| Abbreviation | Definition |
|---|---|
| HLA | Heavy Load Assessment |
| HLA | Horizontal Line Array |
| HLA | Hyperbaric Lighting Assembly |
| HLAL | High Level Assembler Language |
| HLD | Hold |
| HLDS | Hydrogen Leak Detection System |
| HLLV | Heavy Lift Launch Vehicle |
| HLMT | Helmet |
| HLTL | High Level Test Language |
| HLTL | High-Level Test Language |
| HM | Hinge Mount |
| HMA | Hypergot Maintenance Area |
| HMC | Hybrid MicroCircuit |
| HMC | Hypergolic Maintenance and Checkout |
| HMCC | Houston Mission Control Center |
| HMCC | Hypergolic Maintenance and Checkout Cell |
| HMCF | Hypergolic Maintenance and Checkout Facility |
| HMF | Horizontal Mating Facility |
| HMF | Hypergol Maintenance Facility |
| HMP | Hydrozene MonoPropeflant |