CYS

'''CYS''' or '''Cys''' may refer to:

* Cysteine, an amino acid abbreviated Cys * Cheyenne Regional Airport, Wyoming, United States, IATA and FAA LID airport code * Cathays railway station, Cardiff, Wales, station code * California Youth Symphony, a San Francisco Bay Area symphony orchestra for young musicians * Cyprus Organization for Standardization, the Cyprus national standardization body * Cys Kurland, footballer who played for the South African national side in 1947

==See also== * Cys-la-Commune, a French commune

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