UFC 39: The Warriors Return was a mixed martial arts event held by the Ultimate Fighting Championship on September 27, 2002, at the Mohegan Sun Arena in Uncasville, Connecticut.

Originally Ricco Rodriguez was scheduled to fight Josh Barnett for the UFC title but Barnett was stripped following a positive test for steroids.

The event marked the octagon debut of future UFC Heavyweight Champion Tim Sylvia.

This fight saw Sylvia's opponent, Wesley Correira, take several straight punches, knees, and kicks to the head without ever falling before his corner eventually threw in the towel.

Penn vs. Caol Uno ended in a split draw.