Félix Manuel Díaz Guzman (born 10 December 1983) is a Dominican professional boxer who challenged for the unified WBC, WBO, and The Ring light welterweight titles in 2017.

As an amateur he won a gold medal at the 2008 Olympics and bronze at the 2003 Pan American Games.

The aggressive Southpaw brawler participated in the 2004 Summer Olympics for his native Caribbean country.

There he lost 28:16 in the first round of the Lightweight (60 kg) division to Kazakhstan's eventual bronze medalist Serik Yeleuov.

It was the nation's second ever Olympic gold after Félix Sánchez in 2004 and the second boxing medal after Pedro Nolasco won a bronze in Los Angeles in 1984.