FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person *   Sondergaard Peter 2. Date of Event Requiring Statement (Month/Day/Year) 11/01/2004 3. Issuer Name and Ticker or Trading Symbol GARTNER INC [IT] (Last) (First) (Middle) 56 TOP GALLANT ROAD, P.O. BOX 10212 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) SVP, Research Content 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) STAMFORD, CT 06904-2212 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Common Stock Class A 13,624 (1) D Â

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Non Qualified Stock Option (right to buy)	11/09/2000(2)	11/09/2009	Common Stock Class A	60,000	$ 10.313	D	Â
Non Qualified Stock Option (right to buy)	12/15/2006(3)	12/15/2008	Common Stock Class A	4,000	$ 19.285	D	Â
Non Qualified Stock Option (right to buy)	02/24/1998(2)	02/24/2007	Common Stock Class A	10,000	$ 19.666	D	Â
Non Qualified Stock Option (right to buy)	01/28/2007(4)	01/28/2009	Common Stock Class A	5,500	$ 22.705	D	Â
Non-Qualified Stock Option (right to buy)	12/13/2003(5)	12/13/2002	Common Stock Class A	3,641	$ 9.05	D	Â
Non-Qualified Stock Option (right to buy)	11/28/2002(5)	11/28/2011	Common Stock Class A	5,850	$ 9.1	D	Â
Non-Qualified Stock Option (right to buy)	06/01/2005(6)	06/01/2014	Common Stock Class A	12,000	$ 12.45	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Sondergaard Peter 56 TOP GALLANT ROAD P.O. BOX 10212 STAMFORD, CT 06904-2212	Â	Â	  SVP, Research Content	Â

Signatures

By: /s/ Gary Papilsky For: Peter Sondergaard		11/10/2004
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	168 of total shares are restricted with respect to their transferability. The restriction on transferability lapses in six substantially equal annual installments, commencing two years after the date of grant, 1/28/1999. 500 restricted shares were originally granted.
(2)	This option is fully exercisable.
(3)	This option becomes exercisable 6 years from the date of grant, 12/15/98, subject to acceleration of vesting and exercisability upon the achievement of certain financial performance targets determined by the Board in its sole discretion, and which acceleration has not occurred as of the date hereof.
(4)	2,500 options are fully exercisable and 3,000 options becomes exercisable 6 years from the date of grant, 01/28/99, subject to acceleration of vesting and exercisability upon the achievement of certain financial performance targets determined by the Board in its sole discretion, and which acceleration has not occurred as of the date hereof.
(5)	The option becomes exercisable in three substantially equal annual installments commencing one year after the date of grant, 11/28/01.
(6)	The option becomes exercisable in three substantially equal annual installments commencing one year after the date of grant, 06/1/2004.

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