Filmsite

Main Film Genres(click here)		Film Sub-Genres(click here)		Other Categories  (click here)
	Action Films		Biographical Films (or "Biopics")		Animated Films
	Adventure Films		'Chick' Flicks		British (UK Films)
	Comedy Films		Courtroom Dramas		Childrens - Kids - Family-Oriented Films
	Crime & Gangster Films		Detective & Mystery Films		Classic Films
	Drama Films		Disaster Films		Cult Films
	Epics/Historical Films		Fantasy Films		Documentary Films
	Horror Films		Film Noir		Serial Films
	Musicals (Dance) Films		Guy Films		Sexual - Erotic Films
	Science Fiction Films		Melodramas, Women's or "Weeper" Films		Silent Films
	War (Anti-War) Films		Road Films
	Westerns		Romance Films
			Sports Films
			Superhero Films
			Supernatural Films
			Thriller-Suspense Films
			Zombie Films

Source:

http://www.filmsite.org/filmgenres.html