UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C.  20549
_________________

FORM S-8

REGISTRATION STATEMENT UNDER
THE SECURITIES ACT OF 1933
_________________

COGNOS INCORPORATED
(Exact Name of Registrant as Specified in Its Charter)

CANADA	98-0119485
(State or Other Jurisdiction of	(I.R.S. Employer Identification No.)
Incorporation or Organization)

3755 Riverside Drive
P.O. Box 9707, Station T
Ottawa, Ontario, Canada K1G 4K9
(Address of Principal Executive Offices) (Zip Code)

_________________

2003 – 2008 Stock Option Plan
(Full Title of the Plan)

_________________

William Russell
Cognos Corporation
15 Wayside Road
Burlington, MA 01803-4609
(Name and Address of Agent For Service)

(781) 229-6600
(Telephone Number, Including Area Code, of Agent For Service)

_________________

Copy to:
Kevin M. Barry, Esq.
Bingham McCutchen LLP
150 Federal Street
Boston, Massachusetts 02110

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Calculation Of Registration Fee

		Proposed Maximum	Proposed Maximum
Title of Securities to	Amount to be	Offering Price	Aggregate	Amount of
be Registered	Registered	Per Share	Offering Price	Registration Fee
Common Shares,	1,800,000 shares (1)	US$38.32 (2)	US$68,976,000	US$8,118.48
without par value

    (1)         This registration statement shall also cover any additional Common Shares which become issuable upon exercise of options granted under the Cognos Incorporated 2003-2008 Stock Option Plan by reason of any stock dividend, stock split, recapitalization or other similar transaction effected without the receipt of consideration which results in an increase in the number of outstanding Common Shares of Cognos Incorporated.

    (2)         The price of US$38.32 per share, which is the average of the high and low prices of the Common Stock as reported on the Nasdaq National Market System on October 4, 2005, is set forth solely for purposes of calculating the filing fee pursuant to Rules 457(c) and (h).

        This Registration Statement registers additional securities of the same class as other securities for which Registration Statement Nos. 333-107965 and 333-117981 on Form S-8, each relating to the Registrant’s 2003-2003 Stock Option Plan, and as filed with the Securities and Exchange Commission on August 14, 2003 and August 6, 2004, respectively, are effective. Pursuant to General Instruction E of Form S-8, the contents of the above listed Registration Statements are incorporated by reference herein.

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PART II

INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.    Incorporation of Documents by Reference.

        The following documents filed by Cognos Incorporated (the “Registrant” or the “Company”) with the Commission pursuant to the Securities Exchange Act of 1934, as amended (the “Exchange Act”) are incorporated by reference in this Registration Statement:

(a)        The Registrant's Form S-8, File No. 333-107965, filed on August 14, 2003 and the Registrant's Form 2-8, File No. 333-117981, filed on August 6, 2004.

(b)        The Registrant’s Annual Report on Form 10-K for the fiscal year ended February 28, 2005 which contains audited financial statements for the fiscal year ended February 28, 2005.

(c)        The Registrant's Quarterly Report on Form 10-Q for the fiscal quarter ended May 31, 2005 and the Registrant's Quarterly Report on Form 10-Q for the fiscal quarter ended August 31, 2005.

(d)        The Registrant's Current Report on Form 8-K filed on June 28, 2005.

(e)        The description of the Common Shares in the section entitled "Description of Share Capital" contained in the Registrant's Registration Statement on Form F-10 filed with the Commission on June 20, 2002.

                All documents subsequently filed with the Commission by the Registrant pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act, prior to the filing of a post-effective amendment which indicates that all securities offered herein have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference in this Registration Statement and to be a part hereof from the date of filing of such documents.

                Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for the purposes of this Registration Statement to the extent that a statement contained herein or in any other subsequently filed document that also is or is deemed to be incorporated by reference herein modifies or replaces such statement. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.

Item 5.    Interest of Named Experts and Counsel.

        Certain legal matters in connection with this Registration Statement will be passed upon on our behalf by Torys LLP, Toronto, Ontario. As of the date of this Registration Statement, the partners and associates of Torys LLP collectively own beneficially, directly or indirectly, less than 1% of the Company’s outstanding Common Shares. James M. Tory, is Chair Emeritus and Counsel of Torys LLP, and serves on our Board of Directors and as Lead Director.

