September 26, 2011

United States Securities and Exchange Commission

Division of Corporation Finance

100 F Street, N.E.

Mail Stop 7010

Washington, DC 20549

Attention:	H. Roger Schwall, Assistant Director
	Suying Li

Re:	Pioneer Natural Resources Company
	Form 10-K for the Year Ended December 31, 2010
	Filed February 25, 2011
	File No. 001-13245

Ladies and Gentlemen:

I am writing to confirm my telephone conversation of September 26, 2011 with Suying Li of the Staff of the Securities and Exchange Commission.  On behalf of Pioneer Natural Resources Company (the “Company”), the Company acknowledges receipt of the letter, dated September 15, 2011, from the Staff in regard to the above-referenced document and intends to submit its responses to that letter by October 14, 2011.

Please direct any questions in connection with this letter to undersigned at 972-969-4054 (direct fax 972-969-3581).

Very truly yours,

/s/ Richard P. Dealy                                      

Richard P. Dealy

Executive Vice President and

Chief Financial Officer