A Most Immoral Lady is a 1929 American sound (All-Talking) drama film directed by John Griffith Wray and written by Forrest Halsey. It is based on the 1928 play A Most Immoral Lady by Townsend Martin. The film stars Leatrice Joy, Walter Pidgeon, Sidney Blackmer, Montagu Love, Josephine Dunn, and Robert Edeson. The film was released by Warner Bros. Pictures on September 22, 1929.