We consent to the incorporation by reference in the registration statement (No.
333-137401) on Form
S-3 and the registration statements (No.
33-85926, No. 33-092486, No.
333-77013, No.
333-77015, No.
333-30546, No.
333-91256, No.
333-97557, No.
333-104753, No.
333-120767, and No.
333-127349) on
Form S-8 of Gartner, Inc. of our reports dated
February 20, 2009, with respect to the consolidated
balance sheets of Gartner, Inc. as of
December 31, 2008 and
2007 and the related consolidated
statements of operations, stockholders’ (deficit) equity and comprehensive income, and cash flows
for each of the years in the three-year period ended
December 31, 2008, and the effectiveness of
internal control over financial reporting as of
December 31, 2008, which reports appear in the
December 31, 2008 annual report on Form 10-K of Gartner, Inc.