King Diamond is a Danish heavy metal band formed in 1985 by vocalist King Diamond, guitarists Andy LaRocque and Michael Denner, bassist Timi Hansen and drummer Mikkey Dee. Diamond, Denner and Hansen had recently departed the group Mercyful Fate, and decided to form a new band under the King Diamond moniker, as it was already known from the Mercyful Fate days. In 1985, King Diamond released their debut album Fatal Portrait. Since then the band have released a total of twelve studio albums (most of them concept albums), two live albums, two extended plays, five compilations and five singles.

Since the band's inception, there have been over fifteen musicians in and out of King Diamond, with the only two mainstays being vocalist King Diamond and guitarist Andy LaRocque. In 1987 the band released their second studio release Abigail (their first concept album). Throughout the 1980s, King Diamond released a total of four studio albums. In the early 90's, the band was put on hold when King Diamond reunited with his former outfit Mercyful Fate. After reforming King Diamond in 1994, Diamond would balance recording and touring with both Mercyful Fate and his eponymous band throughout the 90's. Since the early 2000s, King Diamond have kept recording and touring and since 2001 the band has been composed of vocalist King Diamond, guitarist Andy LaRocque, guitarist Mike Wead, bassist Hal Patino and drummer Matt Thompson.