|   | (Date of report)                  | May 3, 2011 |
|--------|-----------------------------------|-------------|
|   | (Date of earliest event reported) | May 2, 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 May 2, 2011, we announced plans to invest approximately $910 million to $1.2 billion between now and late 2013 in order to build a new natural gas liquids pipeline from the Mid-Continent region to the Texas Gulf Coast, reconfigure our existing Sterling I and II pipelines, and construct a new fractionator to serve the Gulf Coast market.  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 9.01                                           |   | Financial Statements and Exhibits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|                                                |   |  Exhibits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|                                                |   | 99.1      News release issued by ONEOK Partners, L.P. dated May 2, 2011.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
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|   |        |   | ONEOK Partners, L.P.By:  ONEOK Partners GP, L.L.C., General Partner   |
|--------|-------------|--------|---------------------------------------------------------------------------------|
|   |        |   |                                                                            |
| Date:  | May 3, 2011 | By:    | /s/ Robert F. Martinovich                                                       |
|   |        |   | Robert F. MartinovichSenior Vice President,Chief Financial Officer andTreasurer |
|   |        |   |                                                                            |