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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,
 Q+6Mi4Unvx3tmWYw8TjbJeymAPIJ+OmZCYnRwR9QzQ+CVvkfGgcTZV/aP4Pk8Vdd
 GRSFar+XFf7d3yBTtN/UOQ==

<SEC-DOCUMENT>0001464275-09-000003.txt : 20090601
<SEC-HEADER>0001464275-09-000003.hdr.sgml : 20090601
<ACCEPTANCE-DATETIME>20090601152422
ACCESSION NUMBER:		0001464275-09-000003
CONFORMED SUBMISSION TYPE:	D
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
FILED AS OF DATE:		20090601
DATE AS OF CHANGE:		20090601
EFFECTIVENESS DATE:		20090601

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Warren Oil & Gas Development 2009, L.P.
		CENTRAL INDEX KEY:			0001464275
		IRS NUMBER:				364654855
		STATE OF INCORPORATION:			KY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-131625
		FILM NUMBER:		09864861

	BUSINESS ADDRESS:	
		STREET 1:		6244 NASHVILLE RD
		CITY:			BOWLING GREEN
		STATE:			KY
		ZIP:			42101
		BUSINESS PHONE:		270-843-0060

	MAIL ADDRESS:	
		STREET 1:		6244 NASHVILLE RD
		CITY:			BOWLING GREEN
		STATE:			KY
		ZIP:			42101

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	U S Energy Partners, Inc.
		DATE OF NAME CHANGE:	20090515
</SEC-HEADER>
<DOCUMENT>
<TYPE>D
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0401</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001464275</cik>
        <entityName>Warren Oil &amp; Gas Development 2009, L.P.</entityName>
        <issuerAddress>
            <street1>6244 NASHVILLE RD</street1>
            <street2></street2>
            <city>BOWLING GREEN</city>
            <stateOrCountry>KY</stateOrCountry>
            <zipCode>42101</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>270-843-0060</issuerPhoneNumber>
        <issuerPreviousNameList>
            <previousName>U S Energy Partners, Inc.</previousName>
        </issuerPreviousNameList>
        <jurisdictionOfInc>KENTUCKY</jurisdictionOfInc>
        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2009</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>U S Energy Partners, Inc.</firstName>
                <middleName></middleName>
                <lastName>U S Energy Partners, Inc.</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>6244 Nashville Rd</street1>
                <street2></street2>
                <city>Bowling Green</city>
                <stateOrCountry>KY</stateOrCountry>
                <zipCode>42101</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Promoter</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>General and/or Managing Partner</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Oil and Gas</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>No Revenues</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2009-05-26</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isMineralPropertyType>true</isMineralPropertyType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>35000</minimumInvestmentAccepted>
        <salesCompensationList>
            <recipient>
                <recipientName>Clay Shelton</recipientName>
                <recipientCRDNumber>None</recipientCRDNumber>
                <associatedBDName>None</associatedBDName>
                <associatedBDCRDNumber>None</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>6244 Nashville Rd</street1>
                    <street2></street2>
                    <city>Bowling Green</city>
                    <stateOrCountry>KY</stateOrCountry>
                    <zipCode>42101</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <value>All States</value>
                </statesOfSolicitationList>
            </recipient>
            <recipient>
                <recipientName>Aaron Grogan</recipientName>
                <recipientCRDNumber>None</recipientCRDNumber>
                <associatedBDName>None</associatedBDName>
                <associatedBDCRDNumber>None</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>6244 Nashville Rd</street1>
                    <street2></street2>
                    <city>Bowling Green</city>
                    <stateOrCountry>KY</stateOrCountry>
                    <zipCode>42101</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <value>All States</value>
                </statesOfSolicitationList>
            </recipient>
            <recipient>
                <recipientName>Brent Phelps</recipientName>
                <recipientCRDNumber>None</recipientCRDNumber>
                <associatedBDName>None</associatedBDName>
                <associatedBDCRDNumber>None</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>6244 Nashville Rd</street1>
                    <street2></street2>
                    <city>Bowling Green</city>
                    <stateOrCountry>KY</stateOrCountry>
                    <zipCode>42101</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <value>All States</value>
                </statesOfSolicitationList>
            </recipient>
        </salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>875000</totalOfferingAmount>
            <totalAmountSold>75000</totalAmountSold>
            <totalRemaining>800000</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>3</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Warren Oil &amp; Gas Development 2009, L.P.</issuerName>
                <signatureName>Clay M Shelton</signatureName>
                <nameOfSigner>Clay M SHelton</nameOfSigner>
                <signatureTitle>Executive Officer</signatureTitle>
                <signatureDate>2009-06-01</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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