Heresy is an album released in 1990 by the dark ambient musician Lustmord. A remastered version was issued in 2004.
Liner notes: "Heresy is the culmination of work carried out from 1987 to 1989 and utilizes subterranean location recordings originated within crypts, caverns, mines, deep shelters and catacombs together with material of seismic and volcanic origin. It also takes advantage of psycho-acoustic phenomena and the physical effects of low frequency information."
In 2010, Fact magazine described Heresy as "a classic, the crowning achievement of the "dark ambient" genre".