OCCIDENTAL PETROLEUM CORPORATION	10889 WILSHIRE BOULEVARD LOS ANGELES, CALIFORNIA 90024
		TELEPHONE	(310) 208-8800
		FACSIMILE	(310) 443-6690

LINDA S. PETERSON

ASSOCIATE GENERAL COUNSEL

Direct Telephone	(310) 443-6189
Direct Facsimile	(310) 443-6737
Email	linda_peterson@oxy.com

May 7, 2007

Occidental Petroleum Corporation
10889 Wilshire Boulevard
Los Angeles, CA 90024

Re: Occidental Petroleum Corporation
Registration Statement on Form S-8
Occidental Petroleum Corporation
2005 Long-Term Incentive Plan

Ladies and Gentlemen:

I am an Associate General Counsel of Occidental Petroleum Corporation, a Delaware corporation ("Occidental"), and have acted as counsel to Occidental in connection with the preparation of the above-referenced Registration Statement on Form S-8, submitted by Occidental to the Securities and Exchange Commission ("Commission") on May 8, 2007 (the "Registration Statement"). The Registration Statement relates to the registration under the Securities Act of 1933, as amended (the "1933 Act"), of 32,000,000 shares (the "Shares") of Common Stock, par value $.20 per share, of Occidental. The Shares are to be issued in accordance with the Occidental Petroleum Corporation 2005 Long-Term Incentive Plan (the "Plan").

In connection with this opinion, I have examined and am familiar with originals or copies, certified or otherwise identified to my satisfaction, of such records of Occidental and all such agreements, certificates of public officials, certificates of officers or other representatives of Occidental and others and such other documents, certificates and records as I have deemed necessary or appropriate as a basis for the opinions set forth herein, including, without limitation, (i) the Registration Statement (together with the form of prospectus forming a part thereof), (ii) the Restated Certificate of Incorporation and By-laws of Occidental, as amended to date, (iii) copies of certain resolutions adopted by the Board of Directors of Occidental, relating to the adoption of the Plan, the filing of the Registration Statement and any amendments or supplements thereto, and the issuance of the Shares and related matters, (iv) copies of the action adopted at the Annual Meeting of Stockholders approving the amendment of the Plan to increase the number of shares available for issuance and (v) the Plan. In my examination, I have assumed the genuineness of all signatures, the legal capacity of natural persons, the authenticity of all documents submitted to me as originals, the conformity to original documents of all documents submitted to me as certified, conformed or photostatic copies and the authenticity of the originals of such copies. As to any facts material to the opinions expressed herein which I have not independently established or verified, I have relied upon statements and representations of officers and other representatives of Occidental and others.

Occidental Petroleum Corporation
May 8, 2007
Page 2

I am a member of the California and New York Bars and for purposes of this opinion do not hold myself out as an expert on, nor do I express any opinion as to, the laws of any jurisdiction other than the General Corporation Law of the State of Delaware.

Based upon and subject to the foregoing, I am of the opinion that the Shares have been duly authorized and, when issued and paid for in accordance with the Plan, will be validly issued, fully paid and nonassessable.

This opinion is delivered in accordance with the requirements of Item 601(b)(5) of Regulation S-K under the 1933 Act and is furnished to you solely for your benefit in connection with the filing of the Registration Statement and is not to be used, circulated, quoted or otherwise referred to for any other purpose without my prior written consent. I hereby consent to the filing of this opinion with the Commission as Exhibit 5 to the Registration Statement. I also consent to the reference to me under the heading “Legal Matters” in the Registration Statement. In giving this consent, I do not thereby admit that I am included in the category of persons whose consent is required under Section 7 of the 1933 Act or the rules and regulations of the Commission promulgated thereunder.

Very truly yours,

/s/ LINDA S. PETERSON

Linda S. Peterson