| (Date      of report)                  | April      8, 2009 |
|----------------------------------------|--------------------|
| (Date      of earliest event reported) | April      6, 2009 |

| 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      April 6, 2009, we announced that ONEOK, Inc. and ONEOK Partners, L.P. will      release first-quarter 2009 earnings after the market closes on Wednesday,      April 29, 2009. A      joint conference call will be held the following day on April 30, 2009, at      11:00 a.m. Eastern Daylight Time (10:00 a.m. Central Daylight      Time).  The conference call number is 866-259-6033, pass code      1350009.  The call will also be carried live at www.oneok.com      and www.oneokpartners.com.  A replay will be available on both      web sites for 30 days.  A recording will be available by phone      for seven days.  The playback call may be accessed at      866-837-8032, pass code 1350009.  |
| Item 9.01 |   | Financial Statements and      Exhibits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|      |   |  Exhibits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|      |   | 99.1   News      release issued by ONEOK, Inc. and ONEOK Partners, L. P. dated April 6,      2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|      |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |

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|   |               |   | ONEOK      Partners, L.P.By:  ONEOK      Partners GP, L.L.C., General Partner |
|--------|--------------------|--------|-----------------------------------------------------------------------------------------|
|   |               |   |                                                                                    |
| Date:  | April      8, 2009 | By:    | /s/ Curtis L. Dinan                                                                     |
|   |               |   | Executive      Vice President -Chief      Financial Officer andTreasurer           |

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