UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 40-FOMB APPROVAL

OMB Number: 3235-0381
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  o
REGISTRATION STATEMENT PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934ORþ
ANNUAL REPORT PURSUANT TO SECTION 13(a) OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
  For the fiscal year ended:  December 31, 2009
Commission File Number:  001-34406
  ADVANTAGE OIL & GAS LTD.
(Exact name of Registrant as specified in its charter)N/A
(Translation of Registrant’s name into English (if applicable))ALBERTA
(Province or other jurisdiction of incorporation or organization)1311
(Primary Standard Industrial Classification Code Number (if applicable))N/A
(I.R.S. Employer Identification Number (if applicable))Suite 700, 400 - 3 Avenue SW, Calgary, Alberta T2P 4H2 (403) 718-8000
(Address and telephone number of Registrant’s principal executive offices)Corporation Service Company
1133 Avenue of Americas, 31st Floor, New York, NY 10036  1-800-927-9800
(Name, address (including zip code) and telephone number (including area code)
of agent for service in the United States)  Securities registered or to be registered pursuant to Section 12(b) of the Act.  Title of each class

Name of each exchange on which registeredCommon Shares

New York Stock ExchangeSecurities registered or to be registered pursuant to Section 12(g) of the Act.
  None
(Title of Class)Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act.None
(Title of Class) SEC 2285 (03-07)
Persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
  For annual reports, indicate by check mark the information filed with this Form:
  þAnnual information form
þAudited annual financial statements
 
 Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report.
  Common Shares: 162,745,528
  Indicate by check mark whether the Registrant by filing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934 (the “Exchange Act”).  If “Yes” is marked, indicate
the file number assigned to the Registrant in connection with such Rule.
  Yes ̈
82-________
Noþ
 
 Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Exchange Act during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports) and (2) has been subject to such filing requirements for the past
90 days.
  Yesþ
No ̈
 
 Indicate by check mark whether the Registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter
period that the Registrant was required to submit and post such files).
  Yes ̈
No ̈
  
 DOCUMENTS INCLUDED IN THIS FORM
  The following documents are included in the Form:
  
  No.

Document1.

Annual Information Form of the Registrant for the year ended December 31, 2009. (filed herein as Exhibit 99.1)2.

Consolidated Financial Statements of the Registrant for the fiscal year ended December 31, 2009; including a reconciliation to US GAAP (Note 15). (filed herein as Exhibit 99.2)3.

Management’s Discussion and Analysis of the Registrant for the fiscal year ended December 31, 2009 (filed herein as Exhibit 99.3).4.

Consent of PricewaterhouseCoopers LLP to the inclusion of the Auditors’ Report dated March 16, 2010 on the Registrant’s Audited Consolidated Financial Statements for the fiscal year ended December 31, 2009.5.

Consent of Sproule Associated Limited to the incorporation by reference herein of its Statement of Reserves Data and other Information in Form 51-101F1, which statement and report is contained in the Registrant’s Annual Information Form for the fiscal year ended December 31, 2009.6.

CEO Certification pursuant to rule 13a-14(a) of the Exchange Act.7.

CFO Certification pursuant to rule 13a-14(a) of the Exchange Act.8.

CEO Certification pursuant to U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.9.

CFO Certification pursuant to U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
 
