-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 RapA3t+SDpcnriTBB4u7xbgR0Ui6r5LlzIOeh/Hsds/QMTSEiAXLv3BB8b5JfeGV
 v3VUNNfpXg+h0Olf4wUdRw==

<SEC-DOCUMENT>0001194137-10-000003.txt : 20100630
<SEC-HEADER>0001194137-10-000003.hdr.sgml : 20100630
<ACCEPTANCE-DATETIME>20100630145412
ACCESSION NUMBER:		0001194137-10-000003
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20100629
FILED AS OF DATE:		20100630
DATE AS OF CHANGE:		20100630

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BIENSTOCK GREGG L
		CENTRAL INDEX KEY:			0001194137

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-10777
		FILM NUMBER:		10926881

	MAIL ADDRESS:	
		STREET 1:		C/O AMBAC FINANCIAL GROUP INC
		STREET 2:		1 STATE STREET PLAZA
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10004

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AMBAC FINANCIAL GROUP INC
		CENTRAL INDEX KEY:			0000874501
		STANDARD INDUSTRIAL CLASSIFICATION:	SURETY INSURANCE [6351]
		IRS NUMBER:				133621676
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		ONE STATE ST PLZ
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10004
		BUSINESS PHONE:		2126680340

	MAIL ADDRESS:	
		STREET 1:		ONE STATE ST PLZ
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10004

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	AMBAC INC /DE/
		DATE OF NAME CHANGE:	19930328
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-06-29</periodOfReport>

    <issuer>
        <issuerCik>0000874501</issuerCik>
        <issuerName>AMBAC FINANCIAL GROUP INC</issuerName>
        <issuerTradingSymbol>ABK</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001194137</rptOwnerCik>
            <rptOwnerName>BIENSTOCK GREGG L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>AMBAC FINANCIAL GROUP, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>ONE STATE STREET PLAZA</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10004</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Senior Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-06-29</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>26290</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>.66</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>53039</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-06-29</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>14100</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>.67</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>38939</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>13766</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Savings Plan Trust</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Based on a plan statement as of May 31, 2010.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Patricia Lo Cascio,  Attorney in Fact for Gregg L. Bienstock</signatureName>
        <signatureDate>2010-06-30</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>bienstock.txt
<DESCRIPTION>POWER OF ATTORNEY
<TEXT>
POWER OF ATTORNEY

I, GREGG L. BIENSTOCK, do hereby nominate, constitute and appoint each of
Kevin J. Doyle, Anne Gill Kelly and Patricia LoCascio as my true and
lawful agent and attorney-in-fact, with full power and authority to act
hereunder, in his or her discretion, in my name and on my behalf as fully
as I could if I were present and acting in person, to make any and all
required or voluntary filings under Section 16(a) of the Securities Exchange
Act of 1934, as amended (the "Exchange Act"), and the applicable rules
and regulationsthereunder, with the Securities and Exchange Commission,
the New York StockExchange, Ambac Financial Group, Inc., a Delaware corporation
(the "Company"), and any other person or entity to which such filings may be
required under Section 16(a) of the Exchange Act as a result of my service
as an officer of the Company or beneficial ownership (within the meaning of
Section 16(a) of the Exchange Act) of more than ten percent of any class of
equity securities of the Company.

I hereby consent to, ratify and confirm all that each said attorney-in-fact
shall do or cause to be done by virtue of this Power of Attorney.  I hereby
acknowledge that each attorney-in-fact, in serving in such capacity at my
request, is not assuming, nor is the Company assuming, any of my
responsibilities to comply with Section 16 of the Exchange Act.

This Power of Attorney shall remain in full force and effect from this
date forward for so long as I am an officer or director of the Company
and for such time thereafter as may be necessary to make any such filings or
until revoked or modified by me.  I hereby revoke all prior powers of
attorney relating to the foregoing acts.

IN WITNESS WHEREOF, I have hereunto signed my name this 7th day of
January, 2010.

/s/ Gregg L. Bienstock
GREGG L. BIENSTOCK
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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