| Abbreviation | Definition |
|---|---|
| HLCO | Helicopter Coordinator |
| HLPS | Heavy-Lift Pre-Position Ship |
| HLR | High Lift Rotor |
| HLU | High-Level Unit |
| HLZ | Helicopter Landing Zone |
| HM | Hazardous Material |
| HM | Helmineron Military |
| HM | Her Majesty's |
| HM58 | Swiss Falcon |
| HMA | Helicopter Maritime Attack |
| HMA | Humanitarian Mine Action |
| HMAS | Her Majesty's Australian Ship |
| HMAS | Her Military Australian Ship |
| HMAS | His Majesty's Australian Ship |
| HMAV | Her Majesty's Army Vessel |
| HMB | Hardware Management Board |
| HMC | High Mobility Camouflage |
| HMC | His Majesty's Cutter |
| HMCM | Hazardous Material Control and Management |
| HMCS | Her Majesty's Canadian Ship |