Marat may refer to:
- People
- Jean-Paul Marat (1743–1793), Swiss-born scientist and physician and noted character of the French Revolution
- Allan Marat, Papua New Guinean politician
- Marat (name) for discussion of the given name
- Art and culture
- Marat/Sade, a 1963 play by Peter Weiss
- Marat/Sade (film), a 1967 film adaptation of the play by Adrian Mitchell
- The Death of Marat, a 1793 painting
- Il piccolo Marat, an opera
- Other
- Marat, Puy-de-Dôme, a commune of the Puy-de-Dôme département in France
- The Soviet battleship Marat, originally the Russian battleship Petropavlovsk (1911)
- HMS Belleisle (1795), formerly the French ship Marat (1794)