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  PRINCIPAL DOCUMENTS
  A.           Annual Information Form
  For the Annual Information Form for the fiscal year ended December 31, 2009, see Exhibit 99.1 included herein.
  B.           Audited Annual Financial Statements
  For consolidated audited financial statements, including the report of independent chartered accountants with respect thereto, see the Consolidated Financial Statements of the Registrant for the fiscal year ended December 31, 2009, included as Exhibit 99.2 herein. The Registrant’s financial statements have
been reconciled to United States generally accepted accounting principles (“US GAAP”) as required by Form 40-F under the Exchange Act. See Note 15 - Reconciliation of Financial Statements to United States Generally Accepted Accounting Principles in the 2009 Consolidated Financial Statements.
  C.           Management’s Discussion and Analysis
  For management’s discussion and analysis, see Management’s Discussion and Analysis of the Registrant for the fiscal year ended December 31, 2009, included as Exhibit 99.3 herein.
  CERTIFICATIONS AND DISCLOSURES REGARDING
 CONTROLS AND PROCEDURES
  A.           CERTIFICATIONS. See Exhibits 31.1 and 31.2 to this Annual Report on Form 40-F.
  B.           DISCLOSURE CONTROLS AND PROCEDURES. As of the end of the Registrant’s fiscal year ended December 31, 2009, an evaluation of the effectiveness of the Registrant’s “disclosure controls and procedures” (as such term is defined
in Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) was carried out by the Registrant’s management with the participation of the principal executive officer and principal financial officer. Based upon that evaluation, the Registrant’s principal executive officer and principal  financial officer have concluded that as of the end of that fiscal year, the Registrant’s disclosure controls and procedures are effective to
ensure that information required to be disclosed by the Registrant  in reports that it files or submits under the Exchange Act is (i) recorded, processed, summarized and reported within the time periods specified in Securities and Exchange Commission rules and forms and (ii) accumulated and communicated to the Registrant’s management, including its principal executive officer and principal financial officer, to allow timely decisions regarding required disclosure.
  It should be noted that while the Registrant’s principal executive officer and principal financial officer believe that the Registrant’s disclosure controls and procedures provide a reasonable level of assurance that they are effective, they do not expect that the Registrant’s disclosure controls
and procedures or internal control over financial reporting will prevent all errors and fraud. A control system, no matter how well conceived or operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Reference is made in the “Controls and Procedures” and “Evaluation of Disclosure Controls and Procedures” sections of Management’s Discussion and Analysis of the Registrant for the fiscal year ended December 31, 2009, included
herein.
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  C.           MANAGEMENT’S ANNUAL REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING. The required disclosure is included in “Management’s Report on Internal Control over Financial Reporting” that accompanies the Registrant’s Consolidated
Financial Statements for the fiscal year ended December 31, 2009, filed as part of this Annual Report on Form 40-F.
  D.           ATTESTATION REPORT OF THE REGISTERED PUBLIC ACCOUNTING FIRM. The required disclosure is included in the “Report of Independent Registered Public Accounting Firm” that accompanies the Registrant’s Consolidated Financial Statements
for the fiscal year ended December 31, 2009, filed as part of this Annual Report on Form 40-F.
  E.           CHANGES IN INTERNAL CONTROL OVER FINANCIAL REPORTING. During the fiscal year ended December 31, 2009, there were no significant changes in the Registrant’s internal control over financial reporting that have materially affected, or are reasonably
likely to materially affect, the Registrant’s internal control over financial reporting. Reference is made in the “Controls and Procedures” section of Management’s Discussion and Analysis of the Registrant for the fiscal year ended December 31, 2009, included herein.
  NOTICES PURSUANT TO REGULATION BTR
  None.
  CODE OF ETHICS FOR CHIEF EXECUTIVE OFFICER
 AND SENIOR FINANCIAL OFFICERS
  The Registrant has adopted a Code of Ethics for its senior officers, principal financial officer and controller or principal accounting officer, directors and employees. This code applies to the Chief Executive Officer, President and Chief Financial Officer, Senior Vice President, the Vice President, Finance,
Vice President, Geosciences and Land, Vice President Exploitations,  Directors and employees. It is available on the Registrant’s web site at www.advantageog.com and in print to any shareholder who requests it. All amendments to the code, and all waivers of the code with respect to any of the officers covered by it, will be posted on the Registrant’s web site and provided in print to any shareholder who requests them.
  AUDIT COMMITTEE
  Identification of Audit Committee
  The following individuals comprise the entire membership of the Advantage Audit Committee:  Carol Pennycook, Paul Haggis, Ronald McIntosh and Stephen Balog.
  Audit Committee Financial Experts
  Paul G. Haggis has been determined by the board of the Registrant to meet the “audit committee financial expert” criteria prescribed by the Securities and Exchange Commission and has been designated as audit committee financial expert for the Audit Committee of the board of the Registrant.
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  Each of the directors serving on the Audit Committee has also been determined by the board of the Registrant to be independent within the criteria established by the New York Stock Exchange, Inc. for audit committee membership.
  PRINCIPAL ACCOUNTING FEES AND
 SERVICES - INDEPENDENT AUDITORS
  Fees payable to the Registrant’s independent auditors for the years ended December 31, 2009 and December 31, 2008, totaled $718,000 and $707,811, respectively, as detailed in the following tables. All funds are in Canadian dollars.
  The following table discloses fees billed to the Registrant by its current auditors, PricewaterhouseCoopers LLP:
  Year ended
December 31, 2009


