EXHIBIT 11.1
 
                            LAM RESEARCH CORPORATION
             STATEMENT OF COMPUTATION OF EARNINGS (LOSS) PER SHARE
                FOR THE YEARS ENDED JUNE 30, 1997, 1996 AND 1995
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 


                                                                      FULLY
                                                           PRIMARY   DILUTED
                                                           --------  --------
                                                               
Year-ended June 30, 1997
Net loss.................................................. $(33,634) $(33,634)
                                                           --------  --------
                                                           $(33,634) $(33,634)
                                                           ========  ========
Average shares outstanding................................   30,600    30,600
                                                           --------  --------
Common and common equivalent shares used in computing per
 share amounts............................................   30,600    30,600
                                                           ========  ========
Net loss per share........................................   ($1.10)   ($1.10)
                                                           ========  ========
Year-ended June 30, 1996
Net Income................................................ $141,091  $141,091
Add interest expense on convertible subordinated
 debentures, net of tax...................................      --      3,264
                                                           --------  --------
                                                           $141,091  $144,355
                                                           ========  ========
Average shares outstanding................................   27,768    27,768
Net effect of dilutive stock options......................      932       950
Assumed conversion of subordinated debentures.............      --      2,222
                                                           --------  --------
Common and common equivalent shares used in computing per
 share amounts............................................   28,700    30,940
                                                           ========  ========
Net income per share...................................... $   4.92  $   4.67
                                                           ========  ========
Year-ended June 30, 1995
Net income................................................ $ 89,211  $ 89,211
Add interest expense on convertible subordinated
 debentures, net of tax...................................      --      3,455
                                                           --------  --------
                                                           $ 89,211  $ 92,666
                                                           ========  ========
Average shares outstanding................................   26,090    26,090
Net effect of dilutive stock options......................    1,210     1,570
Assumed conversion of subordinated debentures.............      --      2,640
                                                           --------  --------
Common and common equivalent shares used in computing per
 share amounts............................................   27,300    30,300
                                                           ========  ========
Net income per share...................................... $   3.27  $   3.06
                                                           ========  ========