UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM 10-K/A

     X  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
        EXCHANGE ACT OF 1934

                   For the fiscal year ended December 31, 2005

                          Commission file number 0-7674

                        First Financial Bankshares, Inc.
             (Exact Name of Registrant as Specified in Its Charter)

           Texas                                                  75-0944023
(State or Other Jurisdiction of                              (I.R.S. Employer
Incorporation or Organization)                               Identification No.)

        400 Pine Street
        Abilene, Texas                                                79601
(Address of Principal Executive Offices)                           (Zip Code)

Registrant's telephone number, including area code:              (325) 627-7155

           Securities registered pursuant to Section 12(b) of the Act:

        Title of Class                      Name of Exchange on Which Registered
        --------------                      ------------------------------------
             None                                            N/A

           Securities registered pursuant to Section 12(g) of the Act:
                    Common Stock, par value $10.00 per share

     Indicate by check mark if the registrant is a well-known  seasoned  issuer,
as defined in Rule 405 of the Securities Act. Yes  No  X

     Indicate by check mark if the  registrant  is not  required to file reports
pursuant to Section 13 or Section 15(d) of the Act. Yes  No  X

     Indicate  by check mark  whether the  registrant  (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during  the  preceding  12 months  (or for such  shorter  period  that the
registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days. Yes X  No

     Indicate by check mark if disclosure of delinquent  filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's  knowledge,  in definitive proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K.

     Indicate by check mark whether the registrant is a large accelerated filer,
an accelerated  filer,  or a  non-accelerated  filer.
Large accelerated filer       Accelerated filer X      Non-accelerated filer

     Indicate  by check mark  whether  the  registrant  is a shell  company  (as
defined in Rule 12b-2 of the Act). Yes  No  X

     As of June  30,  2005,  the  last  business  day of the  registrant's  most
recently  completed second fiscal quarter,  the aggregate market value of voting
and non-voting common stock held by non-affiliates was $623,000,000.

     As of February  20,  2006,  there were  20,714,826  shares of Common  Stock
outstanding.

                       Documents Incorporated by Reference
     Certain  information called for by Part III is incorporated by reference to
the Proxy Statement for the 2006 Annual Meeting of our shareholders,  which will
be filed with the  Securities  and Exchange  Commission  not later than 120 days
after December 31, 2005.



                                EXPLANATORY NOTE
This Form 10-K/A has been filed solely to provide  corrected  exhibits  31.1 and
31.2 to the Company's Annual Report on Form 10-K filed February 28, 2006.










                  [Remainder of page left blank intentionally]



     SIGNATURES

     Pursuant  to the  requirements  of  Section  13 or 15(d) of the  Securities
Exchange Act of 1934, the Registrant has duly caused this amendment to be signed
on its behalf by the undersigned, thereunto duly authorized.

                         FIRST FINANCIAL BANKSHARES, INC.

Date:  March 2, 2006     By: /s/ J. Bruce Hildebrand
                            ------------------------------------------------
                            J. Bruce Hildebrand
                            Executive Vice President and Chief Financial Officer

     Pursuant to the  requirements of the Securities  Exchange Act of 1934, this
amendment  has been  signed  below by the  following  persons  on  behalf of the
registrant and in the capacities and on the dates indicated.




                        Name                                          Title                            Date
                        ----                                          -----                            ----

                                                                                            
    *                                                  Chairman of the Board and Director         March 2, 2006
-----------------------------------------------
               Kenneth T. Murphy
/s/ F. SCOTT DUESER                                    President, Chief Executive Officer         March 2, 2006
-----------------------------------------------                   and Director
                F. Scott Dueser                           (Principal Executive Officer)

/s/ J. BRUCE HILDEBRAND                                Executive Vice President and Chief         March 2, 2006
-----------------------------------------------                 Financial Officer
              J. Bruce Hildebrand                       (Principal Financial Officer and
                                                          Principal Accounting Officer)
    *                                                               Director                      March 2, 2006
-----------------------------------------------
                Joseph E. Canon
    *                                                               Director                      March 2, 2006
-----------------------------------------------
                 Mac A. Coalson
    *                                                               Director                      March 2, 2006
-----------------------------------------------
                 David Copeland
    *                                                               Director                      March 2, 2006
-----------------------------------------------
               Derrell E. Johnson
    *                                                               Director                      March 2, 2006
-----------------------------------------------
                Kade L. Matthews
    *                                                               Director                      March 2, 2006
-----------------------------------------------
            Raymond A. McDaniel, Jr.
    *                                                               Director                      March 2, 2006
-----------------------------------------------
                  Bynum Miers
    *                                                               Director                      March 2, 2006
-----------------------------------------------
                James M. Parker
    *                                                               Director                      March 2, 2006
-----------------------------------------------
                 Jack D. Ramsey
    *                                                               Director                      March 2, 2006
-----------------------------------------------
                Dian Graves Stai
    *                                                               Director                      March 2, 2006
-----------------------------------------------
                 F. L. Stephens
    *                                                               Director                      March 2, 2006
-----------------------------------------------
                 Johnny Trotter

*By:     /s/  J. Bruce Hildebrand
         ------------------------------------
         J. Bruce Hildebrand
         Individually and As Attorney-in-Fact
         March 2, 2006





                                                                    Exhibit 31.1
                                                                    ------------

                                Certification of
                             Chief Executive Officer
                       of First Financial Bankshares, Inc.

