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                                                FILED PURSUANT TO RULE 424(b)(3)
                                            REGISTRATION STATEMENT NO. 333-39167

PROSPECTUS SUPPLEMENT NO. 10
(TO PROSPECTUS DATED NOVEMBER 10, 1997)

                                  $310,000,000
                            LAM RESEARCH CORPORATION
                   5% CONVERTIBLE SUBORDINATED NOTES DUE 2002

     This Prospectus Supplement supplements information contained in that
certain Prospectus dated November 10, 1997 and supersedes Prospectus Supplement
No. 9 dated April 9, 1999 (the "Prospectus"), relating to the potential sale
from time to time of up to $310,000,000 aggregate amount of Notes and the Common
Stock issuable upon conversion thereof by the Selling Securityholders. This
Prospectus Supplement is not complete without, and may not be delivered or
utilized except in connection with, the Prospectus. Capitalized terms used
herein but not defined have the meanings assigned to such terms in the
Prospectus.

     The following information is added in the appropriate alphabetical sequence
to the table set forth in the Prospectus under the caption "Selling
Securityholders" with respect to the Selling Securityholders and the respective
principal amounts of Registrable Notes beneficially owned by such Selling
Securityholder that may be offered pursuant to the Prospectus, as amended or
supplemented:

                                                                  
     Arnhold and S. Bleichoeder Inc...........      68,000     *        774    *
     People's Bank............................   1,000,000     *     11,393



     The line item "Forum Capital Markets LLC, 31,000, *, 353, *" contained in
the table set forth in the Prospectus under the caption "Selling
Securityholders" is deleted in its entirety and replaced with the following:

                                                                  
     Forum Capital Markets LLC................     247,000     *      2,814    *



     The following line items contained in the table set forth in the Prospectus
under the caption "Selling Securityholders" are deleted in their entirety.

                                                                   
     BancBoston Robertson Stephens & Co.......      44,000     *        501    *
     NationsBanc Montgomery Securities, LLC...   5,000,000   1.61%   59,967    *



     The last three line items contained in the table set forth in the
Prospectus under the caption "Selling Securityholders": "Any other holder . . .
" , "Notes Sold Under Registration Statement", and "Total . . . " (other than
the footnotes to the table which remain unchanged), are deleted in their
entirety and replaced with the following:

                                                                
     Any other holder of Notes or future
     transferee from any such holder (3) .....
     Notes Sold Under
     Registration Statement...................   $223,914,000            2,551,145
               Total..........................   $310,000,000    100%    3,531,958




     All information provided in this Prospectus Supplement is as of July 14,
1999.

            THE DATE OF THIS PROSPECTUS SUPPLEMENT IS JULY 14, 1999.