Ronald Stein (April 12, 1930 – August 15, 1988) was an American film composer.
Born in St. Louis, Missouri, Stein wrote scores for many low budget horror and exploitation films during the 1950s and 1960s, most of which were released by American International Pictures. These included It Conquered the World, Attack of the Crab Monsters, Invasion of the Saucer Men, Attack of the 50 Foot Woman, Hot Rod Gang, The Premature Burial and The Haunted Palace. He also provided scores for major studio productions such as Francis Ford Coppola's The Rain People, and Richard Rush's Getting Straight.
Stein taught composition at California State University, Northridge. Stein also taught composition, arranging, orchestration and theory at the University of Colorado Denver in the mid to late 1980s.
His song "Pigs Go Home" was sampled by rapper Eminem for his song "Guilty Conscience".
Stein died from pancreatic cancer.