Bad Sister is a 1931 American Pre-Code drama film directed by Hobart Henley. The screenplay by Edwin H. Knopf, Tom Reed, and Raymond L. Schrock is based on the 1913 novel The Flirt by Booth Tarkington, which had been filmed in 1916 and 1922. The film marks the screen debuts of Bette Davis and Sidney Fox, who was billed over Davis. It also features Humphrey Bogart and ZaSu Pitts in supporting roles. This film has been preserved in the Library of Congress collection.