It Happened One Night is a 1934 American pre-Code romantic comedy film with elements of screwball comedy directed and co-produced by Frank Capra, in collaboration with Harry Cohn, in which a pampered socialite tries to get out from under her father's thumb and falls in love with a roguish reporter. The screenplay by Robert Riskin is based on the August 1933 short story "Night Bus" by Samuel Hopkins Adams, which provided the shooting title. Classified as a "pre-Code" production, the film is among the last romantic comedies created before the MPPDA began rigidly enforcing the 1930 Motion Picture Production Code in July 1934. It Happened One Night was released just four months prior to that enforcement.

Pre-Code Hollywood was an era in the American film industry that occurred between the widespread adoption of sound in film in the late 1920s and the enforcement of the Motion Picture Production Code censorship guidelines in 1934. Although the Hays Code was adopted in 1930, oversight was poor, and it did not become rigorously enforced until July 1, 1934, with the establishment of the Production Code Administration. Before that date, film content was restricted more by local laws, negotiations between the Studio Relations Committee (SRC) and the major studios, and popular opinion than by strict adherence to the Hays Code, which was often ignored by Hollywood filmmakers.