Ranald MacDougall (March 10, 1915 – December 12, 1973) was an American screenwriter who scripted such films as Mildred Pierce (1945), The Unsuspected (1947), June Bride (1948), and The Naked Jungle (1954), and shared screenwriting credit for 1963's Cleopatra. He also directed a number of films, including 1957's Man on Fire with Bing Crosby and 1959's The World, the Flesh and the Devil, both of which featured actress Inger Stevens.

Born in Schenectady, New York, MacDougall came from an impoverished working-class family. His father was a crane operator and union organizer, whose frequent strikes forced MacDougall to leave school before finishing the eighth grade to help support the family. He held a variety of odd jobs and during the Great Depression found work as an usher at Radio City Music Hall.