1

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


PROSPECTUS SUPPLEMENT NO. 1
(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 (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 shall be 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: 

                                                                                               
Canadian Imperial Holdings, Inc. .............................      3,000,000        *          34,180      *
Chase Securities .............................................      8,000,000      2.58%        91,147      *
Consolidated Press International, Ltd. .......................      2,570,000        *          29,281      *
Farallon Capital Institutional Partners II, L.P. .............      2,485,000        *          28,312      *
Farallon Capital Institutional Partners III, L.P. ............        210,000        *           2,392      *
Farallon Capital Institutional Partners L.P. .................      8,900,000      2.87%       101,401      *
Farallon Capital Offshore Investors, Inc. ....................     11,395,000      3.68%       129,827      *
Farallon Capital Partners, L.P. ..............................      9,400,000      3.03%       107,098      *
Forum Capital Markets, L.P. ..................................      2,000,000        *          22,786      *
Foundation Account No. 1 .....................................        355,000        *           4,044      *
LLC Account No. 1 ............................................        155,000        *           1,765      *
McMahan Securities Company, L.P. .............................        200,000        *           2,278      *
North Star Hedge Fund, L.P. ..................................      1,500,000        *          17,090      *
Paloma Securities, LLC .......................................      8,800,000      2.84%       100,262      *
Silverton International Fund Limited .........................      6,900,000      2.23%        78,614      *
SoundShore Partners, L.P. ....................................      2,000,000        *          22,786      *
The Common Fund ..............................................        880,000        *           9,684      *
Tinicum Partners, L.P. .......................................        190,000        *           2,164      *
UBS Securities, LLC ..........................................     18,900,000      6.10%       215,335      *
Winchester Convertible Plus, Ltd. ............................        510,000        *           5,810      *



     The following line items contained in the table set forth in the Prospectus
under the caption "Selling Securityholders" shall be deleted in their entirety: 

                                                                                               
CFW-C, L.P. ..................................................      3,900,000      1.26%        44,434      *
KA Management, Ltd. ..........................................        500,000        *           5,696      *
KA Trading L.P. ..............................................        500,000        *           5,696      *
NatWest Securities, Ltd. .....................................     30,822,000      9.94%       351,167      *
General Motors Employees Domestic Group 
  Pension Trust, Mellon Bank, N.A. as Trustee ................      1,500,000        *          17,090      *



     The line items "Deutsche Bank New York Custody Services.... 35,250,000,
11.37%, 401,617,1.07", "Deutsche Morgan Grenfell 6,900,000, 2.25%, 79,218, *",
"R2 Investments, LDC, 1,250,000, *, 14,241, *", "Societe General Securities
Corp., 3,400,000, 1.10%, 38,737, *" and "Shepard Investment International, Ltd.,
13,178,000, 4.25%, 150,142, *"," contained in the table set forth in the
Prospectus under the caption "Selling Securityholders" shall be deleted in
their entirety and replaced with the following:

                                                                                               
Deutsche Bank New York Custody Services ......................     10,250,000      3.31%       116,782      *
Deutsche Morgan Grenfell .....................................      1,960,000        *          22,331      *
R2 Investments, LDC ..........................................        750,000        *           8,545      *
Shepard Investment International, Ltd. .......................      7,245,000      2.34%        82,595      *
Societe General Securities Corp. .............................      2,400,000        *          27,344      *



     The last two line items contained in the table set forth in the Prospectus
under the caption "Selling Securityholders", "Any other holder..." and
"Total..." (other than the footnotes thereto which remain unchanged), shall be
deleted in their entirety and replaced with the following:

                                                                              
Any other holder of Notes or future
transferee from any such holder(3) ...........   $129,612,500                1,476,728   

Notes Sold Under
Registration Statement .......................   $ 74,655,000                  850,575    

      Total ..................................   $310,000,000    100%        3,531,930    



             All information provided in this Prospectus Supplement
                           is as of January 23, 1998.

         THE DATE OF THIS PROSPECTUS SUPPLEMENTAL IS JANUARY 27, 1998.