Guadalcanal Diary is a 1943 World War II war film directed by Lewis Seiler, featuring Preston Foster, Lloyd Nolan, William Bendix, Richard Conte, Anthony Quinn and the film debut of Richard Jaeckel. It is based on the book of the same name by Richard Tregaskis.

The film recounts the fight of the United States Marines in the Battle of Guadalcanal, which occurred only a year before the movie's release. While the film has notable battle scenes, its primary focus is on the characters and back stories of the Marines.

The movie was produced by Bryan Foy, who also produced Berlin Correspondent (1942), Chetniks! The Fighting Guerrillas (1943), and PT 109 (1963).