| Abbreviation | Definition |
|---|---|
| H/T | Heat Treat |
| H/W | Hardware |
| H2 | Hydrogen |
| H2O | Water |
| H2O2 | Hydrogen Peroxide |
| HA | Hazard Analysis |
| HA | Height at Apogee (Apogee Altitude) |
| HAA | High Altitude Abort |
| HAA | High Altitude Airship |
| HAARP | High Altitude Auroral Research Program |
| HAB | HABitation |
| HABT | HABitability Technology |
| HAC | Heading Alignment Cone |
| HAC | High Accuracy Clock |
| HACBSS | Homestead And Community Broadcasting Satellite Service |
| HACCP | Hazard Analysis and Critical Control Point |
| HAD | Heat-Actuated Device |
| HAFB | Holloman Air Force Base |
| HAINS | High-Accuracy Inertial Navigation System |
| HAK | Horizontal Access Kit |