| Acronym | Meaning |
 | HHMU | Hand Held Maneuvering Unit |
| HI | Honeywell |
| HI | High |
| HIC | Hickam Air Force Base |
| HID | Hardware Interface Device |
| HID | HIM Interface Distributor |
| HIGH | PressuHigh Pressure |
| HIGH | RatioMultiplier |
| HIM | Hardware Interface Module |
| HIP | Hardware Interface Program |
| HIP | Hardware Interface Program |
| HIPC | High Chamber Pressure |
| HIPO | Hierarchical Input/Process Output |
| HIPO | Hierarchy Plus InPut/Process/Output |
| HIRAP | High-resolution Accelerometer Package |
| HISAM | Hardware Initiated Standalone Memory |
| HITS | High Rate Multiplexer InPut/Output Test System |
| HIU | Headset Interface Unit |
| HIU | Headset Interface Unit |
| HIV | Helium Isolation Valve |
| HK | Housekeeping |
| HL | Hardline |
| HL | Heel Line |
| HL | High Level |
| HL | Hinge Line |
| HL | Hydrogen Line |
| HLAL | High Level Assembler Language |
| HLD | Hold |
| HLDS | Hydrogen Leak Detection System |
| HLMT | Hel Met |
| HMA | Hypergot Maintenance Area |
| HMC | Hybrid Microcircuit |
| HMC | Hypergolic Maintenance And Checkout |
| HMCC | Hypergolic Maintenance And Checkout Cell |
| HMCF | Hypergolic Maintenance And Checkout Facility |
| HMCF | Hypergolic Maintenance And Checkout Facility |
| HMD | Helmet-Mounted Display |
| HMF | Horizontal Mating Facility |
| HMF | Hypergot Maintenance Facility |
| HMP | Hydrozene Monopropeflant (RCS Propellant) |
| HMS | History Memory System |
| HMU | Hardware Mockup |
| HMV | Hydrogen Manual Valve |
| HNDLER | Handler |
| HNGR | Hangar |
| HO | Hydrogen-OxYgen |
| HOL | High Order Language |
| HOLC | High Order Language Computer |
| HORIZ | Horizon |
| HOS | High Order Software |
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