Arch Enemy is a Swedish melodic death metal band, originally a supergroup, from Halmstad, formed in 1996. Its members were in bands such as Carcass, Armageddon, Carnage, Mercyful Fate, Spiritual Beggars, and Eucharist. It was founded by Carcass guitarist Michael Amott along with Johan Liiva, who were both originally from the influential death metal band Carnage. The band has released nine studio albums, two live albums, three video albums and three EPs. The band was originally fronted by Johan Liiva, who was replaced by German Angela Gossow as lead vocalist in 2000. Gossow left the band in March 2014 and was replaced by Canadian Alissa White-Gluz, while remaining as the group's manager.

ArchEnemy is a 2009 science-fiction and fantasy novel by Frank Beddor and the third novel of the Looking Glass Wars trilogy. The book was published on October 15, 2009 by Dial Press and is heavily inspired by Lewis Carroll's Alice's Adventures in Wonderland and Through the Looking-Glass.

An archenemy, archfoe, archvillain, or nemesis (sometimes spelled arch-enemy, arch-foe, or arch-villain) is the principal enemy of someone or something. In fiction, it is a character who is the hero/protagonist's worst enemy.