Châtelet or Chatelet may refer to: Châtelet, a type of large gatehouse, a fortified entry point of a castle Places Belgium Châtelet, Belgium, a municipality in the province of Hainaut France Grand Châtelet, a former stronghold with courts, police, and prisons on the site of the Place du Châtelet Place du Châtelet, a public square in Paris, on the right bank of the Seine on the border of the 1st and 4th arrondissements Théâtre du Châtelet, a theatre in Paris, on the Place du Châtelet Châtelet (Paris Métro), a Metro station in Paris, located near the Place du Châtelet Châtelet - Les Halles (Paris RER), the central commuter train station in Paris, attached to both the Châtelet and Les Halles metro stations Le Châtelet-sur-Meuse, a commune in Haute-Marne that is near the source of the Meuse Switzerland Le Châtelet (mountain), in Switzerland Other uses Châtelet surface, a surface in algebraic geometry People with the surname Albert Châtelet (1883–1960), French mathematician and politician Émilie du Châtelet (1706−1749), French mathematician, physicist, and author François Châtelet (1925−1985), French historian of political philosophy François Châtelet (mathematician) (1912–1987), French mathematician Gilles Châtelet (1944–1999), French philosopher and mathematician See also Châtelain (female chatelaine), the French title for the keeper of a castle Chastellet, a Templar castle lost to Saladin at the Siege of Jacob's Ford