The Sin Ship is a 1931 American pre-Code drama film produced and distributed by RKO Radio Pictures and directed by the actor Louis Wolheim in his only directorial effort. The film marks the last contribution Wolheim made to the film industry prior to his death from cancer one month shy of his fifty-first birthday. In addition to directing, Wolheim also starred in the picture, alongside Mary Astor and Ian Keith. The screenplay was written by Hugh Herbert (who also acted in the film), from a story by Keene Thompson and Agnes Brand Leahy. The film was released in April 1931, two months after Wolheim's death, and is preserved at the Library of Congress.