"Crazy Train" is the first single from British heavy metal vocalist Ozzy Osbourne's debut solo album, Blizzard of Ozz, released in 1980. A live version of the song recorded in 1981 from the album Tribute was also released as a single in 1987 with an accompanying music video. The song was written by Osbourne, Randy Rhoads and Bob Daisley. The subject matter of the lyrics is the Cold War and the fear of annihilation that existed during this period.

The song's main guitar riff has been praised for its use of the full minor scale. It reached No. 49 on the United Kingdom singles chart and No. 9 on the Billboard Top Tracks chart in 1981. The master ringtone was certified double platinum and had by September 2010 sold 1,750,000 downloads.

The song is one of Osbourne's most well known and recognizable as a solo performer. It was rated 9th greatest guitar solo ever by readers of Guitar World magazine. The song was also ranked 9th by VH1 on the list of the 40 Greatest Metal Songs and in 2009 it was named the 23rd greatest hard rock song of all time also by VH1, the highest placement by a solo artist on the list.

1980 Studio version

1987 Live version

"2002 re-issue"

"Crazy Train" has been sampled in the following songs:

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