Donald Siegel (October 26, 1912 – April 20, 1991) was an American film director and producer. His name variously appeared in the credits of his films as both Don Siegel and Donald Siegel. He is best known for the original sci-fi film Invasion of the Body Snatchers (1956), as well as five films with Clint Eastwood, including the police thriller Dirty Harry (1971) and the prison drama Escape from Alcatraz (1979), and John Wayne's final film the 1976 Western The Shootist.