HMSO
| Acronym | Definition |
|---|---|
| HMSO | Her/His Majesty's Stationery Office |
| HMSO | Hazardous Materials Storage Ordinance |
| HMSO | Hawaii Military Surfing Organization (formerly Hawaii Military Surfing Ohana) |
| HMSO | Highline Medical Services Organization (Burien, WA) |
| HMSO | Hammarskjold Middle School Orchestra (New Jersey) |