Year ended
December 31, 2008Audit Fees

$
663,000


$
515,200Audit-Related Fees

$
55,000


$
38,440Tax Fees

$
0


$
154,171All Other Fees

$
0


$
0TOTAL

$
718,000


$
707,811
 
 The nature of the services provided by the Registrant’s independent auditors under each of the categories indicated in the table is described below.
  Audit Fees
  Audit fees were for professional services rendered by the Registrant’s independent auditors for the audit of the Registrant’s annual financial statements and services provided in connection with statutory and regulatory filings or engagements. These services include audit or review of financials forming
part of such prospectus and US GAAP reconciliation matters.
  Audit-Related Fees
  Audit-related fees were for assurance and related services reasonably related to the performance of the audit or review of the annual statements and are not reported under “Audit Fees” above. These services include French translation in connection with prospectus filing.
  Tax Fees
  Tax fees were for tax advice and tax planning professional services. These services consisted of general tax planning and advisory services relating to common forms of domestic and international taxation (i.e., income tax, capital tax, goods and services tax).
  All Other Fees
  None.
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  PREAPPROVAL POLICIES AND PROCEDURES
  In 2009, Advantage’s Audit Committee pre-approved all audit, audit-related and tax fees. The Audit Committee will be informed routinely as to the non-audit services actually provided by the auditor pursuant to this pre-approval process. The auditors also present the estimate for the annual audit related
services to the Audit Committee for approval prior to undertaking the annual audit of the financial statements.
  OFF-BALANCE SHEET ARRANGEMENTS
  None.
  CONTRACTUAL OBLIGATIONS
  Payments due by period (Cdn$MM)Total


Less than
1 year


1-3 years


3-5 years


More than
5 yearsBuilding Leases

$
6.4


$
3.9


$
2.5


$
0


$
0Capital Leases

$
2.1


$
1.4


$
0.7


$
0


$
0Pipeline/Transportation

$
25.9


$
4.4


$
13.2


$
8.3


$
0Convertible Debentures (1)

