Filed Pursuant to Rule 424(b)(3)
                                                  Registration Number 333-45463
PROSPECTUS SUPPLEMENT NO. 10
(TO PROSPECTUS DATED MAY 6, 1998)
 
                                 $100,000,000
 
                                  P-COM, INC.
 
                4 1/4% CONVERTIBLE SUBORDINATED NOTES DUE 2002
                     INTEREST PAYABLE MAY 1 AND NOVEMBER 1
                          AND SHARES OF COMMON STOCK
                       ISSUABLE UPON CONVERSION THEREOF
 
  This Prospectus Supplement (this "Supplement") relates to $100,000,000
aggregate principal amount of 4 1/4% Convertible Subordinated Notes due 2002
(the "Notes") of P-Com, Inc., a Delaware corporation (together with its
subsidiaries, "P-Com" or the "Company"), and the shares of common stock, par
value of $.0001 per share, of the Company (the "Common Stock") which are
issuable upon conversion of the Notes (the "Shares"). The Notes and the Shares
that are being registered hereby are to be offered for the account of the
holders thereof (the "Selling Securityholders"). The Notes were originally
issued in a private placement consummated in November 1997. This Supplement is
not complete without, and may not be delivered or utilized except in
connection with, the prospectus dated May 6, 1998, as amended and supplemented
to date (the "Prospectus"). All capitalized terms used but not defined in this
Supplement shall have the meanings given them in the Prospectus.
 
                            SELLING SECURITYHOLDERS
 
  The following table sets forth the principal amount of Notes owned by
certain Selling Securityholder(s) who were not specifically identified in the
Prospectus and the number of Shares into which such Notes are convertible. The
table of Selling Securityholders in the Prospectus is hereby amended to
include the following Selling Securityholders:
 


                                                                     NUMBER OF
                                                                     SHARES OF
                                    AGGREGATE PRINCIPLE PERCENT OF  COMMON STOCK
                                      AMOUNT OF NOTES      NOTES      THAT MAY
BENEFICIAL HOLDER                    THAT MAY BE SOLD   OUTSTANDING  BE SOLD(1)
- -----------------                   ------------------- ----------- ------------
                                                           
United Gulf Bank (BSC) E.C. .......       250,000             *        9,104

- --------
 * Less than 1%
(1) Assumes a conversion price of $27.46 per share and a cash payment in lieu
    of any fractional share interest.
 
  The Company may amend or supplement the Prospectus and this Prospectus
Supplement from time to time to update the disclosure set forth therein and
herein.
 
          THE DATE OF THIS PROSPECTUS SUPPLEMENT IS DECEMBER 9, 1998.