SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549



                                    FORM 8-K



                             Current Report Pursuant
                          to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934



    Date of report (Date of earliest event reported)        September 1, 2004
                                                        ------------------------



                               UNOCAL CORPORATION
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             (Exact name of registrant as specified in its charter)



                                    Delaware
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                 (State or Other Jurisdiction of Incorporation)



    1-8483                                   95-3825062
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(Commission File Number)                (I.R.S. Employer Identification No.)



2141 Rosecrans Avenue, Suite 4000, El Segundo, California         90245
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(Address of Principal Executive Offices)                       (Zip Code)



                                 (310) 726-7600
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              (Registrant's Telephone Number, Including Area Code)

Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions:

|_|  Written communications pursuant to Rule 425 under the Securities Act
|_|  Soliciting material pursuant to Rule 14a-12 under the Exchange Act
|_|  Pre-commencement communications pursuant to Rule 14d-2(b) under the
     Exchange Act
|_|  Pre-commencement communications pursuant to Rule 13e-4(c) under the
     Exchange Act



Item 5.03(a).  Amendments to Articles of Incorporation or Bylaws.

On July 21,  2004,  we  announced  the  appointment  of Mr.  Joseph H. Bryant as
Unocal's  President  and Chief  Operating  Officer  and as a member of  Unocal's
Management  Committee,  effective  September  1, 2004.  In  connection  with Mr.
Bryant's  appointment  to the  Management  Committee,  the Board of Directors of
Unocal  approved the  amendment,  effective  September  1, 2004,  of Article VI,
Section 3 of Unocal's  bylaws to change the quorum  requirement  for  Management
Committee  actions from two members to a majority of the members.  These amended
and restated bylaws are filed as an exhibit under Item 9.01(c) of this report.

Item 9.01(c).  Exhibits.

3.ii.  Bylaws of Unocal Corporation, as amended and effective September 1, 2004.



                                    Signature

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned, thereunto duly authorized.


                                                  UNOCAL CORPORATION
                                                     (Registrant)





Date: September 1, 2004                       By: /s/ JOE D. CECIL
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                                                  Joe D. Cecil
                                                  Vice President and Comptroller