-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Us20gXknMnDDgzxi5fNhiLvejod8VkgO/qmSkdj/xE+3C5V3IvX8+HONrZ/Lfsir
 FxDQlw8nbd58aL7ibe2L/w==

<SEC-DOCUMENT>0001291856-09-000004.txt : 20090310
<SEC-HEADER>0001291856-09-000004.hdr.sgml : 20090310
<ACCEPTANCE-DATETIME>20090310145712
ACCESSION NUMBER:		0001291856-09-000004
CONFORMED SUBMISSION TYPE:	D
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
FILED AS OF DATE:		20090310
DATE AS OF CHANGE:		20090310
EFFECTIVENESS DATE:		20090310

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Monterosso Fund I lp
		CENTRAL INDEX KEY:			0001291856
		IRS NUMBER:				200834146
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-65968
		FILM NUMBER:		09669094

	BUSINESS ADDRESS:	
		STREET 1:		4010 PALOS VERDES DR NORTH STE 200
		CITY:			ROLLING HILL ESTATES
		STATE:			CA
		ZIP:			90274
		BUSINESS PHONE:		(310) 544-4374

	MAIL ADDRESS:	
		STREET 1:		4010 PALOS VERDES DR NORTH STE 200
		CITY:			ROLLING HILL ESTATES
		STATE:			CA
		ZIP:			90274
</SEC-HEADER>
<DOCUMENT>
<TYPE>D
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0201</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001291856</cik>
        <entityName>Monterosso Fund I lp</entityName>
        <issuerAddress>
            <street1>4010 PALOS VERDES DR NORTH STE 200</street1>
            <street2></street2>
            <city>ROLLING HILL ESTATES</city>
            <stateOrCountry>CA</stateOrCountry>
            <zipCode>90274</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>(310) 544-4374</issuerPhoneNumber>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <jurisdictionOfInc>DE</jurisdictionOfInc>
        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2004</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Ryan</firstName>
                <middleName>Steven</middleName>
                <lastName>Deming</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>26802 Rolling Hills Road</street1>
                <street2></street2>
                <city>Rolling Hills Estates</city>
                <stateOrCountry>CA</stateOrCountry>
                <zipCode>90274</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Partner of General Partner</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Mark</firstName>
                <middleName>Thomas</middleName>
                <lastName>Busch</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>4501 Palos Verdes Drive North</street1>
                <street2></street2>
                <city>Rolling Hills Estates</city>
                <stateOrCountry>CA</stateOrCountry>
                <zipCode>90274</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Partner of General Partner</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Steven</firstName>
                <middleName>William</middleName>
                <lastName>Deming</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>727 Esplanade</street1>
                <street2>#306</street2>
                <city>Redondo Beach</city>
                <stateOrCountry>CA</stateOrCountry>
                <zipCode>90277</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Patner of General Partner</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Pooled Investment Fund</industryGroupType>
            <investmentFundInfo>
                <investmentFundType>Hedge Fund</investmentFundType>
                <is40Act>true</is40Act>
            </investmentFundInfo>
        </industryGroup>
        <issuerSize>
            <aggregateNetAssetValueRange>$1 - $5,000,000</aggregateNetAssetValueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2004-06-01</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>50000</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>Indefinite</totalOfferingAmount>
            <totalAmountSold>1000000</totalAmountSold>
            <totalRemaining>Indefinite</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>8</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>true</authorizedRepresentative>
            <signature>
                <issuerName>Monterosso Fund I lp</issuerName>
                <signatureName>Ryan Deming</signatureName>
                <nameOfSigner>Ryan Deming</nameOfSigner>
                <signatureTitle>Partner of General Partner</signatureTitle>
                <signatureDate>2009-03-10</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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