The First Legion is a 1951 American drama film directed by Douglas Sirk and written by Emmet Lavery. The film stars Charles Boyer, William Demarest, Lyle Bettger, Walter Hampden, Barbara Rush, Wesley Addy, H. B. Warner and Leo G. Carroll. The film was released on April 27, 1951, by United Artists. The film was based on Lavery's play of the same name, which opened on Broadway at the 46th Street Theatre on October 1, 1934. The play, which had no female characters, moved to the Biltmore Theater where it closed January 5, 1935.