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                                  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):  JUNE 12, 2006


                                   NEXEN INC.
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             (Exact Name of Registrant as Specified in Its Charter)


                                     CANADA
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                 (State or Other Jurisdiction of Incorporation)


                  1-6702                                 98-6000202
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         (Commission File Number)             (IRS Employer Identification No.)


             801 - 7TH AVENUE S.W.
           CALGARY, ALBERTA, CANADA                              T2P 3P7
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     (Address of Principal Executive Offices)                   (Zip Code)


                                 (403) 699-4000
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              (Registrant's Telephone Number, Including Area Code)


                                 NOT APPLICABLE
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          (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 (SEE General Instruction A.2. below):

     [_] 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))

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ITEM 8.01.    OTHER EVENTS.

        On June 12,  2006,  Nexen  Inc.  mailed to it's  registered  holders a
summary version of Nexen's 2005  Sustainability  Report,  which sets forth our
objectives and performance with respect to integrity, governance,  stakeholder
engagement,  safety and the environment.  A more detailed,  40 page summary of
the  Report  is   available   upon   request  or  can  also  be   accessed  at
www.nexeninc.com.   Nexen  believes  that  our  Sustainability  Report  is  an
important  part of our commitment to help investors see the value that Nexen's
sustainable business practices create for the Company.







                                    SIGNATURE

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report on Form 8-K to be signed on its
behalf by the undersigned, thereunto duly authorized.


Dated: June 12, 2006

                                              NEXEN INC.


                                              By: /s/ Sylvia L. Groves
                                                 ----------------------------
                                                 Name:    Sylvia L. Groves
                                                 Title:   Assistant Secretary