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
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