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Exhibit 31.1 CERTIFICATIONS I, Michael C. Mayer, certify that: 1.) I have reviewed this quarterly report on Form 10-Q of Bank of Commerce
Holdings (the registrant); 2.) Based on my knowledge, this quarterly 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 quarterly
report: 3.) Based on my knowledge, the financial statements, and other financial
information included in this quarterly 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 quarterly report: 4.) The registrants other certifying officers and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13-a-15 (e) and 15d-15 (e) and internal control over
financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f))
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 quarterly report is being prepared:b.)
    
    Designed such internal control over financial reporting, or caused
such internal control over financial reporting to be designed under
our supervision, to provide reasonable assurance regarding the
reliability of financial reporting and the preparation of financial
statements for external purposes in accordance with generally accepted
accounting principles;c.)
    
    Evaluated the effectiveness of the registrants disclosure controls
and presented in this quarterly report our conclusions about the
effectiveness of the disclosure controls and procedures based on such
evaluation as of the Evaluation Date.d.)
    
    Disclosed in this report any change in internal control over financial
reporting that occurred during the most recent fiscal quarter that has
materially affected, or is reasonably likely to materially affect,
internal control over financial reporting; and 5.) The registrants other certifying officers and I have disclosed, based on
our most recent evaluation, to the registrants auditors
and the audit committee of the registrants board of directors:  a.)
    
    All significant deficiencies in the design or operation of internal
controls which could adversely affect the registrants ability to
record, process, summarize and report financial data and have
identified for the registrants auditors any material weaknesses in
internal controls: andb.)
    
    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. /s/ MICHAEL C. MAYER Michael C. Mayer
President & Chief Executive Officer
(Principal Executive Officer) Dated August 5, 2004 29