When Tomorrow Comes is a 1939 American romantic melodrama film[3] directed by John M. Stahl, and starring Irene Dunne and Charles Boyer.

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.

Uncredited roles include Frances Robinson, Helen Lynd, Kitty McHugh, Florence Lake, Dorothy Granger, Mary Treen, Harry C. Bradley, Milton Parsons, Addison Richards, George Humbert, Milburn Stone, Frank Darien, Gaylord Pendleton, Mickey Kuhn, and Ed Peil.

[6] Charles Boyer and Irene Dunne had previously starred together in Love Affair, Leo McCarey's romantic dramedy distributed by RKO Pictures.

[10] Boyer noticed his character shared allusions to Love Affair's Michel Marnet and only accepted the role if he would receive the same pay (estimated $100,000) for his appearance.

[6] After the movie's release, Photoplay magazine's October issue featured two essays written by Boyer and Dunne about each other, in the style of a parlor game where a player who briefly left the room guesses the secret noun other contestants chose by asking questions like "If I were that person, what kind of car would I be?

[9] Audiences appreciated seeing another film with the Boyer and Dunne pairing so soon after the first,[6] but critical reaction was mixed to negative, seemingly not blaming the actors for their disdain.

Frank S. Nugent wrote, "Boyer, with the charm that has made him one of our few authentic Matinée idols, and Miss Dunne, always a pleasant and sincere performer, are unequal to the task of bringing life and conviction to James Cain's made-to-order script.

The Kansas City Times wrote, "[When Tomorrow Comes] does not have as much comedy in it as when Miss Dunne and Mr. Boyer presented last season when they co-starred in Love Affair.

[I]ndeed, [Stahl] has woven together the elements for a romance that is as near to actuality and as far from affection as that of the Love Affair starring effort of Boyer and Miss Dunne.