'Diary Of A Madman' is the second solo studio album by British heavy metal vocalist Ozzy Osbourne. It was originally released on 7 November 1981.

'Diary Of A Madman' has been referred to the album as "a classic rock record in every way", "lifted out of the ordinary by the legendary rock axe god, Randy Rhoads". 'Diary Of A Madman' is the final album recorded with late guitarist Randy Rhoads, and also represents Kerslake's final appearance with Osbourne.