|   | (Date      of report)                  | May      26, 2010 |
|--------|----------------------------------------|-------------------|
|   | (Date      of earliest event reported) | May      25, 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 25, 2010, we announced      that we will participate in the Wells Fargo Natural Gas Liquids      Summit on Wednesday, May 26, 2010, in Houston, Texas.Terry      K. Spencer, our chief operating officer, will present.Presentation      slides will be posted on our website www.oneokpartners.com at 4 p.m.      Eastern Daylight Time (3 p.m. Central Daylight Time) on May 26,      2010.  |
|      |   |                                                                                                                                                                                                                                                                                                                                                                                                            |
| Item 9.01 |   | Financial Statements and      Exhibits                                                                                                                                                                                                                                                                                                                                                                          |
|      |   |  Exhibits                                                                                                                                                                                                                                                                                                                                                                                                  |
|      |   |  99.1           News release issued by ONEOK Partners, L.P. dated May 25,  2010.                                                                                                                                                                                                                                                                                                  |
|      |   |                                                                                                                                                                                                                                                                                                                                                                                                            |
|      |   |                                                                                                                                                                                                                                                                                                                                                                                                            |

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|   |              |   | ONEOK,      Inc.                                                            |
|--------|-------------------|--------|-----------------------------------------------------------------------------|
|   |              |   |                                                                        |
| Date:  | May      26, 2010 | By:    | /s/ Curtis Dinan                                                            |
|   |              |   | Curtis      Dinan                                                           |
|   |              |   | Senior      Vice President -Chief      Financial Officer andTreasurer  |