The Big Sleep (1939) is a hardboiled crime novel by American-British writer Raymond Chandler, the first to feature the detective Philip Marlowe. It has been adapted for film twice, in 1946 and again in 1978. The story is set in Los Angeles.

Raymond Thornton Chandler was an American-British novelist and screenwriter. In 1932, at the age of forty-four, Chandler became a detective fiction writer after losing his job as an oil company executive during the Great Depression. His first short story, "Blackmailers Don't Shoot", was published in 1933 in Black Mask, a popular pulp magazine. His first novel, The Big Sleep, was published in 1939. In addition to his short stories, Chandler published seven novels during his lifetime. All but Playback have been made into motion pictures, some more than once. In the year before his death, he was elected president of the Mystery Writers of America.