Summer Holiday is a 1948 American musical-comedy film, directed by Rouben Mamoulian and starring Mickey Rooney and Gloria DeHaven. The picture is based on the play Ah, Wilderness! (1933) by Eugene O'Neill, which had been filmed under that name by MGM in 1935 with Rooney in a much smaller role, as the younger brother. Although completed in October 1946, the film sat on the shelf until 1948.

In addition to Walter Huston, the supporting cast features Frank Morgan as the drunken Uncle Sid, (a role originated in the stage play by Gene Lockhart, portrayed onscreen by Wallace Beery in 1935 and later by Jackie Gleason on Broadway) as well as Marilyn Maxwell, Agnes Moorehead, Selena Royle and Anne Francis. One of producer Arthur Freed's MGM musicals, it has costumes and cinematography that take full advantage of Technicolor.