Interlude is a 1957 American CinemaScope drama romance film directed by Douglas Sirk and starring June Allyson and Rossano Brazzi.

The film is a reworking of When Tomorrow Comes, a 1939 film starring Irene Dunne and Charles Boyer. Both films were based on a novel by James M. Cain. Sirk cited Serenade as the title of that book, but in March 2014, in a long article for Senses of Cinema in which he discussed all three works, critic Tom Ryan points out that Kristopher Mecholsky reveals that both films are based on Cain's The Root of His Evil.

The film was later remade and released in 1968 under the same title. Directed by Kevin Billington it starred Oskar Werner, Barbara Ferris and Virginia Maskell.