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
This disambiguation page lists articles associated with the title CSY.
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