As filed with the Securities and Exchange Commission on August 10, 2006
                                                     Registration No. 333-_____
-------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                -----------------
                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                                -----------------

                        PIONEER NATURAL RESOURCES COMPANY
             (Exact Name of Registrant as Specified in Its Charter)

             Delaware                                      75-2702753
  (State or Other Jurisdiction of                       (I.R.S. Employer
  Incorporation or Organization)                      Identification No.)

                          5205 North O'Connor Boulevard
                                    Suite 200
                               Irving, Texas 75039
          (Address of Principal Executive Offices, Including Zip Code)
                              --------------------
           PIONEER NATURAL RESOURCES COMPANY LONG-TERM INCENTIVE PLAN
                            (Full Title of the Plan)

                                  Mark S. Berg
                        Pioneer Natural Resources Company
                          5205 North O'Connor Boulevard
                                    Suite 200
                               Irving, Texas 75039
                                 (972) 444-9001

            (Name, Address and Telephone Number of Agent For Service)
                                    copy to:
                                Robert L. Kimball
                             Vinson & Elkins L.L.P.
                          2001 Ross Avenue, Suite 3700
                            Dallas, Texas 75201-2975
                                 (214) 220-7700



                         CALCULATION OF REGISTRATION FEE
=========================================================================================================
                                                     Proposed            Proposed
  Title of securities             Amount to be    maximum offering   maximum aggregate      Amount of
   to be registered              registered (1)   price per share     offering price    registration fee
------------------------------- ---------------- ------------------ ------------------- -----------------

                                                                            
Common stock, $0.01 par
value per share..........        200,000 shares     $ 44.605 (2)     $8,921,000.00 (2)      $ 954.55
------------------------------- ---------------- ------------------ ------------------- -----------------

Rights to purchase shares of           (3)               (3)                (3)                (3)
Series A Junior Participating
Preferred Stock
------------------------------- ---------------- ------------------ ------------------- -----------------


(1)  Pursuant to Rule 416 under the  Securities  Act of 1933, as amended,  there
     are also being  registered  such  additional  and  indeterminate  number of
     shares of common stock of Pioneer Natural  Resources Company and associated
     rights to purchase shares of Series A Junior Participating  Preferred Stock
     as may become issuable  because of changes  resulting from stock dividends,
     stock  splits  and  similar  changes  and  pursuant  to  the   antidilution
     provisions of the Long Term Incentive Plan.

(2)  Estimated  solely for purposes of calculating the  registration fee and, in
     accordance  with Rules  457(h)(1)  and 457(c) under the  Securities  Act of
     1933, as amended.  The price for 200,000 shares being registered  hereby is
     based on a price of $44.605, the average of the high and low trading prices
     of the common stock of Pioneer  Natural  Resources  Company on the New York
     Stock Exchange on August 7, 2006.

(3)  These  rights are  initially  carried and traded  with the common  stock of
     Pioneer Natural Resources  Company.  Value  attributable to such rights, if
     any, is reflected in the market price of the common stock.










                                     PART II
               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

     This registration statement  ("Registration  Statement") is being filed, in
accordance with General Instruction E to Form S-8, to register additional shares
of common stock, $0.01 par value per share, of Pioneer Natural Resources Company
(the "Company" or "Registrant") that may be issued under the Company's Long-Term
Incentive  Plan  (as  amended,  the  "Plan").  The  contents  of  the  Company's
registration  statement  on Form S-8 filed on  September  8, 1997  (File  Number
333-35087), as amended on May 16, 2002 (File Number 333-88438),  relating to the
Plan are hereby incorporated by reference to this Registration Statement.

Exhibits.

     Unless  otherwise  indicated  below as being  incorporated  by reference to
another filing of the Company with the Securities and Exchange  Commission  (the
"Commission"), each of the following exhibits is filed herewith:

      3.1      Amended and Restated  Certificate of Incorporation of the Company
               (incorporated  by reference  to  Exhibit  3.1  to  the  Company's
               Registration Statement on Form S-4 (No. 333-26951) filed with the
               Commission on June 26, 1997).

      3.2      Amended and  Restated  Bylaws  of the  Company  (incorporated  by
               reference  to Exhibit 3.2 to the  Company's Annual Report on Form
               10-K (No. 001-13245)  filed with the  Commission on  February 17,
               2006).

      4.1      Pioneer  Natural  Resources   Company  Long-Term  Incentive  Plan
               (incorporated  by  reference  to  Exhibit  4.1  to the  Company's
               Registration  Statement on  Form S-8  (File No. 333-35087)  filed
               with the Commission on September 8, 1997).

