EXHIBIT 32.1

                            LAM RESEARCH CORPORATION

                            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 Lam Research Corporation (the
"Company") on Form 10-K for the fiscal period ending June 29, 2003 as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), I,
James W. Bagley, Chairman and 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:

         (1) The Report fully complies with the requirements of section 13(a) or
15(d) of the Securities Exchange Act of 1934; and

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

September 24, 2003

                                            /s/ James W. Bagley
                                            ------------------------------------
                                            James W. Bagley
                                            Chairman and Chief Executive Officer