CYA

CYA may stand for:


 * California Youth Authority, now California Division of Juvenile Justice
 * Canadian Yachting Association, now Sail Canada
 * College Year in Athens, an U.S. study abroad program
 * Cover your ass, a defensive practice against legal penalties or criticism
 * Cyanuric acid, a chemical compound
 * ya, meaning "radiocarbon years ago" in calibration of radiocarbon dates
 * CYA, the IATA code for Antoine-Simon Airport, Haiti