CSY

CSY may refer to:


 * CSY is the ICAO airline designator for Shuangyang General Aviation Company, China
 * CSY is the IATA airport code for Cheboksary Airport, Russia
 * CSY is the National Rail station code for Coseley railway station, England
 * Central Siberian Yupik language, one of the four Yupik languages. It is spoken also on St. Lawrence Island