| H | AlH AlAltitude Rate | - | Organizations |
| H | AlH AlHazardous (Task Classification) | - | Organizations |
| H | AlH AlHead | - | Organizations |
| H | AlH AlHenry (Si Unit) | - | Organizations |
| H | AlH AlHigh | - | Organizations |
| H | AlH AlHorizontal | - | Organizations |
| H | AlH AlHot | - | Organizations |
| H | AlH AlHours | - | Organizations |
| H | AlH AlMomentum | - | Organizations |
| H | AlH Altitude | - | Organizations |
| H | 2Hydrogen | - | Organizations |
| H | 20Water | - | Organizations |
| H | MHinge Mount | - | Organizations |
| H | /'EHeat Exchanger | - | Organizations |
| H | 1STHistory | - | Organizations |
| H | EPAHigh Efficiency Particle Accumulator | - | Organizations |
| H | EPAHigh Efficiency Particle Air (Filter) | - | Organizations |
| H | LTLHigh Level Test Language | - | Organizations |
| H-CITE | Horizontal-Cargo Integration Test Equipment | - | Organizations |
| H/L | Hardline | - | Organizations |
| H/O | Handover | - | Organizations |
| H/S | Heat Shield | - | Organizations |
| H/S | IR Hardware/Software Integration Review | - | Organizations |
| H/T | Heat Treat | - | Organizations |
| H/W | Hardware | - | Organizations |
| H2 | Hydrogen | - | Organizations |
| HA | Apogee Altitude | - | Organizations |
| HA | Hazard Analysis | - | Organizations |
| HA | High Altitude | - | Organizations |
| HAA | High Altitude Abort | - | Organizations |
| HAB | Habitation | - | Organizations |
| HAC | Heading Alignment Circle | - | Organizations |
| HAC | Heading Alignment Cone | - | Organizations |
| HAC | Heading Alignment Cylinder | - | Organizations |
| HAC | Heading Alignment Cylinder | - | Organizations |
| HAD | Heat Actuated Device | - | Organizations |
| HAFB | Holloman Air Force Base | - | Organizations |
| HAINS | High-accuracy Inertial Navigation System | - | Organizations |
| HAK | Horizontal Access Kit | - | Organizations |
| HAL | High Order Articulated Language | - | Organizations |
| HAL | High Order Assembly Language | - | Organizations |
| HAL | Houston Aerospace Language | - | Organizations |
| HAL/S | Computer | - | Organizations |
| HAL/S | High Order Assembly Language For Shuttle Flight | - | Organizations |
| HAL/S | High Order Assembly Language/Shuttle | - | Organizations |
| HAL/S | High Order Programming Language For Spacelab Usage | - | Organizations |
| HAL/S | High-order Assembly Language/ Shuttle | - | Organizations |
| HAM | Height Adjustment Maneuver | - | Organizations |
| HAP | Hardware Allocation Panel | - | Organizations |
| HAS | Holddown Alignment Support | - | Organizations |
| HAS | Hydraulic Actuation System | - | Organizations |
| HAS | Hydrogen Actuation System | - | Organizations |
| HAST | High Altitude Supersonic Target | - | Organizations |
| HAW | Hawaii (STDN) | - | Organizations |
| HB | Handbook | - | Organizations |
| HB | High Bay | - | Organizations |
| HBR | High Bit Rate | - | Organizations |
| HBT | Heflex Bio-Engineering Test | - | Organizations |
| HBW | Hot Bridge Wire | - | Organizations |
| HC | Hand Controller | - | Organizations |
| HC | Head Count | - | Organizations |
| HC | Hybrid Computer | - | Organizations |
| HCED | Hand Controller Engage Driver | - | Organizations |
| HCF | High Cycle Fatigue | - | Organizations |
| HCF | HIM Configuration File | - | Organizations |
| HCL | Horizontal Centerline | - | Organizations |
| HCM | Hard Copy Module | - | Organizations |
| HCMM | Heat Capacity Mapping Mission | - | Organizations |
| HCR | High Cross Range | - | Organizations |
| HCSI | Hughes Communications Services | - | Organizations |
| HCSL | Hybrid Computation And Simulation Laboratory | - | Organizations |
| HCU | Hydraulic Charging Unit | - | Organizations |
| HCV | Hydrogen Check Valve | - | Organizations |
| HD | Heavy Duty | - | Organizations |
| HD | Highly Desirable | - | Organizations |
| HD | Hoiddown | - | Organizations |
| HD | Horizontal Drain | - | Organizations |
| HD | Hydrogen Drain | - | Organizations |
| HDA | Housekeeping Data Acquisition | - | Organizations |
| HDC | Hasselblad Data Camera | - | Organizations |
| HDC | HYbrid Device Controller | - | Organizations |
| HDDR | High-Density Digital Recorder | - | Organizations |
| HDG | Heading | - | Organizations |
| HDP | Holddown Post | - | Organizations |
| HDQ | Headquarters | - | Organizations |
| HDR | High Data Rate | - | Organizations |
| HDR | High Data Rate | - | Organizations |
| HDRA | High Data Rate Assembly | - | Organizations |
| HDRM | High Data Rate Multiplexer | - | Organizations |
| HDRR | High Data Rate Recorder | - | Organizations |
| HDRR | High-data-rate Recorder | - | Organizations |
| HDRSS | High Data Rate Storage System | - | Organizations |
| HDS | Hardware DescriPtion Sheet | - | Organizations |
| HDST | Headset | - | Organizations |
| HDW | Hardware | - | Organizations |
| HDWE | Hardware | - | Organizations |
| HE | Heat Exchange (Exchanger) | - | Organizations |
| HE | Helium | - | Organizations |
| HE | High Energy Astrophysics | - | Organizations |
| HEAO | High Energy Astronomy Observatory | - | Organizations |
