|   | (Date of report)                  | May 21, 2012 |
|--------|-----------------------------------|--------------|
|   | (Date of earliest event reported) | May 17, 2012 |

| Delaware                     |   | 1-12202      |   | 93-1120873          |
|------------------------------|--------|--------------|--------|---------------------|
| (State or other jurisdiction |   | (Commission  |   | (IRS Employer       |
| of incorporation)            |   | File Number) |   | Identification No.) |

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| Item 7.01 |   | Regulation FD Disclosure                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|-----------|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|      |   |  On May 17, 2012, we announced we will present at the National Association of Publicly Traded Partnerships Investor Conference on Thursday, May 24, 2012, in Greenwich, Connecticut.  A copy of the news release is attached as Exhibit 99.1 and is incorporated herein by reference. Terry K. Spencer, president of ONEOK Partners, GP, L.L.C., our general partner, will present at the conference at 8 a.m. Eastern Daylight Time (7 a.m. Central Daylight Time). The conference will be webcast and will be accessible on our website, www.oneokpartners.com.  A replay of the webcast will be archived for 30 days after the conference. We will also post the presentation on our website that morning beginning at 8 a.m. Eastern Daylight Time (7 a.m. Central Daylight Time). The information disclosed in this Item 7.01, including Exhibit 99.1 hereto, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the Exchange Act), or otherwise subject to the liabilities under that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act except as expressly set forth by specific reference in such filing.  |
| Item 9.01 |   | Financial Statements and Exhibits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|      |   |  Exhibits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|      |   | 99.1 News release issued by ONEOK Partners, L.P. dated May 17, 2012                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |

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|   |         |   | ONEOK Partners, L.P.By:  ONEOK Partners GP, L.L.C., General Partner            |
|--------|--------------|--------|------------------------------------------------------------------------------------------|
|   |         |   |                                                                                     |
| Date:  | May 21, 2012 | By:    | /s/ Robert F. Martinovich                                                                |
|   |         |   | Robert F. MartinovichExecutive Vice President,Chief Financial Officer andTreasurer  |