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, and his partner Harry Longabaugh, the "Sundance Kid", who are on the run from a crack US posse after a string of train robberies. The pair and Sundance's lover, Etta Place, flee to Bolivia to escape the posse.

Harry Alonzo Longabaugh, better known as the Sundance Kid, was an outlaw and member of Butch Cassidy's Wild Bunch in the American Old West. He likely met Butch Cassidy during a hunting trip in 1883 or earlier. The "Wild Bunch" gang performed the longest string of successful train and bank robberies in American history.