Out of the Past (billed in the United Kingdom as Build My Gallows High) is a 1947 film noir directed by Jacques Tourneur and starring Robert Mitchum, Jane Greer, and Kirk Douglas. The film was adapted by Daniel Mainwaring (using the pseudonym Geoffrey Homes), with uncredited revisions by Frank Fenton and James M. Cain, from his novel Build My Gallows High (also written as Homes).
Film historians consider Out of the Past a superb example of film noir due to its complicated, dark storyline, dark cinematography and classic femme fatale. The film's cinematographer Nicholas Musuraca also shot Tourneur's Cat People. In 1991, Out of the Past was added to the United States National Film Registry by the Library of Congress as being deemed "culturally, historically, or aesthetically significant."