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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