The Constant Nymph is a 1943 romantic drama film starring Charles Boyer, Joan Fontaine, Alexis Smith, Brenda Marshall, Charles Coburn, May Whitty, and Peter Lorre with a famous score by Erich Wolfgang Korngold. It was adapted by Kathryn Scola from the 1924 novel of the same name by Margaret Kennedy and the 1926 play by Kennedy and Basil Dean and directed by Edmund Goulding.