      4.1.1    First  Amendment to  Pioneer Natural Resources Company  Long-Term
               Incentive Plan, effective as of  November 23, 1998  (incorporated
               by reference  to Exhibit 10.72 to  the Company's Annual Report on
               Form 10-K  for  the  period  ended  December 31,  1999  (File No.
               001-13245) filed with the Commission on March 2, 2000).

      4.1.2    Amendment  No. 2 to  Pioneer Natural Resources Company  Long-Term
               Incentive Plan,  effective  as of  May 20, 1999  (incorporated by
               reference to Exhibit 10.73 to the Company's Annual Report on Form
               10-K for the period  ended December 31, 1999 (File No. 001-13245)
               filed with the Commission on March 2, 2000).

      4.1.3    Amendment  No. 3 to  Pioneer Natural Resources Company  Long-Term
               Incentive Plan, effective as of  February 17, 2000  (incorporated
               by reference  to Exhibit 10.76 to the  Company's Annual Report on
               Form 10-K  for  the  period  ended  December 31,  1999  (File No.
               001-13245) filed with the Commission on March 2, 2000).

      4.1.4    Amendment  No. 4 to Pioneer  Natural Resources Company  Long-Term
               Incentive Plan,  effective as of November 20, 2003  (incorporated
               by reference to Exhibit 10.5 to the Company's Quarterly Report on
               Form  10-Q  for  the  period  ended  March  31,  2005  (File  No.
               001-13245) filed with the Commission on May 6, 2005).

      4.1.5    Amendment  No. 5 to  Pioneer Natural Resources Company  Long-Term
               Incentive Plan,  effective  as of  May 12, 2004  (incorporated by
               reference to  Exhibit 10.6  to the  Company's Quarterly Report on
               Form  10-Q  for  the  period  ended  March  31,  2005  (File  No.
               001-13245) filed with the Commission on May 6, 2005).

      4.1.6    Amendment  No. 6 to  Pioneer Natural Resources Company  Long-Term
               Incentive Plan,  effective as of December 17, 2004  (incorporated
               by reference to Exhibit 10.7 to the Company's Quarterly Report on
               Form  10-Q  for  the  period  ended  March  31,  2005  (File  No.
               001-13245) filed with the Commission on May 6, 2005).

                                      II-1






      5.1      Opinion of Vinson & Elkins L.L.P.

      23.1     Consent of Ernst & Young LLP.

      23.2     Consent of Netherland, Sewell & Associates, Inc.

      23.3     Consent of Vinson & Elkins L.L.P. (included  in the opinion filed
               as Exhibit  5.1 to this  registration statement).

      24.1     Power of  Attorney  (included  on the  signature  pages  of  this
               registration statement).


                                      II-2






                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, as amended (the
"Securities  Act"), the 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  Registration  Statement  to be signed  on its  behalf by the
undersigned,  thereunto duly authorized,  in the City of Irving, State of Texas,
on August 10, 2006.

                                         PIONEER NATURAL RESOURCES COMPANY


                                         By: /s/ Scott D. Sheffield
                                             --------------------------------
                                                  Scott D. Sheffield
                                                  Chairman of the Board and
                                                  Chief Executive Officer

     KNOW ALL MEN BY THESE PRESENTS,  that each person whose  signature  appears
below  constitutes  and appoints Mark S. Berg and Richard P. Dealy,  and each of
them,  his true and  lawful  attorneys-in-fact  and  agents,  with full power of
substitution  and  resubstitution,  for him and in his name, place and stead, in
any and all  capacities,  to sign  any  and all  amendments  (including  pre-and
post-effective  amendments)  to this  Registration  Statement and any additional
registration  statement pursuant to Rule 462(b) under the Securities Act, and to
file the same with all  exhibits  thereto,  and other  documents  in  connection
therewith, with the Commission, granting unto said attorneys-in-fact and agents,
and each of them,  full power and authority to do and perform each and every act
and thing  requisite  and  necessary  to be done,  as fully to all  intents  and
purposes as he might or could do in person,  hereby ratifying and confirming all
that  said  attorneys-in-fact  and  agents,  or any  of  them,  or his or  their
substitute or substitutes may lawfully do or cause to be done by virtue hereof.

     Pursuant to the  requirements  of the  Securities  Act,  this  registration
statement has been signed by the following  persons in the capacities and on the
date indicated.

