Blizzard of Ozz is the debut studio album by British heavy metal vocalist Ozzy Osbourne, released on 20 September 1980 in the UK and on 27 March 1981 in the US. The album was Osbourne's first release following his firing from Black Sabbath in 1979. Blizzard of Ozz is the first of two studio albums Osbourne recorded with guitarist Randy Rhoads prior to Rhoads' death in 1982. In 2017, it was ranked 9th on Rolling Stone's list of "100 Greatest Metal Albums of All Time".
 
The album tracks "Crazy Train" and "Mr. Crowley" were released as singles in 1980. "Crazy Train" went on to peak that year at number 9 on Billboard's Top Tracks chart. In January 2009, the song achieved a 2× Platinum certification status. Though it received little radio airplay upon its initial release, "Crazy Train" has become one of Osbourne's signature songs and a staple of classic rock radio playlists over the ensuing years.
 
The album was a commercial success, being certified 4× Platinum in the U.S. in 1997, a feat Osbourne would not achieve again until No More Tears was certified in 2000. In 2019 it was certified 5× Platinum. In the UK, it was the first of four Osbourne albums to attain Silver certification (60,000 units shipped) by the British Phonographic Industry, achieving this in August 1981. It also ranked 13th on a Guitar World readers poll of the "100 Greatest Guitar Albums of All Time." In his autobiography, Osbourne readily admitted that at the time the album was being recorded, he felt he was in direct competition with his former band, Black Sabbath.