Castle on the Hudson (UK title: Years Without Days) is a 1940 American prison film directed by Anatole Litvak and starring John Garfield, Ann Sheridan and Pat O'Brien. The film was based on the book Twenty Thousand Years in Sing Sing, written by Lewis E. Lawes, on whom the warden (played by O'Brien) in the film was based. Castle on the Hudson is a remake of the 1932 Spencer Tracy prison film 20,000 Years in Sing Sing, also based on Lawes's book.