Carcer

Carcer may refer to:
 * Carcer (geomancy), a geomancy figure
 * Carcer City, a fictional city in Manhunt, Manhunt 2, and Grand Theft Auto
 * Carcer Dun, a villain in the Discworld series
 * Càrcer, a municipality in the province of Valencia, Spain
 * Tullianum, an ancient Roman prison