|   | (Date of report)                  | April 22, 2010 |
|--------|-----------------------------------|----------------|
|   | (Date of earliest event reported) | April 20, 2010 |

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

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| Item 8.01 |   | Other Events                                                                                                                                                                                                                                                                                                                                                                                                                  |
|-----------|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|      |   |  On April 20, 2010, the board of directors of our general partner, ONEOK Partners GP, L.L.C., announced an increase in our quarterly cash distribution to $1.11 per unit from $1.10 per unit, effective for the first quarter 2010, resulting in an annualized cash distribution of $4.44 per unit.  The first-quarter distribution is payable on May 14, 2010, to unitholders of record as of April 30, 2010. |
|      |   |                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Item 9.01 |   | Financial Statements and Exhibits                                                                                                                                                                                                                                                                                                                                                                                             |
|      |   |  Exhibits                                                                                                                                                                                                                                                                                                                                                                                                                |
|      |   | 99.1      News release issued by ONEOK Partners, L.P. dated April 20, 2010.                                                                                                                                                                                                                                                                                                                     |
|      |   |                                                                                                                                                                                                                                                                                                                                                                                                                          |
|      |   |                                                                                                                                                                                                                                                                                                                                                                                                                          |

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|   |           |   | ONEOK Partners, L.P.By:  ONEOK Partners GP, L.L.C., General Partner |
|--------|----------------|--------|-------------------------------------------------------------------------------|
|   |           |   |                                                                          |
| Date:  | April 22, 2010 | By:    | /s/ Curtis L. Dinan                                                           |
|   |           |   | Executive Vice President -Chief Financial Officerand Treasurer                |
|   |           |   |                                                                          |