Mario Martínez (born 15 August 1965) is a former Mexican boxer best known for losing to fellow Mexican Julio César Chávez for a vacant world title. in 1984, it is said that such bout catapulted Chavez's career.
Martinez turned pro in 1980. He lost one of his early fights but KOd Roberto Castanon and Rolando Navarette in 1984 earning a title shot against Chavez who knocked him out. In 1985 he lost a close decision to Roger Mayweather. Later he was beaten by Azumah Nelson (twice), Jeff Fenech and Dingaan Thobela.