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|   |  ̈ | REGISTRATION STATEMENT PURSUANT TO SECTION 12 OF |
|--------|--------|--------------------------------------------------|

|   | THE SECURITIES EXCHANGE ACT OF 1934 |
|--------|-------------------------------------|

|   | x | ANNUAL REPORT PURSUANT TO SECTION 13(a) OR 15(d) OF |
|--------|---|-----------------------------------------------------|

|   | THE SECURITIES EXCHANGE ACT OF 1934 |
|--------|-------------------------------------|

| For the fiscal year ended | December 31, 2012 |   | Commission File Number | 000-30514 |
|---------------------------|------------------------|--------|------------------------|-----------|

| ARC RESOURCES 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))                                                            |
|                                                                                                                     |
| 1200, 308 4th Avenue S.W., Calgary, Alberta, Canada T2P 0H7 (403) 503-8600                                               |
| (Address and telephone number of Registrant's principal executive offices)                                               |
|                                                                                                                     |
| Corporation Service Company, 2711 Centerville Road, Suite 400, Wilmington, Delaware 19805 (302) 636-5401                 |
| (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 registered |
|  N/A                                                                       |  N/A |

| Securities registered or to be registered pursuant to Section 12(g) of the Act.            |
|--------------------------------------------------------------------------------------------|
|                                                                                       |
| COMMON SHARES                                                                              |
| (Title of Class)                                                                           |
|                                                                                       |
| Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act. |
|                                                                                       |
| N/A                                                                                        |
| (Title of Class)                                                                           |

| x        Annual information form  | x         Audited annual financial statements  |
|--------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------|

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| A. | Annual Information Form |
|----|-------------------------|

| B. | Audited Annual Financial Statements |
|----|-------------------------------------|

| C. | Management's Discussion and Analysis |
|----|--------------------------------------|

| (a) | Certifications.  See Exhibits 99.4, 99.5, 99.6 and 99.7 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, 2012, 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. |
|-----|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (c) | Management’s Annual Report on Internal Control Over Financial Reporting.  The required disclosure is included in the "Management’s Report" that accompanies the Registrant’s Consolidated Financial Statements for the fiscal year ended December 31, 2012, filed as Exhibit 99.2 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 Chartered Accountants" that accompanies the Registrant’s Consolidated Financial Statements for the fiscal year ended December 31, 2012, filed as Exhibit 99.2 of this Annual Report on Form 40-F. |
|-----|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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| (e) | Changes in Internal Control Over Financial Reporting.  During the fiscal year ended December 31, 2012, there were no 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. |
|-----|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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|                                        |   | Payments Due by Period |   |
|---------------------------------------------|--------|------------------------|--------|
| (Cdn $ millions)                            |   | Less than 1 year       |   |   | 1-3 years |   |   | 3-5 years |   |   | Beyond 5 years |   |   | Total |   |
| Debt repayments (1)                         |   |                   | 39.7   |   |   |   | 83.0 |   |   |   | 81.5 |   |   |   | 583.2 |   |   |   | 787.4 |   |
| Interest payments (2)                       |   |                   | 37.0   |   |   |   | 66.7 |   |   |   | 57.0 |   |   |   | 95.4 |   |   |   | 256.1 |   |
| Reclamation fund contributions (3)          |   |                   | 4.0    |   |   |   | 7.1 |   |   |   | 6.4 |   |   |   | 54.4 |   |   |   | 71.9 |   |
| Purchase commitments                        |   |                   | 47.8   |   |   |   | 15.4 |   |   |   | 11.3 |   |   |   | 11.9 |   |   |   | 86.4 |   |
| Transportation commitments                  |   |                   | 42.8   |   |   |   | 71.1 |   |   |   | 34.3 |   |   |   | 0.2 |   |   |   | 148.4 |   |
| Operating leases                            |   |                   | 14.7   |   |   |   | 27.4 |   |   |   | 25.3 |   |   |   | 80.9 |   |   |   | 148.3 |   |
| Risk management contract premiums (4)       |   |                   | 0.5    |   |   |   | 4.8 |   |   |   | 4.8 |   |   |   | - |   |   |   | 10.1 |   |
| Accrued long term incentive compensation(5) |   |                   | -      |   |   |   | 46.8 |   |   |   | - |   |   |   | - |   |   |   | 46.8 |   |
| Total contractual commitments               |   |                   | 186.5  |   |   |   | 322.3 |   |   |   | 220.6 |   |   |   | 826.0 |   |   |   | 1,555.4 |   |

| (1) | Long-term and current portion of long-term debt. |
|-----|--------------------------------------------------|

| (2) | Fixed interest payments on senior notes. |
|-----|------------------------------------------|

| (3) | Contribution commitments to a restricted reclamation fund associated with the Redwater property. |
|-----|--------------------------------------------------------------------------------------------------|

| (4) | Fixed premiums to be paid in future periods on certain commodity risk management contracts. |
|-----|---------------------------------------------------------------------------------------------|

| (5) | Accrued long term incentive compensation amounts represent the total amount expected to be paid out on vesting. |
|-----|-----------------------------------------------------------------------------------------------------------------|

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| A. | Undertaking |
|----|-------------|

| B. | Consent to Service of Process |
|----|-------------------------------|

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|   | ARC RESOURCES LTD.(the Registrant) |                                  |
|--------|------------------------------------|---------------------------------------|
|   |                               |                                  |
|   |                               |                                  |   |
|   | By:                                | /s/ Myron M. Stadnyk             |   |
|   |                               | Myron M. Stadnyk                      |   |
|   |                               | President and Chief Executive Officer |   |
|   |                               |                                  |   |
|   | Date: March 27, 2013          |                                  |

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| Exhibit Number | Description                                                                                                                                                       |
|----------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|           |                                                                                                                                                              |
| 99.1           | Annual Information Form for the fiscal year ended December 31, 2012.                                                                                         |
|           |                                                                                                                                                              |
| 99.2           | Consolidated Financial Statements for the fiscal year ended December 31, 2012.                                                                               |
|           |                                                                                                                                                              |
| 99.3           | Management's Discussion and Analysis for the fiscal year ended December 31, 2012.                                                                            |
|           |                                                                                                                                                              |
| 99.4           | Certification of Chief Executive Officer pursuant to Rule 13a-14(a) or 15d-14(a) of the Securities Exchange Act of 1934.                                          |
|           |                                                                                                                                                              |
| 99.5           | Certification of Chief Financial Officer pursuant to Rule 13a-14(a) or 15d-14(a) of the Securities Exchange Act of 1934.                                          |
|           |                                                                                                                                                              |
| 99.6           | Certifications of Chief Executive Officer pursuant to Rule 13(a)-14(b) and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. 1350).     |
|           |                                                                                                                                                              |
| 99.7           | Certifications of Chief Financial Officer pursuant to Rule 13(a)-14(b) and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. 1350).     |
|           |                                                                                                                                                              |
| 99.8           | Consent of Deloitte LLP, Independent Registered Chartered Accountants.                                                                                            |
|           |                                                                                                                                                              |
| 99.9           | Consent of GLJ Petroleum Consultants Ltd. to the inclusion of the Report dated February 20, 2013 evaluating the reserves and resources of ARC Resources Ltd. |

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