| Acronym | Meaning |
 | HP | Horse Power |
| HPCC | High Performance Computers & Communication |
| HPDU | Hydraulic Power Drive Unit |
| HPM | High Power Microwave |
| HRMSS | Human Resources Management Support System |
| HSD | Horizontal Situation Display |
| HSI | Hardware/software Integration |
| HSI | Horizontal Situation Indicator |
| HST | Hoist |
| HTCL | Remote Hover Trim Controller |
| HTRS | Heaters |
| HUD | Head Up Display |
| HVR | Hover |
| HWCI | Hardware Configuration Item |
| HYD | Hydraulic |
| HYDR | Hydraulic |
| HYTOW | (an/wqc-5) |
| HZ | Hertz |
| I | Intermediate |
| I&T | Integration & Test |
| I/ETM | Interactive/electronic Technical Manuals |
| I/I | Inboard/inboard |
| I/ITSC | Interservice/industry Training Systems Conference |
| I/O | Inboard/outboard |
| I/O | Input/ouput |
| IACS | Integrated Acoustic Communication System |
| IAS | Indicated Airspeed |
| IAW | In Accordance With |
| IBC | Ils Back Course |
| IBIT | Initiated Built-in Test |
| IBM | International Business Machine Company |
| IC | Indenture Code Instruction Counter |
| IC | Integrated Circuit |
| ICADS | Integrated Cover And Deception System |
| ICAO | International Civil Aviation Organization |
| ICAP | Increased Capacity |
| ICAPS | Integrated Command Anti-submarine Warfare Diction System |
| ICASMA | Defense Contracts Administration Systems Agency |
| ICC | Instructor Control Console |
| ICC | Life Cycle Costing |
| ICD | Interface Control Document |
| ICS | