HMS
- HMS Group
- HMS Networks
- HSM (disambiguation)
- Habib Medical School
- Hartford Medical Society
- Hartley–Melvin–Sanborn Community School District
- Harvard Medical School
- Health management system
- Heavy melting steel
- Heidelberg Middle School
- Hellenic Mathematical Society
- Helmet mounted sight
- Helmsdale railway station
- Helsinki Motor Show
- Hendrick Motorsports
- Highly migratory species
- Hind Mazdoor Sabha
- His Majesty's Ship
- Historical Maritime Society
- Hongwanji Mission School
- Horley Methodist School, Teluk Intan
- Huawei Mobile Services
- Hybrid Management Sub-Layer
- Hypermobility spectrum disorder
- Joint Tactical Radio System
- Munter hitch