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): December 19, 2005




                        Pioneer Natural Resources Company
             -----------------------------------------------------
             (Exact name of Registrant as specified in its charter)



          Delaware                    1-13245                 75-2702753
----------------------------        ------------         -------------------
(State or other jurisdiction        (Commission           (I.R.S. Employer
     of incorporation)              File Number)         Identification No.)



5205 N. O'Connor Blvd., Suite 900, Irving, Texas                75039
------------------------------------------------              ----------
   (Address of principal executive offices)                   (Zip Code)


                                 (972) 444-9001
              ----------------------------------------------------
              (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:

| | Written communications pursuant to Rule 425 under the Securities Act (17 CFR
    230.425)
| | Soliciting material pursuant to Rule  14a-12 under  the Exchange Act (17 CFR
    240.14a-12)
| | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
    Act (17 CFR 240.14d-2(b))
| | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
    Act (17 CFR 240.13e-4(c))








                        PIONEER NATURAL RESOURCES COMPANY

                                TABLE OF CONTENTS


                                                                         Page

Item 5.02.  Departure of Directors or Principal Officers; Election
            of Directors; Appointment of Principal Officers...........    3

Item 9.01.  Financial Statements and Exhibits.........................    3

            (d)   Exhibits............................................    3

Signature.............................................................    4

Exhibit Index.........................................................    5






                                       2








                        PIONEER NATURAL RESOURCES COMPANY



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

     On December 19, 2005,  Pioneer  Natural  Resources  Company (the "Company")
issued a news  release  that is  attached  hereto as exhibit  99.1.  In the news
release, the Company announced that James L. Houghton has retired from its board
of  directors,  effective  December  19,  2005,  having  reached  the  Company's
mandatory retirement age of 75 for board members.

Item 9.01.  Financial Statements and Exhibits

       (d)  Exhibits

            99.1  News Release dated December 19, 2005.




                                        3





                       PIONEER NATURAL RESOURCES COMPANY

                               S I G N A T U R E


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.

                                PIONEER NATURAL RESOURCES COMPANY



Date:  December 20, 2005        By: /s/ Darin G. Holderness
                                    --------------------------------------
                                    Darin G. Holderness
                                    Vice President and Chief Accounting Officer




                                        4



                       PIONEER NATURAL RESOURCES COMPANY

                                 EXHIBIT INDEX



Exhibit No.                  Description
-----------                  -----------
  99.1(a)                    News Release dated December 19, 2005.


-------------
(a) filed herewith




                                        5