HSR
- HSR Layout
- Haliburton Scout Reserve
- Hamilton Street Railway
- Hart–Scott–Rodino Antitrust Improvements Act
- Health services research
- Heat shock response
- Hidden surface removal
- Hierarchical state routing
- High-Speed Research Program
- High-availability Seamless Redundancy
- High-speed rail
- Higher-speed rail
- Hisar Junction railway station
- Historic Sportscar Racing
- Historical Social Research
- Hochschule für Technik Rapperswil
- Holyoke Street Railway
- Homogeneously staining region
- Hot Springs Municipal Airport
- Mitsubishi HSR