2 Answers

No, it wasn’t. Read Wiki:  One Flew Over the Cuckoo's Nest is a 1975 American drama film directed by Miloš Forman, based on the 1962 novel One Flew Over the Cuckoo's Nest by Ken Kesey, and starring Jack Nicholson and Louise Fletcher. The supporting cast features William Redfield, Will Sampson, Brad Dourif, Danny DeVito, Christopher Lloyd, and Scatman Crothers.
The film was the second to win all five major Academy Awards (Best Picture, Actor in Lead Role, Actress in Lead Role, Director, and Screenplay) following It Happened One Night in 1934, an accomplishment not repeated until 1991 by The Silence of the Lambs.
The film is #33 on the American Film Institute's 100 Years... 100 Movies list. It was shot at Oregon State Hospital in Salem, Oregon, which was also the setting of the novel.[3]