8-K

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):   March 21, 2005

Tesoro Corporation

(Exact name of registrant as specified in its charter)

Delaware
(State or other jurisdiction	1-3473	95-0862768
of incorporation)	(Commission File Number)	(IRS Employer Identification No.)
300 Concord Plaza Drive
San Antonio, Texas		78216-6999
(Address of principal executive offices)		(Zip Code)

(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.):

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

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

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR240.14d-2(b))

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

TABLE OF CONTENTS

Press Release

Item 5.02 Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers.

On March 23, 2005 Tesoro Corporation (“Tesoro” or the “Company”) issued a press release (the “Press Release”) announcing that Michael E. Wiley had been elected to the Company’s Board of Directors. In connection with Mr. Wiley’s election, Tesoro’s Board of Directors increased the size of the Board from seven to eight members. Mr. Wiley’s election and the increase in the size of the Board were each effective as of March 21, 2005 and his term as director will continue until the 2005 annual meeting to be held on May 4, 2005 or until his successor is elected and qualified. Mr. Wiley will stand for reelection at the 2005 annual meeting. The Press Release is filed as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits.

(c)	Exhibits.
99.1	Press Release issued on March 23, 2005 by Tesoro Corporation.

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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:    March 23, 2005

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

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Index to Exhibits

Exhibit Number	Description
99.1	Press Release issued on March 23, 2005 by Tesoro Corporation.

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EX-99.1

EXHIBIT 99.1

FOR IMMEDIATE RELEASE

Contact:

Investors:
A. Pierre Dubois
Investor Relations, (210) 283-2164

Media:
Tara Ford Payne
Public Relations, (210) 283-2676

Michael E. Wiley Elected to Tesoro’s Board of Directors

SAN ANTONIO – March 23, 2005 – Tesoro Corporation (NYSE:TSO) announced today that the size of Tesoro’s board has been increased from seven to eight members and Michael E. Wiley has been elected to the company’s board of directors effective March 21, 2005.

Wiley, 54, has thirty-three years experience in the energy industry. Most recently he served as Chairman of the Board and Chief Executive Officer of Baker Hughes Incorporated, an oilfield services company. Prior to Baker Hughes, Mr. Wiley was President and Chief Operating Officer of Atlantic Richfield Company, an integrated energy company. He also served as Chairman, President and Chief Executive Officer of Vastar Resources, Inc., an independent oil and gas company.

Mr. Wiley is a director of Spinnaker Exploration, Bill Barrett Corporation and Post Oak Bank, NA, a trustee of the University of Tulsa and a member of the National Petroleum Council. He also serves on the Advisory Board of Riverstone Holdings LLC.

“We are extremely pleased to have someone with Michael Wiley’s extensive experience join our board,” said Bruce A. Smith, Tesoro’s Chairman and CEO. His strong background in the energy sector will be a tremendous asset to Tesoro’s board of directors.”

Tesoro Corporation, a Fortune 500 Company, is an independent refiner and marketer of petroleum products. Tesoro operates six refineries in the Western United States with a combined capacity of nearly 560,000 barrels per day. Tesoro’s retail-marketing system includes over 500 branded retail stations, of which more than 200 are company operated under the Tesoro® and Mirastar® brands.

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