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                                    FORM 6-K
                     U.S. SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                        REPORT OF FOREIGN PRIVATE ISSUER
                   PURSUANT TO RULE 13A-16 OR 15D-16 UNDER THE
                         SECURITIES EXCHANGE ACT OF 1934

                             dated November 28, 2005


                         Commission File Number 1-14878


                                   GERDAU S.A.
                    (Exact Name as Specified in its Charter)

                                      N/A
                                      ---
                       (Translation of Registrant's Name)

                                                           Av. Farrapos 1811
             Porto Alegre, Rio Grande do Sul - Brazil CEP 90220-005
                    (Address of principal executive offices)


         Indicate by check mark whether the registrant files or will file annual
reports under cover Form 20-F or Form 40-F.

         Form 20-F   X     Form 40-F
                   -----             -----

         Indicate by check mark if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101(b)(1): ____

         Indicate by check mark if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101(b)(7): ____

         Indicate by check mark whether by furnishing the information contained
in this Form, the registrant is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

         Yes                        No   X
             -----                     -----

         If "Yes" is marked, indicate below the file number assigned to the
registrant in connection with Rule 12g3-2(b): Not applicable.

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                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused the Report to be signed on its behalf by the
undersigned, thereunto duly authorized.

Date:  November 28, 2005

                                GERDAU S.A.




                                By: /s/ Osvaldo  Burgos Schirmer
                                    --------------------------------------------
                                    Name:  Osvaldo Burgos Schirmer
                                    Title: Chief Financial Officer



                                  EXHIBIT INDEX


Exhibit       Description of Exhibit
-------       ----------------------

99.1          Notice to Shareholders, November 8, 2005

99.2          Relevant Fact, November 15, 2005

99.3          Gerdau S.A.--Consolidated 2005 First Nine Months, November 8, 2005