EXHIBIT 31.1

                                 CERTIFICATIONS

I, Mel Switzer, Jr., certify that:

     1.   I have reviewed this 10-Q of Sonoma Valley Bancorp;

     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(s) an I are responsible for
          establishing  and maintaining  disclosure  controls and procedures (as
          defined  in  Exchange  Act  Rules  13a-15(e)  and  15d-15(e))  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)  omitted;

          (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 (the registrant's  fourth
               fiscal  quarter  in  the  case  of an  annual  report)  that  has
               materially  affected,  or  is  reasonably  likely  to  materially
               affect,   the   registrant's   internal  control  over  financial
               reporting; and

     5.   The  registrant's  other  certifying  officer(s) an 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 the
          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



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          (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:   August 13, 2003                    /s/ Mel Switzer, Jr.
     -------------------------             -------------------------------------
                                           Mel Switzer, Jr.
                                           President and Chief Executive Officer
                                           (Principal Executive Officer)


                                     Page 28

<PAGE>



                                                                    EXHIBIT 31.2

                                 CERTIFICATIONS

I, Mary Quade Dieter, certify that:

          1.   I have reviewed this Form 10-Q of Sonoma Valley Bancorp;

          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(s) an I are responsible
               for   establishing  and  maintaining   disclosure   controls  and
               procedures  (as  defined  in  Exchange  Act Rules  13a-15(e)  and
               15d-15(e)) 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)  omitted;

               (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  (the
                    registrant's  fourth fiscal quarter in the case of an annual
                    report)  that  has  materially  affected,  or is  reasonably
                    likely  to  materially  affect,  the  registrant's  internal
                    control over financial reporting; and

     5.   The  registrant's  other  certifying  officer(s) an 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 the
          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




                                     Page 29

<PAGE>



               (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.


Dated:    August 13, 2003             /s/ Mary Quade Dieter
       -------------------------      ------------------------------------------
                                      Mary Quade Dieter
                                      Chief Financial Officer
                                      (Principal Finance and Accounting Officer)