EXHIBIT 99.906CERT

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

I, William Ferri, Principal Executive Officer of UBS Multi-Strat Fund, L.L.C.
(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 9, 2011                   /s/ William Ferri
                                      ------------------------------------------
                                      William Ferri, Principal Executive Officer

I, Robert Aufenanger, Principal Financial Officer of UBS Multi-Strat Fund,
L.L.C. (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 9, 2011                   /s/ Robert Aufenanger
                                      ------------------------------------------
                                      Robert Aufenanger, Principal Financial
                                      Officer