CERTIFICATION

R. Jay Gerken, Chief Executive Officer, and Robert J. Brault, Chief Financial Officer of Smith Barney Muni Funds – Massachusetts Money Market Portfolio (the “Registrant”), each certify to the best of his knowledge that:

1. The Registrant’s periodic report on Form N-CSR for the period ended September 30, 2005 (the “Form N-CSR”) fully complies with the requirements of section 15(d) of the Securities Exchange Act of 1934, as amended; and

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


Chief Executive Officer Smith Barney Muni Funds – Massachusetts Money Market Portfolio /s/ R. Jay Gerken R. Jay Gerken Date: December 7, 2005	Chief Financial Officer Smith Barney Muni Funds – Massachusetts Money Market Portfolio /s/ Robert J. Brault Robert J. Brault Date: December 7, 2005

This certification is being furnished to the Securities and Exchange Commission solely pursuant to 18 U.S.C. § 1350 and is not being filed as part of the Form N-CSR with the Commission.