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''Diary of a Madman'' (story), a short story by Nikolai Gogol.

''Diary of a Madman'' (album), a music album by Ozzy Osbourne.

"Diary of a Madman" (song), the title track on Ozzy Osbourne's album Diary of a Madman.

''Diary of a Madman'' (film), a movie (1963) directed by Reginald Le Borg, starring Vincent Price and Nancy Kovack. The film was based on the short story "Le Horla" by Guy de Maupassant.

A Madman's Diary (known in Chinese as Kuangren riji (狂人日記) is the name of a short story by Lu Xun.