Exhibit 32

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002



In connection  with the  Quarterly  Report of BOK  Financial  Corporation  ("BOK
Financial")  on Form 10-Q for the fiscal  period  ending  June 30, 2008 as filed
with the Securities and Exchange  Commission on the date hereof (the  "Report"),
we, Stanley A. Lybarger and Steven E. Nell,  Chief  Executive  Officer and Chief
Financial  Officer,  respectively,  of BOK  Financial,  certify,  pursuant to 18
U.S.C.  ss. 1350, as adopted  pursuant to ss. 906 of the  Sarbanes-Oxley  Act of
2002, that to our knowledge:


(1)  The Report fully complies with the  requirements  of Section 13(a) or 15(d)
     of the Securities Exchange Act of 1934; and

(2)  The information  contained in the Report fairly  presents,  in all material
     respects,  the  financial  condition  and  results  of  operations  of  BOK
     Financial as of, and for, the periods presented.


August 8, 2008



/s/ Stanley A. Lybarger
- --------------------------------
Stanley A. Lybarger
President
Chief Executive Officer
BOK Financial Corporation


/s/ Steven E. Nell
- --------------------------------
Steven E. Nell
Executive Vice President
Chief Financial Officer
BOK Financial Corporation