CSY may refer to:
Caribbean Sailing Yachts, known as CSYs, are heavy-displacement recreational sailboats built during the 1970s and 1980s in Tampa, Florida.
Chartered Security Professional (CSyP) is a professional certification in security offered by the Worshipful Company of Security Professionals, a livery company in the City of London.
In the past, the Certificate of Sixth Year Studies (CSYS) was the highest level of qualification available to pupils in the Scottish secondary education system.
Natashquan (Lac de l'Avion) Water Aerodrome, (TC LID: CSY8), is a private airport located 2.5 nautical miles (4.6 km; 2.9 mi) southeast of Natashquan, Quebec, Canada.
Saint-Donat Aerodrome, (TC LID: CSY4), is located at Saint-Donat, Quebec, Canada. Although the runway is primarily composed of sand and gravel, the centre 30 ft (9 m) is made of Asphalt.
Sorel Airport (TC LID: CSY3) is located 4 nautical miles (7.4 km; 4.6 mi) in Saint-Robert, Quebec, Canada, southeast of Sorel-Tracy.
The syntax of the C programming language, the rules governing writing of software in the language, is designed to allow for programs that are extremely terse, have a close relationship with the resulting object code, and yet provide relatively high-level data abstraction.
Dr. C. Sylendra Babu IPS (born 5 June 1962) is an Indian Police Service Officer of the 1987 batch belonging to the Tamil Nadu cadre.
In physics, C-symmetry means the symmetry of physical laws under a charge-conjugation transformation. Electromagnetism, gravity and the strong interaction all obey C-symmetry, but weak interactions violate C-symmetry.