CERTIFICATION PURSUANT TO RULE 30A-2(B) UNDER THE 1940 ACT AND
                     SECTION 906 OF THE SARBANES-OXLEY ACT

I, Jill McGruder, President of Touchstone Institutional Funds Trust (the
"Registrant"), certify that:

      1.    The Form N-CSR of the Registrant (the "Report") fully complies with
            the requirements of Section 13(a) or 15(d) of the Securities
            Exchange Act of 1934, as amended; and

      2.    The information contained in the Report fairly presents, in all
            material respects, the financial condition and results of operations
            of the Registrant.


Date:    March 3, 2008              /s/ Jill McGruder
     ----------------------      --------------------------------------
                                    Jill McGruder, President
                                    (principal executive officer)


I, Terrie Wiedenheft, Controller and Treasurer of Touchstone Institutional Funds
Trust (the "Registrant"), certify that:

      1.    The Form N-CSR of the Registrant (the "Report") fully complies with
            the requirements of Section 13(a) or 15(d) of the Securities
            Exchange Act of 1934, as amended; and

      2.    The information contained in the Report fairly presents, in all
            material respects, the financial condition and results of operations
            of the Registrant.


Date:    March 3, 2008             /s/ Terrie Wiedenheft
     ----------------------      -------------------------------------
                                   Terrie Wiedenheft, Controller and Treasurer
                                   (principal financial officer)