You Gotta Stay Happy is a 1948 American romantic comedy film directed by H.C. Potter and starring Joan Fontaine, James Stewart and Eddie Albert. It was distributed by Universal-International and produced by Karl Tunberg. The film was written by Karl Tunberg and Robert Carson and was released on November 4, 1948. The story tells of a marital ruckus that causes pilot Marvin Payne to become enmeshed in the world of New York heiress Miss Diana Dillwood.

Joan de Beauvoir de Havilland, known professionally as Joan Fontaine, was an English-American actress who is best known for her starring roles in Hollywood films during the Golden Age of Hollywood. Fontaine appeared in more than 45 films in a career that spanned five decades. She was the younger sister of actress Olivia de Havilland. Their rivalry was well-documented in the media at the height of Fontaine's career.