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): March 15, 2006



                              SONOMA VALLEY BANCORP
                              ---------------------
             (Exact name of registrant as specified in its charter)


     California                    000-31929                  68-0454068
     ----------                    ---------                  ----------
  (State or other             (Commission File No.)        (I.R.S. Employer
    jurisdiction                                          Identification No.)
  of incorporation)



                 202 West Napa Street, Sonoma, California 95476
                 ----------------------------------------------
               (Address of principal executive offices) (Zip Code)


                          (707) 935-3200 (Registrant's
                          ----------------------------
                     telephone number, including area code)


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))


<PAGE>

Section 5 - Corporate Governance and Management
-----------------------------------------------

Item 5.03 Amendments to Articles of  Incorporation  or Bylaws;  Change in Fiscal
          Year

          On March 15, 2006 Sonoma Valley Bancorp ("Company") refiled its Bylaws
in order to  correct  certain  grammatical  errors and  omissions  from the copy
originally  filed,  to conform  with the original  signed  bylaws on file at the
Company.  The substance of the Bylaws was not altered or amended.  A copy of the
Bylaws is attached hereto as Exhibit 3(ii).


Section 9 - Financial Statements and Exhibits
---------------------------------------------

Item 9.01 Financial Statements and Exhibits

          Exhibit No.                Exhibit Description
          -----------                -------------------
             3(ii)                   Bylaws




<PAGE>


                                    SIGNATURE

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


                                    SONOMA VALLEY BANCORP,
                                    a California Corporation


Dated:  3/15/2006                   /s/ Mary Dieter Smith
                                    --------------------------------------------
                                    Mary Smith,
                                    Executive Vice President, Chief Operating
                                    Officer and Chief Financial Officer
                                    (Principal Financial and Accounting Officer)


<PAGE>


                                  EXHIBIT INDEX


         Exhibit No.                Description
         -----------                -----------

           3(ii)                    Bylaws
[{"type": "8-K", "sequence": "1", "filename": "for031506.txt", "secsgml_size_bytes": 3775}]
{"company-data": {"conformed-name": "SONOMA VALLEY BANCORP", "cik": "0001120427", "assigned-sic": "6021", "irs-number": "680454068", "state-of-incorporation": "CA", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-31929", "film-number": "06695027"}, "business-address": {"street1": "C/O SONOMA VALLEY BANCORP", "street2": "202 WEST NAPA STREET", "city": "SONOMA", "state": "CA", "zip": "95476", "phone": "9164420400"}, "mail-address": {"street1": "202 WEST NAPA STREET", "city": "SONOMA", "state": "CA", "zip": "95476"}}
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): March 15, 2006

                              SONOMA VALLEY BANCORP
                              ---------------------
             (Exact name of registrant as specified in its charter)

     California                    000-31929                  68-0454068
     ----------                    ---------                  ----------
  (State or other             (Commission File No.)        (I.R.S. Employer
    jurisdiction                                          Identification No.)
  of incorporation)

                 202 West Napa Street, Sonoma, California 95476
                 ----------------------------------------------
               (Address of principal executive offices) (Zip Code)

                          (707) 935-3200 (Registrant's
                          ----------------------------
                     telephone number, including area code)

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))
Section 5 - Corporate Governance and Management
-----------------------------------------------

Item 5.03 Amendments to Articles of  Incorporation  or Bylaws;  Change in Fiscal
          Year

          On March 15, 2006 Sonoma Valley Bancorp ("Company") refiled its Bylaws
in order to  correct  certain  grammatical  errors and  omissions  from the copy
originally  filed,  to conform  with the original  signed  bylaws on file at the
Company.  The substance of the Bylaws was not altered or amended.  A copy of the
Bylaws is attached hereto as Exhibit 3(ii).

Section 9 - Financial Statements and Exhibits
---------------------------------------------

Item 9.01 Financial Statements and Exhibits

          Exhibit No.                Exhibit Description
          -----------                -------------------
             3(ii)                   Bylaws
SIGNATURE

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

                                    SONOMA VALLEY BANCORP,
                                    a California Corporation

Dated:  3/15/2006                   /s/ Mary Dieter Smith
                                    --------------------------------------------
                                    Mary Smith,
                                    Executive Vice President, Chief Operating
                                    Officer and Chief Financial Officer
                                    (Principal Financial and Accounting Officer)
EXHIBIT INDEX

         Exhibit No.                Description
         -----------                -----------

           3(ii)                    Bylaws