"Crazy Train" is the debut solo single by English heavy metal singer Ozzy Osbourne, released in 1980 from his debut album as a solo artist, Blizzard of Ozz (1980). The song was written by Osbourne, Randy Rhoads, and Bob Daisley. The lyrics deal with the subject of the Cold War and the fear of annihilation that existed during that period. On its original release, "Crazy Train" reached the top 50 in the UK. Following Osbourne's death in 2025, the song entered the Hot 100 for the first time at number 46 and later peaked at number 39, becoming Osbourne's second US top 40 hit as a solo artist after "Mama, I'm Coming Home".