Butch Cassidy and the Sundance Kid is a 1969 American Western buddy film directed by George Roy Hill and written by William Goldman. Based loosely on fact, the film tells the story of Wild West outlaws Robert LeRoy Parker, known as Butch Cassidy (Paul Newman), and his partner Harry Longabaugh, the "Sundance Kid" (Robert Redford), who are on the run from a crack US posse after a string of train robberies. The pair and Sundance's lover, Etta Place (Katharine Ross), flee to Bolivia to escape the posse.

The film was released on September 24, 1969 and initially received lukewarm reviews from critics, but over the years it has since garnered some retrospective reappraisal. In 2003, the film was selected for preservation in the United States National Film Registry by the Library of Congress as being "culturally, historically, or aesthetically significant". The American Film Institute ranked Butch Cassidy and the Sundance Kid as the 73rd-greatest American film on its "AFI's 100 Years...100 Movies (10th Anniversary Edition)" list, and number 50 on the original list. Butch Cassidy and the Sundance Kid were ranked 20th-greatest heroes on "AFI's 100 Years...100 Heroes & Villains". Butch Cassidy and the Sundance Kid was selected by the American Film Institute as the 7th-greatest Western of all time in the AFI's 10 Top 10 list in 2008.