CERTIFICATIONS PURSUANT TO SECTION 906
EX-99.906CERT

CERTIFICATION

R. Jay Gerken, Chief Executive Officer, and Kaprel Ozsolak, Chief Financial Officer of Smith Barney Investment Funds Inc. – Smith Barney Small Cap Value Fund (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	Chief Financial Officer
Smith Barney Investment Funds Inc. -	Smith Barney Investment Funds Inc. -
Smith Barney Small Cap Value Fund	Smith Barney Small Cap Value Fund
/s/ R. Jay Gerken	/s/ Kaprel Ozsolak
R. Jay Gerken	Kaprel Ozsolak
Date: December 9, 2005	Date: December 9, 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.