“Mr. Crowley” is a song by British heavy metal vocalist Ozzy Osbourne about English occultist Aleister Crowley. It was first released on Osbourne’s debut solo album Blizzard of Ozz in September 1980 in the United Kingdom, and then a live version of the song was released as a single in November 1980. The song was written by Osbourne, guitarist Randy Rhoads, and bass guitarist/lyricist Bob Daisley.
The song starts with a keyboard solo by Don Airey. The guitar solo by Randy Rhoads after the second strophe became one of the most known in heavy metal. It was ranked on 28th place in the list of the best guitar solos by the readers of Guitar World.