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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,
 Wy5hkso0+esV/zVKVr2bpy8UiewKURg+8Rk9AO27UuDFLBznheN+4Ci2D4g5uHHD
 8LmmG0AutwZYWX3MINMy4g==

<SEC-DOCUMENT>0000050341-04-000017.txt : 20040105
<SEC-HEADER>0000050341-04-000017.hdr.sgml : 20040105
<ACCEPTANCE-DATETIME>20040105084358
ACCESSION NUMBER:		0000050341-04-000017
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040101
FILED AS OF DATE:		20040105

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FLEETBOSTON FINANCIAL CORP
		CENTRAL INDEX KEY:			0000050341
		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
		IRS NUMBER:				050341324
		STATE OF INCORPORATION:			RI
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		100 FEDERAL STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
		BUSINESS PHONE:		6174342200

	MAIL ADDRESS:	
		STREET 1:		100 FEDERAL STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FLEET BOSTON CORP
		DATE OF NAME CHANGE:	19991001

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FLEET NORSTAR FINANCIAL GROUP INC
		DATE OF NAME CHANGE:	19920525

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FLEET FINANCIAL GROUP INC
		DATE OF NAME CHANGE:	19880110

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			TREGURTHA PAUL R
		CENTRAL INDEX KEY:			0001183309

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-16431
		FILM NUMBER:		04501964

	BUSINESS ADDRESS:	
		STREET 1:		C/O MORMAC MARINE GROUP INC
		STREET 2:		ONE LANDMARK SQUARE SUITE 710
		CITY:			GREENWICH
		STATE:			CT
		ZIP:			06901
		BUSINESS PHONE:		2036257801

	MAIL ADDRESS:	
		STREET 1:		C/O MORMAC MARINE GROUP INC
		STREET 2:		ONE LANDMARK SQUARE SUITE 710
		CITY:			GREENWICH
		STATE:			CT
		ZIP:			06901
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType><periodOfReport>2004-01-01</periodOfReport>
    <issuer>
        <issuerCik>0000050341</issuerCik>
        <issuerName>FLEETBOSTON FINANCIAL CORP</issuerName>
        <issuerTradingSymbol>FBF</issuerTradingSymbol></issuer><reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001183309</rptOwnerCik>
            <rptOwnerName>TREGURTHA PAUL R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>MORMAC MARINE GROUP, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>ONE LANDMARK SQUARE, SUITE 710</rptOwnerStreet2>
            <rptOwnerCity>STAMFORD</rptOwnerCity>
            <rptOwnerState>CT</rptOwnerState>
            <rptOwnerZipCode>06910-2608</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><derivativeTable><derivativeTransaction><securityTitle><value>Stock Units</value></securityTitle><conversionOrExercisePrice><footnoteId id="F1"/></conversionOrExercisePrice><transactionDate><value>2004-01-01</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>A</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>429.5533</value></transactionShares><transactionPricePerShare><value>43.65</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><footnoteId id="F1"/></exerciseDate><expirationDate><footnoteId id="F1"/></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingS
ecurityShares><value>429.5533</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>19453.7037</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeTransaction><derivativeTransaction><securityTitle><value>Stock Units</value></securityTitle><conversionOrExercisePrice><footnoteId id="F1"/></conversionOrExercisePrice><transactionDate><value>2004-01-01</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>I</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>263.9565</value></transactionShares><transactionPricePerShare><value>43.65</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></tra
nsactionAmounts><exerciseDate><footnoteId id="F1"/></exerciseDate><expirationDate><footnoteId id="F1"/></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>263.9565</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>19717.6602</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeTransaction></derivativeTable><footnotes><footnote id="F1">Stock units are payable, 1 for 1, in shares of FBF common stock following the reporting person's retirement or resignation from the Board of Directors.</footnote></footnotes><remarks/><ownerSignature><signatureName>Martha R. Francis,  Attorney-in-Fact for Paul R. Tregurtha</signatureName><signatureDate>2004-01-05</signatureDate></ownerSignat
ure></ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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