|   | (Date of report)                  | June 1, 2011 |
|--------|-----------------------------------|--------------|
|   | (Date of earliest event reported) | May 25, 2011 |

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

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| Item 5.02 |   | Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|-----------|--------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|      |   |  On May 26, 2011, we announced that Stephen W. Lake has been elected general counsel to succeed John R. Barker when he retires on December 31, 2011.Lake, 47, will join ONEOK, Inc. (ONEOK) on July 1, 2011, as senior vice president, associate general counsel and assistant secretary, reporting to John Barker. Upon Barker’s retirement, Lake will become senior vice president, general counsel and assistant secretary of ONEOK and ONEOK Partners GP, L.L.C. (ONEOK Partners GP), the sole general partner of ONEOK Partners, L.P., reporting to John W. Gibson, chairman, president and chief executive officer of ONEOK and ONEOK Partners GP.Upon joining ONEOK, Mr. Lake will be eligible to participate in the benefit plans described under the “Compensation Discussion and Analysis” on pages 37 through 56 of ONEOK, Inc.’s Proxy Statement relating to its 2011 Annual Meeting of Shareholders, as filed with the United States Securities and Exchange Commission on April 4, 2011 (and such descriptions are incorporated herein by this reference).A copy of the news release, including Mr. Lake’s biographical information, is attached and is incorporated herein by reference. |
| Item 9.01 |   | Financial Statements and Exhibits Exhibit 99.1    News release issued by ONEOK, Inc. and ONEOK Partners, L.P. dated May 26, 2011.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |

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|   |         |   | ONEOK Partners, L.P.By:  ONEOK Partners GP, L.L.C., General Partner |
|--------|--------------|--------|-------------------------------------------------------------------------------|
|   |         |   |                                                                          |
| Date:  | June 1, 2011 | By:    | /s/ Robert F. MartinovichRobert F. Martinovich                                |
|   |         |   | Senior Vice President,Chief Financial Officer andTreasurer               |