<SEC-DOCUMENT>0001561438-12-000001.txt : 20121101
<SEC-HEADER>0001561438-12-000001.hdr.sgml : 20121101
<ACCEPTANCE-DATETIME>20121101164817
ACCESSION NUMBER:		0001561438-12-000001
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20121030
FILED AS OF DATE:		20121101
DATE AS OF CHANGE:		20121101

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Glastra Matthijs
		CENTRAL INDEX KEY:			0001561438

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35083
		FILM NUMBER:		121174133

	MAIL ADDRESS:	
		STREET 1:		C/O GSI GROUP CORPORATION
		STREET 2:		125 MIDDLESEX TURNPIKE
		CITY:			BEDFORD
		STATE:			MA
		ZIP:			01730

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			GSI GROUP INC
		CENTRAL INDEX KEY:			0001076930
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES [3690]
		IRS NUMBER:				980110412
		STATE OF INCORPORATION:			A3
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		125 MIDDLESEX TURNPIKE
		STREET 2:		.
		CITY:			BEDFORD
		STATE:			MA
		ZIP:			01730
		BUSINESS PHONE:		781-266-5618

	MAIL ADDRESS:	
		STREET 1:		125 MIDDLESEX TURNPIKE
		STREET 2:		.
		CITY:			BEDFORD
		STATE:			MA
		ZIP:			01730

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GSI LUMONICS INC
		DATE OF NAME CHANGE:	19990401

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GSI LUMONICS
		DATE OF NAME CHANGE:	19990331

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	LUMONICS INC
		DATE OF NAME CHANGE:	19990115
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2012-10-30</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001076930</issuerCik>
        <issuerName>GSI GROUP INC</issuerName>
        <issuerTradingSymbol>GSIG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001561438</rptOwnerCik>
            <rptOwnerName>Glastra Matthijs</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O GSI GROUP CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>125 MIDDLESEX TURNPIKE</rptOwnerStreet2>
            <rptOwnerCity>BEDFORD</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01730</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Group President, Laser Product</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>No Securities Beneficially Owned</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <remarks>Exhibit 24:  Power of Attorney attached</remarks>

    <ownerSignature>
        <signatureName>Paula A Pluta, Attorney-in-Fact</signatureName>
        <signatureDate>2012-11-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>poa.txt
<DESCRIPTION>POWER OF ATTORNEY
<TEXT>
POWER OF ATTORNEY




      Know all by these presents that the undersigned hereby
constitutes and appoints Robert Buckley, Paula A. Pluta and
Joanna Tow as his true and lawful attorneys-in-fact to:
(1)	execute for and on behalf of the undersigned
Forms 3, 4 and 5 in accordance with Section
16(a) of the Securities Exchange Act of
1934, as amended, and the rules thereunder,
for and in relation to any and all reportable
transactions in the securities of GSI Group,
Inc.;
(2)	do and perform any and all acts for and on
behalf of the undersigned which may be
necessary or desirable to complete the
execution of any such Form 3, 4 and 5 and
timely filing of such forms with the United
States Securities and Exchange Commission
and any other authority; and
(3)	take any other action of any type whatsoever
in connection with the foregoing which, in
the opinion of such attorneys-in-fact, may be
of benefit to, in the best interest of, or
legally required by, the undersigned, it being
understood that the documents executed by
such attorneys-in-fact on behalf of the
undersigned pursuant to this Power of
Attorney shall be in such form and shall
contain such terms and conditions as such
attorneys-in-fact may approve in their
discretion.
      The undersigned hereby grants to each attorney-in-fact,
individually, full power and authority to do and perform all and
every act and thing whatsoever requisite, necessary and proper to
be done in the exercise of any of the rights and powers herein
granted, as fully to all intents and purposes as each attorney-in-fact
might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming that
each attorney-in-fact, or his substitute or substitutes, shall lawfully
do or cause to be done by virtue of this power of attorney and the
rights and powers herein granted.  The undersigned acknowledges
that the foregoing attorneys-in-fact, in serving in such capacity at
the request of the undersigned, are not assuming any of the
undersigned's responsibilities to comply with Section 16 of the
Securities Exchange Act of 1934, as amended.
      IN WITNESS WHEREOF, the undersigned has caused this
Power of Attorney to be executed as of this __30__ day of
______Oct_________, 2012.


	/s/ Matthijs Glastra
	Signature

	Matthijs Glastra
	Print Name
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