$
218.5


$
69.9


$
62.3


$
0


$
86.3Total Contractual Obligations

$
252.9


$
79.6


$
78.7


$
8.3


$
86.3
 
 (1)
As at December 31, 2009, Advantage had $218.5 million convertible debentures outstanding (excluding interest payable during the various debenture terms). Each series of convertible debentures are convertible to Common Shares based on an established conversion price. All remaining obligations related to convertible debentures can be settled through the payment of cash or issuance of Common Shares at Advantage’s
option.
  (2)
Bank indebtedness of $250.3 million has been excluded from the contractual obligations table as the credit facilities constitute a revolving facility for a 364 day term which is extendible annually for a further 364 day revolving period at the option of the syndicate. If not extended, the revolving credit facility is converted to a one year term facility with the first payment due one year after commencement
of the term.
  DISCLOSURES PURSUANT TO REQUIREMENTS OF THE
 NEW YORK STOCK EXCHANGE
  Presiding Director at Meetings of Non-Management Directors
  The Registrant schedules regular executive sessions in which the Registrant’s “non-management directors” (as that term is defined in the rules of the New York Stock Exchange) meet without management participation. Steven Sharpe serves as the presiding director (the “Chair of the Board”)
at such sessions. Each of the Registrant’s non-management directors is “independent” as such term is used in the rules of the Canadian Securities Commissions and the New York Stock Exchange Corporate Governance Standards.
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  Communication with Non-Management Directors
  Shareholders may send communications to the Registrant’s non-management directors by writing to Investors Relations, Canterra Tower, Suite 700, 400 - 3 Avenue SW, Calgary, Alberta T2P 4H2, or calling the toll free number at 1-866-393-0393. Communications will be referred to the Chair of the Board for appropriate
action. The status of all outstanding concerns addressed to the Chair of the Board will be reported to the board of directors as appropriate.
  Corporate Governance Guidelines
  According to NYSE Rule 303A.09, a listed company must adopt and disclose a set of corporate governance guidelines with respect to specified topics and must disclose any significant ways in which its practices differ from those followed by US domestic companies under the NYSE rules. Such guidelines and disclosures
are required to be posted on the listed company’s website. The Registrant has adopted the required guidelines and made the required disclosures, all of which are available on the Registrant’s website at www.advantageog.com and in print to any shareholder who requests them.
  Board Committee Charters
  Advantage’s Audit Committee Charter, the Terms of Reference of the Human Resources, Compensation and Corporate Governance Committee and the Terms of Reference for the Independent Reserve Evaluation Committee are available for viewing on the Registrant’s website at www.advantageog.com and
are available in print to any person who requests them. Requests for copies of these documents should be made by contacting:  Investor Relations, Canterra Tower, Suite 700, 400 - 3 Avenue SW, Calgary, Alberta T2P 4H2.
  UNDERTAKING
  The Registrant undertakes to make available, in person or by telephone, representatives to respond to inquiries made by the Commission staff, and to furnish promptly, when requested to do so by the Commission staff, information relating to: the securities registered pursuant to Form 40-F; the securities
in relation to which the obligation to file an annual report on Form 40-F arises; or transactions in said securities.
  CONSENT TO SERVICE OF PROCESS
  The Registrant has previously filed with the Commission a Form F-X in connection with the Common Shares.
  Any change to the name or address of the agent for service of process of the Registrant shall be communicated promptly to the Securities and Exchange Commission by an amendment to the Form F-X referencing the file number of the relevant registration statement.
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  EXHIBITS
  The following exhibits are filed as part of this report.
  Exhibit
Number

Description23.1

Consent of PricewaterhouseCoopers LLP to the inclusion of the Auditors’ Report dated March 16, 2010 on the Registrant’s Audited Consolidated Financial Statements for the fiscal year ended December 31, 2009.23.2

Consent of Sproule Associated Limited to the incorporation by reference herein of its Statement of Reserves Data and other Information in Form 51-101F1, which statement and report is contained in the Registrant’s Annual Information Form for the fiscal year ended December 31, 2009.31.1

CEO Certification pursuant to rule 13a-14(a) of the Exchange Act.31.2

CFO Certification pursuant to rule 13a-14(a) of the Exchange Act.32.1

CEO Certification pursuant to U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.32.2

CFO Certification pursuant to U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.99.1

Annual Information Form of the Registrant for the year ended December 31, 2009.99.2

Consolidated Financial Statements of the Registrant for the fiscal year ended
December 31, 2009, including a reconciliation to US GAAP (Note 15).99.3

Management’s Discussion and Analysis of the Registrant for the fiscal year ended December 31, 2009.
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  SIGNATURE
  Pursuant to the requirements of the Exchange Act, the Registrant certifies that it meets all of the requirements for filing on Form 40-F and has duly caused this Annual Report on Form 40-F to be signed on its behalf by the undersigned, thereto duly authorized, in the City of Calgary, Province of Alberta, Canada.
  Dated:  March 18, 2010
 
  ADVANTAGE OIL & GAS LTD.By:
/s/ Kelly DraderName:
Kelly DraderTitle:
President and Chief Financial Officer
 
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