| Acronym | Meaning |
 | GYRO | Gyroscope |
| GYROA | Gyro A |
| GYROCOMP | Gyrocompassing |
| H | AlH AlAltitude Rate |
| H | AlH AlHazardous (Task Classification) |
| H | AlH AlHead |
| H | AlH AlHenry (Si Unit) |
| H | AlH AlHigh |
| H | AlH AlHorizontal |
| H | AlH AlHot |
| H | AlH AlHours |
| H | AlH AlMomentum |
| H | AlH Altitude |
| H | 2Hydrogen |
| H | 20Water |
| H | MHinge Mount |
| H | /'EHeat Exchanger |
| H | 1STHistory |
| H | EPAHigh Efficiency Particle Accumulator |
| H | EPAHigh Efficiency Particle Air (Filter) |
| H | LTLHigh Level Test Language |
| H-CITE | Horizontal-Cargo Integration Test Equipment |
| H/L | Hardline |
| H/O | Handover |
| H/S | Heat Shield |
| H/S | IR Hardware/Software Integration Review |
| H/T | Heat Treat |
| H/W | Hardware |
| H2 | Hydrogen |
| HA | Apogee Altitude |
| HA | Hazard Analysis |
| HA | High Altitude |
| HAA | High Altitude Abort |
| HAB | Habitation |
| HAC | Heading Alignment Circle |
| HAC | Heading Alignment Cone |
| HAC | Heading Alignment Cylinder |
| HAC | Heading Alignment Cylinder |
| HAD | Heat Actuated Device |
| HAFB | Holloman Air Force Base |
| HAINS | High-accuracy Inertial Navigation System |
| HAK | Horizontal Access Kit |
| HAL | High Order Articulated Language |
| HAL | High Order Assembly Language |
| HAL | Houston Aerospace Language |
| HAL/S | Computer |
| HAL/S | High Order Assembly Language For Shuttle Flight |
| HAL/S | High Order Assembly Language/Shuttle |
| HAL/S | High Order Programming Language For Spacelab Usage |
| HAL/S | High-order Assembly Language/ Shuttle |
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