Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350

As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Annual Report of International Game Technology (the “Company”) on Form 10-K for the period ended September 30, 2008 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Thomas J. Matthews, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. section 1350, as adopted pursuant to section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

(i) the Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 26, 2008

/s/ Thomas J. Matthews

Thomas J. Matthews

Chief Executive Officer

International Game Technology

This certification accompanies the above described Report on Form 10-K pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by such Act, be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.