| Exhibit      12                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ONEOK      Partners, L.P.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Computation      of Ratio of Earnings to Fixed Charges                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   | Years      Ended December 31, |
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| (Unaudited)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |   | 2008 |   |   |   |   | 2007 |   |   |   |   | 2006 |   |   |   |   | 2005 |   |   |   |   | 2004 |   |   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   | (Thousands      of dollars) |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Fixed      Charges, as defined                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Interest      on long-term debt                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   | $ | 172,810 |   |   |   |   | $ | 146,046 |   |   |   |   | $ | 136,533 |   |   |   |   | $ | 90,066 |   |   |   |   | $ | 79,020 |   |   |   |
| Other      interest                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |   | 12,426 |   |   |   |   |   | 4,714 |   |   |   |   |   | 439 |   |   |   |   |   | 3 |   |   |   |   |   | 15 |   |   |   |
| Amortization      of debt discount, premiumand      expense                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |   |   | 1,942 |   |   |   |   |   | 1,765 |   |   |   |   |   | (2,294 | ) |   |   |   |   | (2,379 | ) |   |   |   |   | (1,690 | ) |   |   |
| Interest      on lease agreements                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |   |   | 6,341 |   |   |   |   |   | 6,392 |   |   |   |   |   | 5,605 |   |   |   |   |   | 1,522 |   |   |   |   |   | 1,192 |   |   |   |
| Total      Fixed Charges                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |   | 193,519 |   |   |   |   |   | 158,917 |   |   |   |   |   | 140,283 |   |   |   |   |   | 89,212 |   |   |   |   |   | 78,537 |   |   |   |
| Earnings      before income taxes and undistributedincome      of equity method investees                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |   |   | 618,848 |   |   |   |   |   | 417,305 |   |   |   |   |   | 501,595 |   |   |   |   |   | 189,042 |   |   |   |   |   | 190,245 |   |   |   |
| Earnings      available for fixed charges                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |   | $ | 812,367 |   |   |   |   | $ | 576,222 |   |   |   |   | $ | 641,878 |   |   |   |   | $ | 278,254 |   |   |   |   | $ | 268,782 |   |   |   |
| Ratio      of earnings to fixed charges                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |   | 4.20 |  x |   |   | 3.63 |  x |   |   | 4.58 |  x |   |   | 3.12 |  x |   |   | 3.42 |  x |
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| For      purposes of computing the ratio of earnings to fixed charges, "earnings"      consists of income before cumulative effect of a change in accounting      principle plus fixed charges, minority interests in income of consolidated      subsidiaries, income taxes and distributed income of equity method      investees, less capitalized interest and undistributed income of equity      method investees. "Fixed charges" consists of interest expensed and      capitalized, the amortization of debt discounts and issue costs and the      representative interest portion of operating leases. |   |