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Item 8.    Exhibits.

        4.1         2003-2008 Stock Option Plan (incorporated by reference to Exhibit 10.30 to the Company’s Quarterly Report on Form 10-Q filed on
                      October 7, 2005).

        4.2         Articles of Incorporation of the Company and amendments thereto (incorporated by reference to Exhibit 3.1 to the Company’s Quarterly
                      Report on Form 10-Q filed on January 14, 2003 and Exhibit 3.1(i) to the Company’s Quarterly Report on Form 10-Q filed on July 8, 2004).

        4.3         By-Laws of the Company (incorporated by reference to Exhibit 3.3 to the Company’s Annual Report on Form 10-K on May 29, 2002).

        5.1         Opinion of Torys LLP.

      23.1         Consent of Ernst & Young LLP.

      23.2         Consent of Torys LLP (included in Exhibit 5.1).

      24.1         Power of Attorney (included in the signature pages of this Registration Statement).

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SIGNATURES

        Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Ottawa, Province of Ontario, Canada on the 7th day of October, 2005.

COGNOS INCORPORATED

By:   /s/  W. John Jussup                    

       W. John Jussup

       Senior Vice President, Chief Legal
        Counsel & Secretary

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POWER OF ATTORNEY AND SIGNATURES

        EACH PERSON WHOSE SIGNATURE appears below this Registration Statement hereby constitutes and appoints Tom Manley and W. John Jussup and each of them, with full power to act without the other, his true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead in any and all capacities (until revoked in writing) to sign all amendments (including post-effective amendments) to this Registration Statement on Form S-8 of Cognos Incorporated and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary fully to all intents and purposes as he might or could do in person thereby ratifying and confirming all that said attorneys-in-fact and agents or any of them, or their or his substitute, may lawfully do or cause to be done by virtue hereof.

        Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

Signature	Title(s)	Date
/s/ Robert G. Ashe	Chief Executive Officer, President	September 28, 2005
Robert G. Ashe	and Director (Principal Executive
	Officer)
/s/ Tom Manley	Senior Vice President,	September 28, 2005
Tom Manley	Finance and Administration
	and Chief Financial Officer
	(Principal Financial Officer and
	Principal Accounting Officer)
/s/ Renato Zambonini	Chairman of the Board	September 28, 2005
Renato Zambonini	of Directors
/s/ John E. Caldwell	Director	October 1, 2005
John E. Caldwell
/s/ Paul D. Damp	Director	October 4, 2005
Paul D. Damp
/s/ Pierre Y. Ducros	Director	October 4, 2005
Pierre Y. Ducros
/s/ Robert W. Korthals	Director	October 4, 2005
Robert W. Korthals
/s/ John J. Rando	Director	September 27, 2005
John J. Rando
/s/ James M. Tory	Director	September 27, 2005
James M. Tory, Q.C.
/s/ William Russell	Authorized Representative	September 27, 2005
William Russell	in the United States and Director

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AUTHORIZED REPRESENTATIVE

        Pursuant to the requirements of Section 6(a) of the Securities Act of 1933, as amended, the Authorized Representative has duly caused this Registration Statement to be signed on its behalf by the undersigned, solely in its capacity as the duly authorized representative of Cognos Incorporated in the United States, in the City of Saratoga, State of California, on this 27th day of September, 2005.

/s/ William Russell        

William Russell

Authorized U.S. Representative

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EXHIBIT INDEX

Exhibit No.	Description of Exhibit
4.1	2003-2008 Stock Option Plan (incorporated by reference to Exhibit 10.30 to the Company's Quarterly Report on Form 10-Q filed on October 7, 2005).
4.2	Articles of Incorporation of the Company and amendments thereto (incorporated by reference to Exhibit 3.1 to the Company's Quarterly Report on Form 10-Q filed on January 14, 2003 and Exhibit 3.1(i) to the Company's Quarterly Report on Form 10-Q filed on July 8, 2004).
4.3	By-Laws of the Company (incorporated by reference to Exhibit 3.3 to the Company's Annual Report on Form 10-K filed on May 29, 2002).
5.1	Opinion of Torys LLP.
23.1	Consent of Ernst & Young LLP.
23.2	Consent of Torys LLP (included in Exhibit 5.1).
24.1	Power of Attorney (included in the signature pages of this Registration Statement).