     I, F.  Scott  Dueser,  President  and  Chief  Executive  Officer  of  First
Financial Bankshares, Inc., certify that:

     1. I have reviewed this Form 10-K of First Financial Bankshares, Inc.;

     2. Based on my knowledge, this report does not contain any untrue statement
of a  material  fact or omit to  state a  material  fact  necessary  to make the
statements made, in light of the circumstances  under which such statements were
made, not misleading with respect to the period covered by this report;

     3. Based on my knowledge,  the financial  statements,  and other  financial
information included in this report, fairly present in all material respects the
financial  condition,  results of operations and cash flows of the registrant as
of, and for the periods presented in this report;

     4. The  registrant's  other  certifying  officer and I are  responsible for
establishing and maintaining  disclosure  controls and procedures (as defined in
Exchange Act Rules 13a-15 (e) and 15d-15(e)) and internal control over financial
reporting  (as defined in Exchange  Act Rules 13a-15 (f) and 15d-15 (f)) for the
registrant and have:

          a. Designed such disclosure  controls and  procedures,  or caused such
          disclosure   controls  and   procedures  to  be  designed   under  our
          supervision,  to ensure  that  material  information  relating  to the
          registrant,  including its consolidated subsidiaries, is made known to
          us by others within those entities,  particularly during the period in
          which this report is being prepared;

          b. Designed such internal control over financial reporting,  or caused
          such internal  control over  financial  reporting to be designed under
          our  supervision,   to  provide  reasonable  assurance  regarding  the
          reliability  of financial  reporting and the  preparation of financial
          statements for external purposes in accordance with generally accepted
          accounting principles;

          c. Evaluated the effectiveness of the registrant's disclosure controls
          and procedures and presented in this report our conclusions  about the
          effectiveness of the disclosure controls and procedures, as of the end
          of the period covered by this report based on such evaluation; and

          d.  Disclosed in this report any change in the  registrant's  internal
          control over financial reporting that occurred during the registrant's
          most  recent  fiscal  quarter  that  has  materially  affected,  or is
          reasonably  likely to materially  affect,  the  registrant's  internal
          control over financial reporting.

     5. The registrant's other certifying  officers and I have disclosed,  based
on our most recent evaluation of internal control over financial  reporting,  to
the  registrant's  auditors  and the audit  committee of  registrant's  board of
directors (or persons performing the equivalent functions):

          a. All significant  deficiencies and material weaknesses in the design
          or operation of internal  control over financial  reporting  which are
          reasonably  likely to  adversely  affect the  registrant's  ability to
          record, process, summarize and report financial information; and

          b. Any fraud,  whether or not material,  that  involves  management or
          other  employees  who  have a  significant  role  in the  registrant's
          internal control over financial reporting.

Date:    February 20, 2006

By:      /s/ F. SCOTT DUESER
         --------------------------------------------
         F. Scott Dueser
         President and Chief Executive Officer



                                                                    Exhibit 31.2
                                                                    ------------

                                Certification of
                             Chief Financial Officer
                       of First Financial Bankshares, Inc.

     I, J.  Bruce  Hildebrand,  Executive  Vice  President  and Chief  Financial
Officer of First Financial Bankshares, Inc., certify that:

     1. I have reviewed this Form 10-K of First Financial Bankshares, Inc.;

     2. Based on my knowledge, this report does not contain any untrue statement
of a  material  fact or omit to  state a  material  fact  necessary  to make the
statements made, in light of the circumstances  under which such statements were
made, not misleading with respect to the period covered by this report;

     3. Based on my knowledge,  the financial  statements,  and other  financial
information included in this report, fairly present in all material respects the
financial  condition,  results of operations and cash flows of the registrant as
of, and for the periods presented in this report;

     4. The  registrant's  other  certifying  officer and I are  responsible for
establishing and maintaining  disclosure  controls and procedures (as defined in
Exchange Act Rules 13a-15 (e) and 15d-15(e)) and internal control over financial
reporting  (as defined in Exchange  Act Rules 13a-15 (f) and 15d-15 (f)) for the
registrant and have:

          a. Designed such disclosure  controls and  procedures,  or caused such
          disclosure   controls  and   procedures  to  be  designed   under  our
          supervision,  to ensure  that  material  information  relating  to the
          registrant,  including its consolidated subsidiaries, is made known to
          us by others within those entities,  particularly during the period in
          which this report is being prepared;

          b. Designed such internal control over financial reporting,  or caused
          such internal  control over  financial  reporting to be designed under
          our  supervision,   to  provide  reasonable  assurance  regarding  the
          reliability  of financial  reporting and the  preparation of financial
          statements for external purposes in accordance with generally accepted
          accounting principles;

          c. Evaluated the effectiveness of the registrant's disclosure controls
          and procedures and presented in this report our conclusions  about the
          effectiveness of the disclosure controls and procedures, as of the end
          of the period covered by this report based on such evaluation; and

          d.  Disclosed in this report any change in the  registrant's  internal
          control over financial reporting that occurred during the registrant's
          most  recent  fiscal  quarter  that  has  materially  affected,  or is
          reasonably  likely to materially  affect,  the  registrant's  internal
          control over financial reporting.

     5. The registrant's other certifying  officers and I have disclosed,  based
on our most recent evaluation of internal control over financial  reporting,  to
the  registrant's  auditors  and the audit  committee of  registrant's  board of
directors (or persons performing the equivalent functions):

          a. All significant  deficiencies and material weaknesses in the design
          or operation of internal  control over financial  reporting  which are
          reasonably  likely to  adversely  affect the  registrant's  ability to
          record, process, summarize and report financial information; and

          b. Any fraud,  whether or not material,  that  involves  management or
          other  employees  who  have a  significant  role  in the  registrant's
          internal control over financial reporting.

Date:    February 20, 2006

By:      /s/ J. Bruce Hildebrand
         -----------------------------------
         J. Bruce Hildebrand
         Executive Vice President and Chief Financial Officer