William Marshall (October 2, 1917 – June 8, 1994) was an American singer, bandleader and a motion picture actor, director and producer.

Born in Chicago, Illinois, he became a vocalist for Fred Waring and his band, the "Pennsylvanians " before forming his own band in 1937. In 1940 he went to Hollywood to act in films.

He was married three times. All his marriages were to actresses.

Michèle Morgan (1942–1948) - son Michael Marshall,
Micheline Presle (1950–1954) - daughter Tonie Marshall,
film director Ginger Rogers (1961–1969)

William Marshall died in Los Angeles in June 1994.