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): October 17, 2005



                              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 2 - Financial Information
---------------------------------

Item 2.02  Results of Operations and Financial Condition

     Sonoma Valley Bancorp announced its results for the third quarter ended
September 30, 2005, on the press release attached as Exhibit 99.

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

Item 9.01 Financial Statements and Exhibits

         Exhibit No.       Exhibit Description

              99           Press release dated October 17, 2005, titled "Sonoma
                           Valley Bancorp Announces Record Levels of Assets and
                           Earnings for Third Quarter 2005"





<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: October 18, 2005     /s/ Mel Switzer, Jr.
                            ------------------------------------------
                            Mel Switzer, Jr.,
                            Chief Executive Officer and President
                            (Principal Executive Officer)


<PAGE>


                                  EXHIBIT INDEX


         Exhibit No.       Exhibit Description

              99           Press release dated October 17, 2005, titled "Sonoma
                           Valley Bancorp Announces Record Levels of Assets and
                           Earnings for Third Quarter 2005"
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{"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": "051144031"}, "business-address": {"street1": "C/O SONOMA VALLEY BANCORP", "street2": "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): October 17, 2005

                              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 2 - Financial Information
---------------------------------

Item 2.02  Results of Operations and Financial Condition

     Sonoma Valley Bancorp announced its results for the third quarter ended
September 30, 2005, on the press release attached as Exhibit 99.

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

Item 9.01 Financial Statements and Exhibits

         Exhibit No.       Exhibit Description

              99           Press release dated October 17, 2005, titled "Sonoma
                           Valley Bancorp Announces Record Levels of Assets and
                           Earnings for Third Quarter 2005"
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: October 18, 2005     /s/ Mel Switzer, Jr.
                            ------------------------------------------
                            Mel Switzer, Jr.,
                            Chief Executive Officer and President
                            (Principal Executive Officer)
EXHIBIT INDEX

         Exhibit No.       Exhibit Description

              99           Press release dated October 17, 2005, titled "Sonoma
                           Valley Bancorp Announces Record Levels of Assets and
                           Earnings for Third Quarter 2005"