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**EXHIBIT      31.1**

**CERTIFICATIONS**

|   | 1. | I                have reviewed this 10-Q of Sonoma Valley Bancorp;                                                                                                                                                                                                                                                                                                                                             |
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|   | 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;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
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|   | 4.  | The                registrant's other certifying officer(s) 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)) 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 isbeing 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) 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 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 (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. |
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| Date:  |       August                8, 2007 |   | /s/                Mel Switzer, Jr.                  |
|--------|-------------------------------------------------------------------|--------|------------------------------------------------------|
|   |                                                              |   | Mel                Switzer, Jr.                      |
|   |                                                              |   | President                and Chief Executive Officer |
|   |                                                              |   | (Principal                Executive Officer)         |

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