UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                   __________

                                  SCHEDULE 13G



                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                (Amendment No. )*




                                 Mexico Fund Inc
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                    592835102
                                 (CUSIP Number)

                               December 30, 2005
             (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

     |X|  Rule 13d-1(b)
     |_|  Rule 13d-1(c)
     |_|  Rule 13d-1(d)

     * The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

     The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).


-------------------                                            -----------------
CUSIP No. 592823102                    13G                     Page 2 of 8 Pages
-------------------                                            -----------------

--------------------------------------------------------------------------------
   1.     NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

          City of London Investment Group PLC, a company incorporated under the
          laws of England and Wales
--------- ----------------------------------------------------------------------
   2.     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP             (a)  |_|
                                                                       (b)  |_|
--------- ----------------------------------------------------------------------
   3.     SEC USE ONLY

--------- ----------------------------------------------------------------------
   4.     CITIZENSHIP OR PLACE OF ORGANIZATION

          Great Britain
--------------------------------------------------------------------------------
  NUMBER OF
                    5.   SOLE VOTING POWER
   SHARES
                         1,544,380
BENEFICIALLY     ------- -------------------------------------------------------
                    6.   SHARED VOTING POWER
  OWNED BY
                         0
    EACH         ------- -------------------------------------------------------
                    7.   SOLE DISPOSITIVE POWER
  REPORTING
                         1,544,380
   PERSON        ------- -------------------------------------------------------
                    8.   SHARED DISPOSITIVE POWER
    WITH
                         0
--------------------------------------------------------------------------------
   9.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          1,544,380
--------- ----------------------------------------------------------------------
  10.     CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES                  |_|
          CERTAIN SHARES

--------- ----------------------------------------------------------------------
  11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

          8.71%
--------- ----------------------------------------------------------------------
  12.     TYPE OF REPORTING PERSON

          HC
--------------------------------------------------------------------------------

-------------------                                            -----------------
CUSIP No. 592823102                    13G                     Page 3 of 8 Pages
-------------------                                            -----------------

--------------------------------------------------------------------------------
   1.     NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

          City of London Investment Management Company Limited, a company
          incorporated under the laws of England and Wales
--------- ----------------------------------------------------------------------
   2.     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP             (a)  |_|
                                                                       (b)  |_|
--------- ----------------------------------------------------------------------
   3.     SEC USE ONLY

--------- ----------------------------------------------------------------------
   4.     CITIZENSHIP OR PLACE OF ORGANIZATION

          Great Britain
--------------------------------------------------------------------------------
  NUMBER OF
                    5.   SOLE VOTING POWER
   SHARES
                         1,544,380
BENEFICIALLY     ------- -------------------------------------------------------
                    6.   SHARED VOTING POWER
  OWNED BY
                         0
    EACH         ------- -------------------------------------------------------
                    7.   SOLE DISPOSITIVE POWER
  REPORTING
                         1,544,380
   PERSON        ------- -------------------------------------------------------
                    8.   SHARED DISPOSITIVE POWER
    WITH
                         0
--------------------------------------------------------------------------------
   9.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          1,544,380
--------- ----------------------------------------------------------------------
  10.     CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES                  |_|
          CERTAIN SHARES

--------- ----------------------------------------------------------------------
  11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

          8.71%
--------- ----------------------------------------------------------------------
  12.     TYPE OF REPORTING PERSON

          IA
--------------------------------------------------------------------------------

-------------------                                            -----------------
CUSIP No. 592823102                    13G                     Page 4 of 8 Pages
-------------------                                            -----------------

Item 1(a).  Name of Issuer:

            Mexico Fund Inc

Item 1(b).  Address of Issuer's Principal Executive Offices:

            The principal executive offices of the Fund are located at The
            Mexico Fund, 1775 I Street NW, Washington, DC 20006-2401.

Item 2(a).  Name of Person Filing:

            This statement is being filed by City of London Investment Group PLC
            ("CLIG") and City of London Investment Management Company Limited
            ("CLIM," and together with CLIG, the "Reporting Persons").

            The principal business of CLIG is serving as the parent holding
            company for the City of London group of companies, including CLIM.

            CLIM is an emerging markets fund manager which specializes in
            investing in closed-end investment companies and is a registered
            investment adviser under Section 203 of the Investment Advisers Act
            of 1940. CLIM is controlled by CLIG. CLIM is principally engaged in
            the business of providing investment advisory services to various
            public and private investment funds, including The Emerging World
            Fund ("EWF"), a Dublin, Ireland-listed open-ended investment
            company, Emerging Markets Country Fund ("GEM"), a private investment
            fund organized as a Delaware business trust, Investable Emerging
            Markets Country Fund ("IEM"), a private investment fund organized as
            a Delaware business trust, Emerging Free Markets Country Fund
            ("Free"), a private investment fund organized as a Delaware business
            trust, Natural Resource Fund (NAT), a private investment fund
            organized as a Delaware business trust, Global Equity CEF Fund
            (GEF), a private investment fund organized as a Delaware business
            trust, Frontier Emerging Markets Fund (FRONT), a private investment
            fund organized as a Delaware business trust, the Global Emerging
            Markets Equity Yield Fund (YIELD), a private investment fund
            organized as a Delaware business trust, GFM (Institutional) Emerging
            Markets Country Fund ("GFM"), an open-ended fund organized under the
            laws of the Province of Ontario, Tradex Global Equity Fund
            ("Tradex"), an Ontario mutual fund, and nine segregated accounts.

