As filed with the Securities and Exchange Commission on April 26, 2005

Registration Nos. 333-116216

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

POST-EFFECTIVE AMENDMENT NO. 1
To
FORM S-8
REGISTRATION STATEMENT
Under
THE SECURITIES ACT OF 1933

ConocoPhillips

2004 Omnibus Stock and Performance Incentive Plan of ConocoPhillips
ConocoPhillips Savings Plan
ConocoPhillips Store Savings Plan
(Full title of the plans)

Stephen F. Gates
Senior Vice President, Legal, and General Counsel
600 North Dairy Ashford
Houston, Texas 77079
(Name and address of agent for service)

(281) 293-1000
(Telephone number, including area code, of agent for service)

Table of Contents

EXPLANATORY NOTE

     ConocoPhillips (the “Registrant”) filed a Registration Statement on Form S-8 on June 4, 2004 (Registration No. 333-116216) (the “Registration Statement”) to register shares of the Registrant’s common stock, par value $.01 per share (the “Common Stock”), for issuance pursuant to the (a) 2004 Omnibus Stock and Performance Incentive Plan of ConocoPhillips; (b) ConocoPhillips Savings Plan; (c) ConocoPhillips Store Savings Plan; and (d) Retirement Savings Plan of ConocoPhillips Company.

     Since the filing of the Registration Statement, the Retirement Savings Plan of ConocoPhillips Company was merged with and into the ConocoPhillips Savings Plan. As a result, the Retirement Savings Plan of ConocoPhillips Company is no longer in existence and annual reports will no longer be filed for such plan. Annual reports will continue to be filed for the ConocoPhillips Savings Plan, the successor plan to the Retirement Savings Plan of ConocoPhillips Company.

     This Post-Effective Amendment No. 1 to the Registration Statement is being filed to transfer the remaining 1,000 shares of Common Stock registered under the Registration Statement and issuable pursuant to the Retirement Savings Plan of ConocoPhillips Company to the ConocoPhillips Savings Plan, into which such plan was merged as described above.

2

SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the undersigned Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Post-Effective Amendment No. 1 to the Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on April 26, 2005.

     Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment No. 1 to the Registration Statement has been signed below by the following persons in the capacities indicated on April ___, 2005.

3

4

     ConocoPhillips Store Savings Plan and ConocoPhillips Savings Plan. Pursuant to the requirements of the Securities Act of 1933, the trustees (or other persons who administer the ConocoPhillips Store Savings Plan and the ConocoPhillips Savings Plan) have duly caused this Post-Effective Amendment No. 1 to the Registration Statement to be signed on behalf of the ConocoPhillips Store Savings Plan and the ConocoPhillips Savings Plan by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on April 26, 2005.

5

EXHIBIT INDEX

6