'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.

Originally released in the US in 2011, this is the first time this album has been released locally in Australia.