Wilmer C. "Bill" Butler, ASC (born April 7, 1921) is an American cinematographer. He shot The Conversation (1974), Jaws (1975), and three Rocky sequels. He completed 1975's One Flew Over the Cuckoo's Nest after Haskell Wexler was fired from the production, and was subsequently nominated for an Academy Award for Best Cinematography. Wilmer C. Butler was born on April 7, 1921 in Cripple Creek, Colorado. Butler spent the first five years of his life living in a log cabin on a homestead in Colorado, where his parents were farmers. He moved with his parents to Henry County when he was 5 years old and mainly was raised in Mount Pleasant, Iowa, a small college town. Also at the age of 5, he saw The Jazz Singer (1927). He graduated from Mount Pleasant High School in 1940. He graduated with a degree in engineering from the University of Iowa. Butler began his career as an engineer at a radio station in Gary, Indiana. He subsequently moved to Chicago, where he helped design and build the first television stations at the ABC affiliate and later at WGN-TV. When WGN went on the air, Butler operated a live video camera for commercials and for locally produced programs. At his tenure with WGN, Butler met William Friedkin. Friedkin asked Butler to be his cinematographer on The People vs. Paul Crump, a documentary that focused on a prisoner who was slated for execution in Illinois. It was a docudrama that resulted in the governor of Illinois' commuting the prisoner's death sentence. "I was very successful in television, so I had no reason to go into film," Butler said. "But I knew Bill Friedkin was interested in making a film documentary, and he needed a cinematographer. He asked me to assist him. And I did." As a result, Butler's interest shifted from live television to film documentaries. In a 2005 interview, Butler credited Friedkin for giving him his first actual job in the film industry.

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