August Underground is a 2001 American exploitation horror film directed by Fred Vogel, who co-wrote it with Allen Peters. The film stars Vogel as a serial killer named Peter, who kidnaps and kills several innocent people, while his unnamed accomplice, played by Peters, films and documents the murders.

Filmed in an intentionally amateurish found footage style, August Underground was met with mixed reviews. The film was followed by two sequels, August Underground's Mordum in 2003, and August Underground's Penance in 2007.