HCY may refer to:
- Homocysteine, an amino acid
- Hôpital Central de Yaoundé, a Cameroonian hospital
- Tsuen Wan Public Ho Chuen Yiu Memorial College, a Hong Kong secondary school
- Helios Airways, a Cypriot airline (1998–2006; ICAO:
HCY)
This disambiguation page lists articles associated with the title HCY.
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