|   | (Date of report)                  | May 7, 2010 |
|--------|-----------------------------------|-------------|
|   | (Date of earliest event reported) | May 5, 2010 |

| 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 5, 2010, we announced that we will present at the National Association of Publicly Traded Partnerships Investor Conference on Thursday, May 13, 2010, in Greenwich, Conn. John W. Gibson, the chairman, president and chief executive office of our general partner, ONEOK Partners GP, L.L.C., 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 ONEOK Partners’ Web site www.oneokpartners.com.  A replay of the webcast will be archived for 30 days after the conference. The company will also post the presentation on its Web site that morning, beginning at 8 a.m. Eastern Daylight Time (7 a.m. Central Daylight Time).  |
| Item 9.01 |   | Financial Statements and Exhibits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|      |   |  Exhibits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|      |   | 99.1   News release issued by ONEOK Partners, L.P. dated May 5, 2010.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|      |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |

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|   |        |   | ONEOK Partners, L.P.By:  ONEOK Partners GP, L.L.C., General Partner |
|--------|-------------|--------|-------------------------------------------------------------------------------|
|   |        |   |                                                                          |
| Date:  | May 7, 2010 | By:    | /s/ Curtis L. Dinan                                                           |
|   |        |   | Executive Vice President -Chief Financial Officer andTreasurer           |