The Man in Half Moon Street is a 1945 science fiction romantic melodrama dealing with a man who retains his youth and cannot die, living throughout the ages. The plot is similar to Oscar Wilde's Picture of Dorian Gray, except that there are more logical explanations for the eternal youth of the main character. The film is based on a 1939 West End play of the same title by Barré Lyndon, and stars Nils Asther and Helen Walker with direction by Ralph Murphy.