Mario Díaz may refer to:
Mario Díaz (baseball) (born 1962), Major League Baseball infielder Mario Díaz (discus thrower) (born 1999), Cuban discus thrower Mario Díaz Martínez (born 1965), Spanish member of the World Scout Committee Mario Díaz (footballer, born 1960), Mexican football manager for Atletico Valladolid and former midfielder Mario Díaz (footballer, born 1961), Mexican football striker
See also Mario Díaz-Balart (born 1961), member of the U.S. House of Representatives from Florida Mario René Díaz Leyva (born 1951), Cuban photographer