CERTIFICATION
        PURSUANT TO
 SECTION
        302 OF THE SARBANES-OXLEY ACT
 
 
 I,
        Nicholas Gerber, certify that:
 
 1.
        I have
        reviewed this report on Form 10-Q of the United States Oil Fund,
        LP;
 
 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, changes in net assets, and cash flows (if
        the
        financial statements are required to include a statement of cash flows) of
        the
        registrant as of, and for, the periods presented in this report;
 
 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 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
        procedures and presented in this report our conclusions about the effectiveness
        of the disclosure controls and procedures, as of a date within 90 days prior
        to
        the filing date of 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
        half-year (the registrant's second fiscal half-year 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 to the
        registrant's auditors and the audit committee of the registrant's board of
        trustees (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.
 
 
 
 Date:
        May
        30, 2006
  
 
 /s/
        Nicholas D. Gerber
 ---------------------------------------
 Nicholas
        D. Gerber, Chief Executive Officer
 (principal
        executive officer)
  
  
 
 CERTIFICATION
        PURSUANT TO
 SECTION
        302 OF THE SARBANES-OXLEY ACT
 
 
 I,
        Howard
        Mah, certify that:
 
 1.
        I have
        reviewed this report on Form 10-Q of the United States Oil Fund,
        LP;
 
 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, changes in net assets, and cash flows (if
        the
        financial statements are required to include a statement of cash flows) of
        the
        registrant as of, and for, the periods presented in this report;
 
 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 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
        procedures and presented in this report our conclusions about the effectiveness
        of the disclosure controls and procedures, as of a date within 90 days prior
        to
        the filing date of 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
        half-year (the registrant's second fiscal half-year 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 to the
        registrant's auditors and the audit committee of the registrant's board of
        trustees (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.
 
 
 
 Date:
        May
        30, 2006
  
 
 /s/
        Howard Mah
 ---------------------------------------
 Howard
        Mah, Chief Financial Officer
 (principal
        financial officer)