Which 1941 film is Alfred Hitchcock's only pure comedy?

Mr. & Mrs. Smith is the 1941 film commonly described as Alfred Hitchcock’s only pure comedy.

The film is an American screwball comedy starring Carole Lombard and Robert Montgomery as Ann and David Smith, a married couple who learn that a legal mistake may have invalidated their marriage. Instead of simply remarrying, they quarrel, separate, and repeatedly find themselves drawn back together.

The project began with writer Norman Krasna, who developed the basic premise and pitched it to Lombard. Hitchcock became involved after the project reached RKO, fulfilling his interest in working with Lombard. Unlike Hitchcock’s better-known suspense films, this production focuses on romantic conflict, farce, misunderstandings, and comic reversals.

The phrase “only pure comedy” is usually qualified as the only one Hitchcock made in the United States. Hitchcock was reportedly dissatisfied with the finished film, but it remains distinct from works such as The 39 Steps and The Lady Vanishes, which blend comedy with suspense or espionage.