EX-99.906 CERT


                     CERTIFICATION PURSUANT TO SECTION 906
                           OF THE SARBANES OXLEY ACT

The undersigned hereby certifies, to the best of his knowledge, that:

         1)       The Form N-CSR of Longleaf Partners Funds Trust (the
                  "Issuer") and its separate series for the period ended
                  December 31, 2006 (the "Report") fully complies with the
                  requirements of Section 13(a) or 15(d) of the Securities
                  Exchange Act of 1934, as applicable; and

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


By       /s/ O. Mason Hawkins                        Date:    February 23, 2007
         ---------------------------                          -----------------
         O. Mason Hawkins
         Chairman and CEO, Southeastern Asset Management, Inc.
         Functioning as principal executive officer under agreements with
         Longleaf Partners Funds Trust and its separate series

The undersigned hereby certifies, to the best of her knowledge, that:

         1)       The Form N-CSR of Longleaf Partners Funds Trust (the
                  "Issuer") and its separate series for the period ended
                  December 31, 2006 (the "Report") fully complies with the
                  requirements of Section 13(a) or 15(d) of the Securities
                  Exchange Act of 1934, as applicable; and

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

By       /s/ Julie M. Douglas                        Date:    February 23, 2007
         --------------------                                 -----------------
         Julie M. Douglas
         Vice President & CFO - Mutual Funds, Southeastern Asset Management,
         Inc. Functioning as principal financial officer under agreements with
         Longleaf Partners Funds Trust and its separate series

This certification is being furnished solely pursuant to 18 U.S.C. 1350 and is
not being filed as part of the Report or as a separate disclosure document.

A signed original of this written statement has been provided to Longleaf
Partners Funds Trust and will be retained by Longleaf Partners Funds Trust and
furnished to the Securities and Exchange Commission or its staff upon request.