HEC
- Art Garvey
- HDMI Ethernet Channel
- HEC syndrome
- Habitable Exoplanets Catalog
- Hautes Études Commerciales (disambiguation)
- Header Error Control
- Heart of Europe Bio-Crystallography Meeting
- Hec Clouthier
- Hec Crighton
- Hec Cyre
- Hec Davidson
- Hec Edmundson
- Hec Fowler
- Hec Gervais
- Hec Highton
- Hec Kilrea
- Hec Lalande
- Hec McKay
- Hec Oakley
- Hec Ramsey
- Hec Yeomans
- Heckington railway station
- Hector Dyer
- Hector Hogan
- Hector Lépine
- Hector Pothier
- Hector Waller
- Higher Education Commission (disambiguation)
- Hollerith Electronic Computer
- Hongkong Electric Company
- Hotel Ezra Cornell
- Human equivalent concentration
- Hydro Tasmania
- Hydroxyethyl cellulose
- Hyperelliptic curve
- Hyperinsulinemic euglycemic clamp
- Hyundai Engineering (HEC)