René Rivera, (July 20, 1935 – September 26, 2013), known professionally as Mario Montez, was one of the Warhol superstars, appearing in thirteen of Andy Warhol's underground films from 1964 to 1966. He took his name as a male homage to the actress Maria Montez, an important gay icon in the fifties and sixties. Before appearing in Warhol's films, he appeared in Jack Smith's important underground films Flaming Creatures and Normal Love. Montez also stars in the Ron Rice film, Chumlum, made in 1964. Mario Montez, was "a staple in the New York underground scene of the 1960s and ’70s."

Credits