|   | (Date of report)                  | April 22, 2011 |
|--------|-----------------------------------|----------------|
|   | (Date of earliest event reported) | April 20, 2011 |

| 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 20, 2011, the board of directors of our general partner, ONEOK Partners GP, L.L.C., announced an increase in our quarterly cash distribution for the quarter ended March 31, 2011.  A copy of the news release is attached as exhibit 99.1 and is incorporated herein by reference. The information disclosed in this Item 7.01, including Exhibit 99.1 hereto, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the Exchange Act), or otherwise subject to the liabilities under that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act except as expressly set forth by specific reference in such filing.  |
|-----------|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Item 8.01 |   | Other Events                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|      |   |  On April 20, 2011, the board of directors of our general partner, ONEOK Partners GP, L.L.C., announced an increase in our quarterly cash distribution to $1.15 per unit from $1.14 per unit, effective for the first quarter 2011.  The first-quarter distribution is payable on May 13, 2011, to unitholders of record as of April 29, 2011.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
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| Item 9.01 |   | Financial Statements and Exhibits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|      |   |  Exhibits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|      |   | 99.1      News release issued by ONEOK Partners, L.P. dated April 20, 2011.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|      |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|      |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |

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|        |                 |      | ONEOK Partners, L.P.By:  ONEOK Partners GP, L.L.C., General Partner               |
|-------------|----------------------|-----------|---------------------------------------------------------------------------------------------|
|        |                 |      |                                                                                        |
|  Date: |  April 22, 2011 |  By: |  /s/ Robert F. Martinovich                                                             |
|        |                 |      | Robert F. MartinovichSenior Vice President,Chief Financial Officer andTreasurer   |