Tormentor is a Hungarian black metal band formed in 1986 in Budapest. They recorded their first album, Anno Domini, in 1988, but were unable to release it until the end of communist rule in Hungary. The album reached Norway through the tape-trading community. Following the suicide of Per Ohlin, Mayhem invited Attila Csihar from Tormentor to join the band; he was to perform the vocals on De Mysteriis Dom Sathanas. Tormentor split up in 1991. After a long break they reformed and released the more experimental Recipe Ferrum through Avantgarde Music in 2001, going on a long indefinite hiatus afterwards.

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