Pentagram is an American heavy metal band from Alexandria, Virginia, most famous as one of the pioneers of heavy metal, and the sub-genre of doom metal in particular. As such, they are considered one of the "big four of doom metal," alongside Candlemass, Saint Vitus and Trouble. The band was prolific in the underground scene of the 1970s, producing many demos and rehearsal tapes, but did not release a full-length album until re-forming in the early 1980s with an almost completely new line-up. Throughout the band's history, the only constant member has been vocalist Bobby Liebling. The revolving line-up of Pentagram has featured many well-respected musicians in the local doom metal scene, with members spending time in other acts such as the Obsessed, Place of Skulls, Internal Void, Spirit Caravan, among many others. The band's current line-up consists of Liebling (vocals), Matt Goldsborough (guitar), Greg Turley (bass), and "Minnesota" Pete Campbell (drums).

Doom metal is an extreme subgenre of heavy metal music that typically uses slower tempos, low-tuned guitars and a much "thicker" or "heavier" sound than other heavy metal genres. Both the music and the lyrics are intended to evoke a sense of despair, dread, and impending doom. The genre is strongly influenced by the early work of Black Sabbath, who formed a prototype for doom metal. During the first half of the 1980s, a number of bands such as Witchfinder General and Pagan Altar from England, American bands Pentagram, Saint Vitus, the Obsessed, Trouble, and Cirith Ungol, and Swedish band Candlemass defined doom metal as a distinct genre. Pentagram, Saint Vitus, Trouble and Candlemass have been referred to as "the Big Four of Doom Metal".