Black hat

Black hat may refer to:

 Black hat (film), a movie's villain or bad guy, especially one that actually wears a black hat
 Black hat hacking, Internet slang for someone breaking computer or Internet security
 Black Hat Briefings,  a computer security conference
 the Iron Brigade, also known as the Black Hat Brigade, an infantry brigade during the American Civil War
 "Black Hat" Lamas, a term used in Buddhism, in reference to the Black Crown worn by the Karmapa
 Haredi Jews, whose men wear black hats and coats
 Fear of a Black Hat, a 1994 American mockumentary movie