HSS
- Croatian Chess Federation
- Croatian Peasant Party
- ERA HSS
- England
- HSS Hire
- HSS Journal
- Hampstead Scientific Society
- Harsusi language
- Health systems strengthening
- Helsingfors Segelsällskap
- Henderson Secondary School
- High Storrs School
- High-speed Sea Service
- High-speed steel
- Hindu Swayamsevak Sangh
- Hisar Airport
- History of Science Society
- Hollow structural section
- Holy Spirit School (disambiguation)
- Home Subscriber Server
- Hospital for Special Surgery
- Humanist Society Scotland
- Humbergrove Secondary School
- Hungarian Skeptic Society
- New York City
- Sheffield
- Singapore
- Toronto