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 14Cya, meaning "radiocarbon years ago" in calibration of radiocarbon dates CYA, the IATA code for Antoine-Simon Airport, Haiti CyA, a South Korean musician now known by his birth name Giuk.