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)        August 12, 2002
                                                        ------------------------



                               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)



Item 9.      Regulation FD Disclosure.

         On August 12, 2002, Unocal Corporation (the "Company") filed with the
Securities and Exchange Commission (the "Commission") its Quarterly Report on
Form 10-Q for the quarterly period ended June 30, 2002. Pursuant to Section 906
of the Sarbanes-Oxley Act of 2002, the Company submitted the following
certifications with respect to the Form 10-Q by Charles R. Williamson, its
Chairman of the Board and Chief Executive Officer, and Terry G. Dallas, its
Executive Vice President and Chief Financial Officer:

                    CERTIFICATION OF CHIEF EXECUTIVE OFFICER

I, Charles R. Williamson, Chairman of the Board and Chief Executive Officer of
Unocal Corporation (the "Company"), certify, pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that, to my knowledge:

     (1)  the  Quarterly  Report on Form 10-Q of the Company  for the  quarterly
          period ended June 30, 2002 (the  "Report"),  fully  complies  with the
          requirements of Section 13(a) or 15(d) of the Securities  Exchange Act
          of 1934 (15 U.S.C. 78m or 78o(d)); and

     (2)  the  information  contained  in the  Report  fairly  presents,  in all
          material respects,  the financial  condition and results of operations
          of the Company.

Dated:  August 12, 2002

                                                     /s/CHARLES R. WILLIAMSON
                                                     ---------------------------
                                                     Charles R. Williamson


                    CERTIFICATION OF CHIEF FINANCIAL OFFICER

I, Terry G. Dallas, Executive Vice President and Chief Financial Officer of
Unocal Corporation (the "Company"), certify, pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that to my knowledge:

     (1)  the  Quarterly  Report on Form 10-Q of the Company  for the  quarterly
          period ended June 30, 2002 (the  "Report"),  fully  complies  with the
          requirements of Section 13(a) or 15(d) of the Securities  Exchange Act
          of 1934 (15 U.S.C. 78m or 78o(d)); and

     (2)  the  information  contained  in the  Report  fairly  presents,  in all
          material respects,  the financial  condition and results of operations
          of the Company.

Dated:  August 12, 2002

                                                     /s/TERRY G. DALLAS
                                                     ---------------------------
                                                     Terry G. Dallas

                     =======================================

                                      -1-



Messrs.  Williamson and Dallas also signed and filed with the Commission the
following sworn  statements  regarding the accuracy of the Company's recent
filings with the Commission, as required by the Commission's Order No. 4-460:


   Statement Under Oath of Principal Executive Officer and Principal Financial
              Officer Regarding Facts and Circumstances Relating to
                              Exchange Act Filings

I, Charles R. Williamson, Chief Executive Officer (Principal Executive Officer)
of Unocal Corporation, state and attest that:

     (1)  To the  best of my  knowledge,  based  upon a  review  of the  covered
          reports  of  Unocal   Corporation,   and,   except  as   corrected  or
          supplemented in a subsequent covered report:

          o    No covered  report  contained  an untrue  statement of a material
               fact as of the end of the period  covered  by such  report (or in
               the case of a report on Form 8-K or definitive  proxy  materials,
               as of the date on which it was  filed);  and
          o    No covered  report omitted to state a material fact necessary to
               make the statements in the covered report, in light of the
               circumstances  under which they  were  made,  not  misleading as
               of the  end of the  period covered by such report (or in the case
               of a report on Form 8-K or definitive  proxy  materials,  as of
               the  date  on  which  it was filed).

     (2)  I have  reviewed the  contents of this  statement  with the  Company's
          Accounting and Auditing Committee.

     (3)  In this statement  under oath,  each of the following,  if filed on or
          before the date of this statement, is a "covered report":

          o    Report on Form 10-K for the year  2001 of Unocal  Corporation;
          o    all  reports  on Form  10-Q, all  reports  on Form 8-K and all
               definitive proxy materials of Unocal  Corporation  filed with the
               Commission  subsequent to the filing of the Form 10-K  identified
               above; and
          o    any amendments to any of the foregoing.




/s/ CHARLES R. WILLIAMSON                   State of California
--------------------------
Charles R. Williamson
August 12, 2002                             County of Los Angeles

                                            Subscribed and sworn to
                                            before me this 12th day of
                                            August 2002.

LAWANNA JOHNSON                             /s/ LAWANNA JOHNSON
Commission #1319964                         ------------------------------------
Notary Public - California                   Notary Public
  Los Angeles County
My Comm. Expires Sep 4, 2005                 My Commission Expires:     9/4/05

                                      -2-



   Statement Under Oath of Principal Executive Officer and Principal Financial
              Officer Regarding Facts and Circumstances Relating to
                              Exchange Act Filings

I, Terry G. Dallas, Executive Vice President & Chief Financial Officer of Unocal
Corporation, state and attest that:

     (1)  To the  best of my  knowledge,  based  upon a  review  of the  covered
          reports  of  Unocal   Corporation,   and,   except  as   corrected  or
          supplemented in a subsequent covered report:

          o    No covered  report  contained  an untrue  statement of a material
               fact as of the end of the period  covered  by such  report (or in
               the case of a report on Form 8-K or definitive  proxy  materials,
               as of the date on which it was  filed);  and
          o    No covered  report omitted to state a material fact necessary to
               make the statements in the covered report, in light of the
               circumstances  under which they  were  made,  not  misleading as
               of the  end of the  period covered by such report (or in the case
               of a report on Form 8-K or definitive  proxy  materials,  as of
               the  date  on  which  it was filed).

     (2)  I have  reviewed the  contents of this  statement  with the  Company's
          Accounting and Auditing Committee.

     (3)  In this statement  under oath,  each of the following,  if filed on or
          before the date of this statement, is a "covered report":

          o    Report on Form 10-K for the year 2001 of Unocal Corporation;
          o    all  reports  on Form  10-Q,  all  reports  on  Form  8-K and all
               definitive proxy materials of Unocal  Corporation  filed with the
               Commission  subsequent to the filing of the Form 10-K  identified
               above; and
          o    any amendments to any of the foregoing.




/s/ TERRY G. DALLAS                         State of California
--------------------
Terry G. Dallas
August 12, 2002                             County of Los Angeles

                                            Subscribed and sworn to
                                            before me this 12th day of
                                            August 2002.

LAWANNA JOHNSON                             /s/ LAWANNA JOHNSON
Commission #1319964                         ------------------------------------
Notary Public - California                   Notary Public
  Los Angeles County
My Comm. Expires Sep 4, 2005                 My Commission Expires:     9/4/05

                     =======================================

                                      -3-



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:  August 13, 2002                      By:  /s/ JOHN A. BRIFFETT
                                            --------------------------
                                                 John A. Briffett
                                                 Assistant Comptroller



                                      -4-