Registration No. 333-50522
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                          ----------------------------

                         POST-EFFECTIVE AMENDMENT NO. 1

                                       TO

                                    FORM S-8
                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933
                          ----------------------------

                         BARRETT BUSINESS SERVICES, INC.
             (Exact name of registrant as specified in its charter)

            Maryland                                  52-0812977
  (State or other jurisdiction of            (IRS Employer Identification No.)
   incorporation or organization)

                            4724 S.W. Macadam Avenue
                             Portland, Oregon 97239
                            Telephone (503) 220-0988
          (Address and telephone number of principal executive offices)

           BARRETT BUSINESS SERVICES, INC., 1993 STOCK INCENTIVE PLAN
                            (Full title of the plan)

                               William W. Sherertz
                                    President
                         Barrett Business Services, Inc.
                            4724 S.W. Macadam Avenue
                             Portland, Oregon 97239
                            Telephone (503) 220-0988
           (Name, address, and telephone number of agent for service)
                          ----------------------------

                                   Copies to:
                                 Miller Nash LLP
                              111 S.W. Fifth Avenue
                           Portland, Oregon 97204-3699
                              Attn: Mary Ann Frantz
                                 (503) 224-5858
                          ----------------------------



                                 DEREGISTRATION

     Pursuant to Registration  Statement on Form S-8 (No.  333-50522) filed with
the Securities and Exchange  Commission on November 22, 2000,  Barrett  Business
Services,  Inc., a Maryland  corporation,  registered  250,000  shares of common
stock,  $0.01 par value per  share,  for  issuance  under the  Barrett  Business
Services,  Inc.,  1993 Stock  Incentive  Plan. Of the 250,000 shares  originally
registered,  0 shares were sold. The Registration Statement is hereby amended to
deregister 250,000 shares of common stock, $0.01 par value per share, of Barrett
Business Services, Inc.


                                      II-1




                                   SIGNATURES

     Pursuant to the  requirements of the Securities Act of 1933, the registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-8 and has  duly  caused  this  registration
statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized,  in the city of Portland,  state of Oregon,  on the 30th day of May,
2003.

                                      BARRETT BUSINESS SERVICES, INC.
                                      (Registrant)


                                      By     /s/ Michael E. Mulholland
                                             -------------------------
                                             Michael D. Mulholland
                                             Vice President-Finance

     Pursuant  to  the   requirements  of  the  Securities  Act  of  1933,  this
registration  statement  has  been  signed  by  the  following  persons  in  the
capacities indicated as of the 30th day of May, 2003.



        Signature                                        Title

(1) Principal Executive Officer and Director:

WILLIAM W. SHERERTZ*                      President and Chief Executive Officer
                                          and Director

(2) Principal Financial Officer:

/s/ Michael D. Mulholland                 Vice President-Finance
-------------------------
Michael D. Muholland


(3) Principal Accounting Officer:

JAMES D. MILLER*                          Controller


(4) A majority of the Board of Directors:


/s/ Fores J. Beaudry                      Director
------------------------
Fores J. Beaudry


/s/ Thomas J. Carley                      Director
------------------------
Thomas J. Carley


/s/ James B. Hicks                        Director
------------------------
James B. Hicks


ANTHONY MEEKER*                           Director
NANCY B. SHERERTZ*                        Director


*By      /s/ Michael D. Mulholland
         -------------------------
         Michael D. Mulholland
         Attorney-in-fact
                                      II-2