UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 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): May 9, 2005


                               Tesoro Corporation
             (Exact name of registrant as specified in its charter)



          Delaware                      1-3473                    95-0862768
(State or other jurisdiction   (Commission File Number)         (IRS Employer
      of incorporation)                                      Identification No.)


         300 Concord Plaza Drive                                  78216-6999
            San Antonio, Texas                                    (Zip Code)
(Address of principal executive offices)


                                 (210) 828-8484
              (Registrant's telephone number, including area code)


                                 Not Applicable
          (Former name or former address, if changed since last report)


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 (see General Instruction A.2.):

[ ]  Written  communications  pursuant to Rule 425 under the  Securities Act (17
     CFR 230.425)

[ ]  Soliciting  material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
     240.14a-12)

[ ]  Pre-commencement   communications  pursuant  to  Rule  14d-2(b)  under  the
     Exchange Act (17 CFR 240.14d-2(b))

[ ]  Pre-commencement   communications  pursuant  to  Rule  13e-4(c)  under  the
     Exchange Act (17 CFR 240.13e-4(c))

Item 2.02 Results of Operations and Financial Condition.

Tesoro  Corporation  (the  "Company") on May 9, 2005 issued a press release (the
"Press Release")  announcing financial results for its first quarter ended March
31, 2005.  The Press Release is filed as Exhibit 99.1 to this Current  Report on
Form 8-K and is incorporated herein by reference.

The information  above is being furnished,  not filed,  pursuant to Item 2.02 of
Form 8-K.  Accordingly,  the  information  in Item 2.02 of this Current  Report,
including the Press  Release,  will not be  incorporated  by reference  into any
registration statement filed by the Company under the Securities Act of 1933, as
amended,  unless  specifically  identified  therein  as  being  incorporated  by
reference.

Item 7.01 Regulation FD Disclosure.

On May 9, 2005,  the Company  announced  in the Press  Release that its Board of
Directors  had declared a quarterly  cash  dividend on common stock of $0.05 per
share payable on June 15, 2005 to  shareholders  of record on June 1, 2005.

The information  above is being furnished,  not filed,  pursuant to Item 7.01 of
Form 8-K.  Accordingly,  the  information  in Item 7.01 of this Current  Report,
including the Press  Release,  will not be  incorporated  by reference  into any
registration statement filed by the Company under the Securities Act of 1933, as
amended,  unless  specifically  identified  therein  as  being  incorporated  by
reference.

Item 9.01 Financial Statements and Exhibits.

         (c) Exhibits.

         99.1     Press Release issued on May 9, 2005 by Tesoro Corporation.





                                       2

                                   SIGNATURES

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 hereunto duly authorized.


Date:    May 9, 2005


                                       TESORO CORPORATION


                                       By:  /s/ GREGORY A. WRIGHT
                                            ------------------------------------
                                            Gregory A. Wright
                                            Executive Vice President
                                            and Chief Financial Officer



















                                       3

                                Index to Exhibits


Exhibit Number                  Description

    99.1              Press Release issued on May 9, 2005 by Tesoro Corporation.



































                                       4