</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>77380</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Mark</firstName>
                <middleName>E.</middleName>
                <lastName>Lashier</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Chevron Phillips Chemical Company LP</street1>
                <street2>10001 Six Pines Drive</street2>
                <city>The Woodlands</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>77380</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Chantal</firstName>
                <middleName>D.</middleName>
                <lastName>Veevaete</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Chevron Phillips Chemical Company LP</street1>
                <street2>10001 Six Pines Drive</street2>
                <city>The Woodlands</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>77380</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>M.</firstName>
                <middleName>S. (Scott)</middleName>
                <lastName>Sharp</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Chevron Phillips Chemical Company LP</street1>
                <street2>10001 Six Pines Drive</street2>
                <city>The Woodlands</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>77380</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Other Energy</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2010-06-30</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isOtherType>true</isOtherType>
            <descriptionOfOtherType>Interests in the issuer's non-qualified Deferred Compensation Plan</descriptionOfOtherType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>Indefinite</totalOfferingAmount>
            <totalAmountSold>0</totalAmountSold>
            <totalRemaining>Indefinite</totalRemaining>
            <clarificationOfResponse>Offering consists of an opportunity for executives of Chevron Phillips Chemical Company LP to defer compensation under a non-qualified plan. The amount deferred depends upon future compensation which has not yet been determined.</clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>39</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse>Any amounts payable to an executive officer would consist of compensation deferred by him or her, plus any investment gain or loss.</clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>CHEVRON PHILLIPS CHEMICAL CO LP</issuerName>
                <signatureName>/s/ Timothy J. Hill</signatureName>
                <nameOfSigner>Timothy J. Hill</nameOfSigner>
                <signatureTitle>Senior Vice President, Corporate Secretary &amp; General Counsel</signatureTitle>
                <signatureDate>2010-07-14</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
