"Mr Crowley" is a 1980 heavy metal song performed by Ozzy Osbourne, released on the album Blizzard of Ozz, Osbourne's first solo effort following his firing from Black Sabbath. It peaked at number 46 on the United Kingdom charts. Musicians playing on the song are guitarist Randy Rhoads, bass guitarist Bob Daisley, and drummer Lee Kerslake. Don Airey plays the song's distinctive organ introduction. In more recent Deep Purple shows, Airey will incorporate the song's intro into his keyboard solo spot.
The song is one of two singles ("Crazy Train" being the other) released from the Blizzard of Ozz album.