A biohazard, or biological hazard, is a biological substance that poses a threat to the health of living organisms.
Biohazard may also refer to:
Biohazard (band), an American band Biohazard (1988 demo tape) Biohazard (album), 1990 Biohazard (book), a 1999 non-fiction book by Ken Alibek Biohazard (film), a 1985 science-fiction horror film BioHazard, a combat robot Resident Evil, known in Japan as Biohazard, a Japanese horror media franchise Resident Evil (1996 video game), the first game in the series, known as Bio Hazard in Japan Resident Evil (2002 video game), a remake of the above game, known as Biohazard in Japan Resident Evil 7: Biohazard, a 2017 video game
See also Bio-Hazard Battle, a 1992 video game Biohazzard Records, a German independent record label