The Constant Nymph is a 1943 film which tells the story of a teenaged girl who falls in love with a family friend who eventually marries her cousin. The two girls show mutual jealousy over their common love for the man. It stars Charles Boyer, Joan Fontaine, Brenda Marshall, Alexis Smith, Charles Coburn, Dame May Whitty and Peter Lorre.

The movie was Kathryn Scola from the play by Basil Dean and Margaret Kennedy from the novel by Kennedy. It was directed by Edmund Goulding.

It was nominated for the Academy Award for Best Actress (Joan Fontaine).

The movie had been made previously in 1934, adapted by Dorothy Farnum and directed by Dean. It stars Victoria Hopper, Brian Aherne and Leonora Corbett.

It had also previously been made in 1928, adapted by Adrian Brunel and Alma Reville and directed by Brunel and Basil Dean. It stars Ivor Novello, Mabel Poulton and Benita Hume.