The discography of Def Leppard, an English-based hard rock band, consists of 10 studio albums, three compilation albums, one extended play (EP), 50 singles, 34 music videos, and eight videos. This list does not include material recorded by Def Leppard sideprojects. Def Leppard were formed in 1977 by vocalist Joe Elliott and later released their only EP to date entitled The Def Leppard E.P. in 1979. The band signed with the independent label Mercury Records and released their debut full-length album On Through the Night. The band's follow up was High 'n' Dry which reached number 26 in the UK and was certified platinum two times in the United States. Their next album entitled, Pyromania, would be their big breakthrough album and would later sell more than 10 million copies in the United States alone. After touring for the support of Pyromania, the band released Hysteria which topped the American chart and the British chart and is their best-selling album worldwide, selling more than 12 million copies in the United States alone and over 20 million worldwide .

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