As filed with the Securities and Exchange Commission on December 15, 2006
                                     Securities Act Registration No. 333-138762



                     U.S. SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM N-14

             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

Pre-effective Amendment No.  1 [X]       Post-effective Amendment No.  __  [ ]
                        (Check appropriate box or boxes)

                              AIM INVESTMENT FUNDS
               (Exact Name of Registrant as Specified in Charter)

                                11 Greenway Plaza
                                    Suite 100
                                Houston, TX 77046
                    (Address of Principal Executive Offices)

                  Registrant's Telephone Number: (713) 626-1919

Name and Address of Agent for Service:               Copy to:

   PETER A. DAVIDSON, ESQUIRE                 PAUL W. SCOTT, ESQUIRE
      A I M Advisors, Inc.            Ballard Spahr Andrews & Ingersoll, LLP
       11 Greenway Plaza                        1225 17th Street
          Suite 100                                Suite 2300
       Houston, TX 77046                        Denver, CO 80202

         Approximate Date of Proposed Public Offering: As soon as practicable
after the Registration Statement becomes effective under the Securities Act of
1933.

         The Registrant hereby amends this Registration Statement on such date
or dates as may be necessary to delay its effective date until the Registrant
shall file a further amendment which specifically states this Registration
Statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933 or until the Registration Statement shall become
effective on such dates as the Commission, acting pursuant to said Section (a),
may determine.

         The title of the securities being registered are Class A, B and C
shares of AIM Global Health Care Fund. No filing fee is due in reliance on
Section 24(f) of the Investment Company Act of 1940.



                       Contents of Registration Statement

Cover Page

Contents of Registration Statement

Combined Proxy Statement/Prospectus for the reorganization of AIM Advantage
Health Sciences Fund (Class A, Class B, and Class C shares) into AIM Global
Health Care Fund (Class A, Class B, and Class C shares) - incorporated by
reference to the Registrant's Registration Statement on Form N-14 filed on
November 16, 2006 - SEC Accession No. 0000950129-06-009754.

Statement of Additional Information relating to the reorganization of AIM
Advantage Health Sciences Fund - incorporated by reference to the Registrant's
Registration Statement on Form N-14 filed on November 16, 2006 - SEC Accession
No. 0000950129-06-009754.

Part C - incorporated by reference to the Registrant's Registration Statement on
Form N-14 filed on November 16, 2006 - SEC Accession No. 0000950129-06-009754.

Signature Page

The sole purpose of this filing is to delay the effective date of the
Registrant's Registration Statement on Form N-14 filed with the Securities and
Exchange Commission on November 16, 2006, in accordance with Rule 473(a) under
the Securities Act of 1933.



                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, as amended,
the Registrant has duly caused this Amendment to its Registration Statement on
Form N-14 to be signed on its behalf by the undersigned, thereto duly
authorized, in the City of Houston, State of Texas, on the 15th day of December,
2006.

                                      REGISTRANT:   AIM INVESTMENT FUNDS

                                           By:   /s/ PHILIP A. TAYLOR
                                               --------------------------------
                                                  Philip A. Taylor, President

         Pursuant to the requirements of the Securities Act of 1933, this
Amendment to the Registration Statement on Form N-14 has been signed below by
the following persons in the capacities and on the dates indicated.




                  SIGNATURES                                            TITLE                             DATE
                                                                                              
              /s/ Philip A. Taylor
         -----------------------------------                     Trustee & President
              (Philip A. Taylor)                            (Principal Executive Officer)           December 15, 2006

              /s/ Bob R. Baker*                                        Trustee                      December 15, 2006
         -----------------------------------
                 (Bob R. Baker)

              /s/ Frank S. Bayley*                                     Trustee                      December 15, 2006
         -----------------------------------
                (Frank S. Bayley)

              /s/ James T. Bunch*                                      Trustee                      December 15, 2006
         -----------------------------------
                (James T. Bunch)

              /s/ Bruce L. Crockett*                               Chair & Trustee                  December 15, 2006
         -----------------------------------
               (Bruce L. Crockett)

              /s/ Albert R. Dowden*                                    Trustee                      December 15, 2006
         -----------------------------------
               (Albert R. Dowden)

              /s/ Jack M. Fields*                                      Trustee                      December 15, 2006
         -----------------------------------
                (Jack M. Fields)

              /s/ Carl Frischling*                                     Trustee                      December 15, 2006
         -----------------------------------
                (Carl Frischling)

              /s/ Robert H. Graham*                                    Trustee                      December 15, 2006
         -----------------------------------
                (Robert H. Graham)

              /s/ Prema Mathai-Davis*                                  Trustee                      December 15, 2006
         -----------------------------------
              (Prema Mathai-Davis)

              /s/ Lewis F. Pennock*                                    Trustee                      December 15, 2006
         -----------------------------------
              (Lewis F. Pennock)

              /s/ Ruth H. Quigley*                                     Trustee                      December 15, 2006
         -----------------------------------
               (Ruth H. Quigley)







                                                                                             
              /s/ Larry Soll*                                          Trustee                     December 15, 2006
         -----------------------------------
                  (Larry Soll)

              /s/ Raymond Stickel, Jr.*                                Trustee                     December 15, 2006
         -----------------------------------
            (Raymond Stickel, Jr.)

                                                             Vice President & Treasurer            December 15, 2006
              /s/ Sidney M. Dilgren                           (Principal Financial and
         -----------------------------------                     Accounting Officer)
               (Sidney M. Dilgren)

  *By         Philip A. Taylor                                                                     December 15, 2006
         -----------------------------------
               Philip A. Taylor
               Attorney-in-Fact


* Philip A. Taylor, pursuant to powers of attorney filed in Registrant's
  Registration Statement on Form N-14 on November 16, 2006.