Fail Safe is a 1964 Cold War thriller film directed by Sidney Lumet, based on the 1962 novel of the same name by Eugene Burdick and Harvey Wheeler. It portrays a fictional account of a nuclear crisis. The film features performances by actors Henry Fonda, Dan O'Herlihy, Walter Matthau and Frank Overton. Larry Hagman, Fritz Weaver, Dom DeLuise and Sorrell Booke appeared in early film roles.
The 1962 novel Fail Safe was written over the course of 2 years.