            EWF, GEM, IEM, Free, NAT, GEF, FRONT, YIELD, GFM, and Tradex are
            referred to herein as the "City of London Funds."

            The Shares to which this Schedule 13G relates are owned directly by
            the City of London Funds and segregated accounts.


-------------------                                            -----------------
CUSIP No. 592823102                    13G                     Page 5 of 8 Pages
-------------------                                            -----------------

Item 2(b).  Address of Principal Business Office or, if None, Residence:

            Address for CLIG and CLIM:

            10 Eastcheap
            London EC3M 1LX
            England

Item 2(c).  Citizenship:

            CLIG - Great Britain

            CLIM - Great Britain

Item 2(d).  Title of Class of Securities:

            Common Stock, par value $.001 per share

Item 2(e).  CUSIP Number:

            592835102

Item 3.     If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or
            (c), Check Whether the Person Filing is a:

                  (a)       |_| Broker or dealer registered under Section 15 of
                            the Act (15 U.S.C. 78o).

                  (b)       |_| Bank as defined in Section 3(a)(6) of the Act
                            (15 U.S.C. 78c).

                  (c)       |_| Insurance company as defined in Section 3(a)(19)
                            of the Act (15 U.S.C. 78c).

                  (d)       |_| Investment company registered under Section 8 of
                            the Investment Company Act of 1940 (15 U.S.C.
                            80a-8).

                  (e)       |X| An investment adviser in accordance with Rule
                            13d-1(b)(1)(ii)(E) (for CLIM);

                  (f)       |_| An employee benefit plan or endowment fund in
                            accordance with Rule 13d-1(b)(1)(ii)(F);

                  (g)       |X| A parent holding company or control person in
                            accordance with Rule 13d-1(b)(1)(ii)(G) (for CLIG);


-------------------                                            -----------------
CUSIP No. 592823102                    13G                     Page 6 of 8 Pages
-------------------                                            -----------------

                  (h)       |_| A savings association as defined in Section 3(b)
                            of the Federal Deposit Insurance Act (12 U.S.C.
                            1813);

                  (i)       |_| A church plan that is excluded from the
                            definition of an investment company under Section
                            3(c)(14) of the Investment Company Act (15 U.S.C.
                            80a-3);

                  (j)       |_| Group, in accordance with Rule
                            13d-1(b)(1)(ii)(J).


Item 4.     Ownership.

            For CLIG and CLIM:

                  (a)       Amount beneficially owned:

                            1,544,380

                  (b)       Percent of class:

                            8.71%

                  (c)       Number of shares as to which such person has:

                            (i) Sole power to vote or to direct the vote:
                                1,544,380

                            (ii) Shared power to vote or to direct the vote: 0

                            (iii) Sole power to dispose or to direct the
                                  disposition of: 1,544,380

                            (iv) Shared power to dispose or to direct the
                                 disposition of: 0

Item 5.     Ownership of Five Percent or Less of a Class.

            Not applicable.

Item 6.     Ownership of More than Five Percent on Behalf of Another Person.

            CLIG, as the parent holding company of CLIM, and CLIM, as investment
            adviser to the Funds, have the power to direct the dividends from,
            or the proceeds of the sale of the shares owned by, the Funds. Each
            of the Funds owns less than 5% of the shares.

Item 7.     Identification and Classification of the Subsidiary Which Acquired
            the Security Being Reported on by the Parent Holding Company.

            CLIG is the parent holding company of CLIM. See also Item 3.


-------------------                                            -----------------
CUSIP No. 592823102                    13G                     Page 7 of 8 Pages
-------------------                                            -----------------

Item 8.     Identification and Classification of Members of the Group.

            Not applicable.

            Item 9. Notice of Dissolution of Group.

            Not applicable.

Item 10.    Certification.

            By signing below I certify that, to the best of my knowledge and
            belief, the securities referred to above were acquired and are held
            in the ordinary course of business and were not acquired and are not
            held for the purpose of or with the effect of changing or
            influencing the control of the issuer of the securities and were not
            acquired and are not held in connection with or as a participant in
            any transaction having that purpose or effect.















-------------------                                            -----------------
CUSIP No. 592823102                    13G                     Page 8 of 8 Pages
-------------------                                            -----------------


                                    SIGNATURE

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

     The reporting persons agree that this statement is filed on behalf of each
of them.



Dated: February 3, 2006



                                          CITY OF LONDON INVESTMENT GROUP PLC


                                          By: /s/ Barry M. Olliff
                                              ---------------------------
                                              Name: Barry M. Olliff
                                              Title: Director



                                          CITY OF LONDON INVESTMENT MANAGEMENT
                                          COMPANY LIMITED


                                          By: /s/ Barry M. Olliff
                                              ---------------------------
                                              Name: Barry M. Olliff
                                              Title: Director