HCS

; 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

• Hajdu–Cheney syndrome
• High-content screening
• Human chorionic somatomammotropin
• Hydrocortisone

• HCS clustering algorithm
• Heliospheric current sheet
• Hierarchical constraint satisfaction
• Hummocky cross-stratification

• Hard-clad silica optical fiber
• Header check sequence
• Hierarchical cell structure (telecommunications)
• Hub-center steering

• 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

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