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 station, a Paris Metro station, located near the Place du Châtelet Châtelet–Les Halles station, a major RER 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