| Acronym | Definition |
|---|
| HEMS | Home Energy Management System (various companies) |
| HEMS | Helicopter Emergency Medical Service (London Ambulance Service) |
| HEMS | High-Level Entity Management System (internetwork management protocol) |
| HEMS | Harsh Environment Mass Spectrometry (workshop; est. 1999; Florida) |
| HEMS | Health Education Monitoring Survey (UK) |
| HEMS | Harvard Early Music Society (student organization; Harvard University; Cambridge, MA) |
| HEMS | Harvard Emergency Medical Services (Harvard College; Cambridge, MA) |
| HEMS | High Energy Magnet Spectrometer |