Sy is a given name, nickname and surname.

Sy or SY may also refer to:

Places Sy, Belgium, a town in the Ardennes Sy, Ardennes, a commune in France Sy, Mali, a small town and commune 1714 Sy, an asteroid SY postcode area, the British post code area for Shrewsbury Syria (ISO 3166-1 country code) .sy, the country code top level domain for Syria

Other uses Sonic Youth, an American rock band Office of Security, a former name for the U.S. State Department's Diplomatic Security Service China Railways SY, a Chinese class of industrial 2-8-2 steam locomotive SY or S/Y, a ship prefix for sailing yacht or steam yacht SY, Sun Country Airlines's IATA airline code SY, Sybase's New York Stock Exchange ticker symbol

See also Cy (disambiguation)