       Signature                           Title                     Date
       ---------                           -----                     ----

/s/ Scott D. Sheffield
--------------------------
    Scott D. Sheffield           Chairman of the Board and       August 10, 2006
                                  Chief Executive Officer
                               (Principal Executive Officer)

/s/ Richard P. Dealy
--------------------------
    Richard P. Dealy            Executive Vice President and     August 10, 2006
                                  Chief Financial Officer
                               (Principal Financial Officer)

/s/ Darin G. Holderness
--------------------------
    Darin G. Holderness               Vice President and         August 10, 2006
                                  Chief Accounting Officer
                               (Principal Accounting Officer)

/s/ James R. Baroffio
--------------------------
    James R. Baroffio                      Director              August 10, 2006

/s/ Edison C. Buchanan
--------------------------
    Edison C. Buchanan                     Director              August 9, 2006


                                      II-3





/s/ R. Hartwell Gardner
--------------------------
    R. Hartwell Gardner                    Director              August 10, 2006

/s/ Linda K. Lawson
--------------------------
    Linda K. Lawson                        Director              August 10, 2006

/s/ Andrew D. Lundquist
--------------------------
    Andrew D. Lundquist                    Director              August 3, 2006

/s/ Charles E. Ramsey, Jr.
--------------------------
    Charles E. Ramsey, Jr.                 Director              August 10, 2006

/s/ Frank A. Risch
--------------------------
    Frank A. Risch                         Director              August 10, 2006

/s/ Mark S. Sexton
--------------------------
    Mark S. Sexton                         Director              August 10, 2006

/s/ Robert A. Solberg
--------------------------
    Robert A. Solberg                      Director              August 8, 2006

/s/ Jim A. Watson
--------------------------
    Jim A. Watson                          Director              August 2, 2006



                                      II-4







                                INDEX TO EXHIBITS

Exhibit
Number        Description

   3.1        Amended and Restated  Certificate of  Incorporation of the Company
              (incorporated  by  reference  to  Exhibit  3.1  to  the  Company's
              Registration  Statement on Form S-4 (No. 333-26951) filed with the
              Commission on June 26, 1997).

   3.2        Amended  and  Restated  Bylaws  of  the Company  (incorporated  by
              reference  to Exhibit 3.2  to the  Company's Annual Report on Form
              10-K (No. 001-13245)  filed  with the  Commission on  February 17,
              2006).

   4.1        Pioneer  Natural  Resources  Company   Long-Term   Incentive  Plan
              (incorporated  by  reference  to  Exhibit  4.1  to  the  Company's
              Registration Statement on Form S-8 (File No. 333-35087) filed with
              the Commission on September 8, 1997).

   4.1.1      First  Amendment to  Pioneer Natural  Resources Company  Long-Term
              Incentive Plan, effective as of November 23, 1998 (incorporated by
              reference to Exhibit 10.72 to the  Company's Annual Report on Form
              10-K for the  period  ended  December 31, 1999  (File No. 1-13245)
              filed with the Commission on March 2, 2000).

   4.1.2      Amendment  No. 2 to  Pioneer Natural  Resources Company  Long-Term
              Incentive Plan,  effective  as of  May 20, 1999  (incorporated  by
              reference to Exhibit 10.73 to  the Company's Annual Report on Form
              10-K for the  period ended  December 31, 1999  (File No.  1-13245)
              filed with the Commission on March 2, 2000).

   4.1.3      Amendment  No. 3 to  Pioneer Natural  Resources Company  Long-Term
              Incentive Plan, effective as of February 17, 2000 (incorporated by
              reference to Exhibit 10.76 to the  Company's Annual Report on Form
              10-K for the  period  ended  December 31, 1999  (File No. 1-13245)
              filed with the Commission on March 2, 2000).

   4.1.4      Amendment  No. 4 to  Pioneer Natural  Resources Company  Long-Term
              Incentive Plan, effective as of November 20, 2003 (incorporated by
              reference to  Exhibit  10.5  to the Company's  Quarterly Report on
              Form 10-Q for the period ended March 31, 2005 (File No. 001-13245)
              filed with the Commission on May 6, 2005).

   4.1.5      Amendment  No. 5 to  Pioneer Natural  Resources Company  Long-Term
              Incentive  Plan,  effective  as of  May 12, 2004  (incorporated by
              reference to  Exhibit 10.6  to the  Company's  Quarterly Report on
              Form 10-Q for the period ended March 31, 2005 (File No. 001-13245)
              filed with the Commission on May 6, 2005).

   4.1.6      Amendment  No. 6 to  Pioneer Natural  Resources Company  Long-Term
              Incentive Plan, effective as of December 17, 2004 (incorporated by
              reference to  Exhibit 10.7  to the  Company's  Quarterly Report on
              Form 10-Q for the period ended March 31, 2005 (File No. 001-13245)
              filed with the Commission on May 6, 2005).

   5.1        Opinion of Vinson & Elkins L.L.P.*

   23.1       Consent of Ernst & Young LLP.*

   23.2       Consent of Netherland, Sewell & Associates, Inc.*






   23.3       Consent of Vinson & Elkins L.L.P.  (included in the  opinion filed
              as Exhibit 5.1 to this registration statement).*

   24.1       Power of  Attorney  (included  on  the  signature  pages  of  this
              registration statement).*

*filed herewith.