Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Wilfred J. Corrigan, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the ended annual Report of LSI Logic Corporation on Form 10-K for the year ended December 31, 2003, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Form 10- K fairly presents, in all material respects, the financial condition and results of operations of LSI Logic Corporation. 

By:	/s/  WILFRED J. CORRIGAN
Name:	Wilfred J. Corrigan
Title:	Chairman & Chief Executive Officer