Wilmer Cable Butler was an American cinematographer who was known for his work on The Conversation (1974), Jaws (1975), and three Rocky sequels. Butler also completed One Flew Over the Cuckoo's Nest (1975) after Haskell Wexler was fired from the production, and was subsequently nominated for an Academy Award for Best Cinematography.

One Flew Over the Cuckoo's Nest is a 1975 American psychological drama film directed by Miloš Forman, based on the novel One Flew Over the Cuckoo's Nest by Ken Kesey. The film stars Jack Nicholson as a new patient at a mental institution, alongside Louise Fletcher as a sadistic nurse. The supporting cast is Will Sampson, Danny DeVito, Sydney Lassick, William Redfield, and the film debuts of Christopher Lloyd and Brad Dourif.