The Indiana Jones Grail Diary is a movie prop created in 1989 for the film Indiana Jones and the Last Crusade. It contained several sketches, illustrations and notes, as well as some inserts kept by Henry Jones. Much of the text was taken from the book The Grail: Quest for the Eternal, written by John Matthews.
A minimalistic replica of the Grail Diary was part of the package of the video game Indiana Jones and the Last Crusade: The Graphic Adventure in 1989, as part of the game's copy-protection.