Candace June Clark is an American actress and model. She is best known for her role as Debbie Dunham in the 1973 film American Graffiti, for which she received a nomination for the Academy Award for Best Supporting Actress, and her role as Mary Lou in the 1976 film The Man Who Fell to Earth.

American Graffiti is a 1973 American coming-of-age comedy-drama film directed by George Lucas, produced by Francis Ford Coppola, written by Willard Huyck, Gloria Katz and Lucas, and starring Richard Dreyfuss, Ron Howard, Paul Le Mat, Harrison Ford, Charles Martin Smith, Cindy Williams, Candy Clark, Mackenzie Phillips, Bo Hopkins, and Wolfman Jack. Set in Modesto, California, in 1962, the film is a study of the cruising and early rock 'n' roll cultures popular among Lucas's age group at that time. Through a series of vignettes, it tells the story of a group of teenagers and their adventures over the course of a single night.