|   | (Date of report)                  | March 31, 2010 |
|--------|-----------------------------------|----------------|
|   | (Date of earliest event reported) | March 29, 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 March 29, 2010, we announced that ONEOK Partners, L.P. and ONEOK, Inc. will release first-quarter 2010 earnings after the market closes on Wednesday, April 28, 2010. A joint conference call will be held the following day on April 29, 2010, at 11:00 a.m. Eastern Time (10:00 a.m. Central Time).  The conference call number is 866-802-4323, pass code 1446175.   The call will also be carried live at www.oneokpartners.com and www.oneok.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 944778.  |
| Item 9.01 |   | Financial Statements and Exhibits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|      |   |  Exhibits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|      |   | 99.1   News release issued by ONEOK, Inc. and ONEOK Partners, L.P. dated March 29, 2010.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|      |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |

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|   |           |   | ONEOK Partners, L.P.By:  ONEOK Partners GP, L.L.C., General Partner |
|--------|----------------|--------|-------------------------------------------------------------------------------|
|   |           |   |                                                                          |
| Date:  | March 31, 2010 | By:    | /s/ Derek S. Reiners                                                          |
|   |           |   | Senior Vice President andChief Accounting Officer                        |