When Tomorrow Comes is a 1939 American romantic melodrama film directed by John M. Stahl, and starring Irene Dunne and Charles Boyer. The screenplay concerns a waitress who falls in love with a man who later turns out to be a married concert pianist. Bernard B. Brown won the Academy Award for Best Sound.

A scene in the film where the two protagonists take refuge from a storm in a church was the subject of Cain v. Universal Pictures, a case in which the writer James M. Cain sued Universal Pictures, the scriptwriter and the director for copyright infringement. Judge Leon Rene Yankwich ruled that there was no resemblance between the scenes in the book and the film other than incidental "scènes à faire", or natural similarities due to the situation, establishing an important legal precedent.