René Díaz is a retired Cuban hammer thrower. He won the gold medal at the 1986 Central American and Caribbean Junior Championships, the silver medal at the 1986 Pan American Junior Athletics Championships, the gold medal at the 1989 Central American and Caribbean Championships, the bronze medal at the 1990 Central American and Caribbean Games, and the bronze medal at the 1991 Pan American Games. He became Cuban champion in 1990 and 1991.