HCS may refer to:
Education Various countries Heritage Christian School (disambiguation) Holy Cross School (disambiguation)
Australia Hallett Cove School, in Adelaide, South Australia Heritage College Sydney, in New South Wales
India Hooghly Collegiate School, in West Bengal
United Kingdom Hereford Cathedral School, in England Hull Collegiate School, in England
United States Hackensack Christian School, in New Jersey Hampshire Country School, in New Hampshire Hampton Christian Schools, in Virginia Hardin County Schools, in Kentucky Harrisburg Christian School, in Pennsylvania Hawkins County Schools in Tennessee Highland Catholic School, in Minnesota Hilltop Christian School, in North Carolina Hinsdale Central School, in New York Holland Christian Schools, in Michigan Horry County Schools, in South Carolina
Biology and medicine Hajdu–Cheney syndrome High-content screening Human chorionic somatomammotropin Hydrocortisone
Science and mathematics HCS clustering algorithm Heliospheric current sheet Hierarchical constraint satisfaction Hummocky cross-stratification
Technology Hard-clad silica optical fiber Header check sequence Hierarchical cell structure (telecommunications) Hub-center steering
Other uses Halifax Choral Society Halo Championship Series Harlem Children Society Henry Christian Spencer High Council of State (disambiguation) The Histochemical Society Hollywood Center Studios Honoris Crux Silver, a military decoration of South Africa Honourable Company's Service or Honourable Company's Ship, used to prefix the names of East India Company ships HUMINT Control System, an aspect of the Sensitive compartmented information protocol Hyderabad Civil Service, India Healthcare scientist Hull classification symbol