SY

SY may refer to:
* The IATA code for Sun Country Airlines
* The ISO 3166-1 alpha-2 country code for Syria
* UK postal code area SY (Shrewsbury area)
* Sy, Ardennes, a commune in France
* Sy (DJ), a British hardcore techno producer and DJ
* SY Telecom, a hands free and earphone manufacturer
* Sonic Youth, noise rock band.
* Steam yacht, a type of ship.

People:
* Baba Sy, Senegalese draughts player
* Chan Sy, Cambodian politician
* Frédéric Sy, French astronomer
* Henry Sy, Filipino businessman
* Moussa Sy, Guinean footballer
* Ousmane Sy, Malian politician
* Sy Liebergot, retired NASA flight controller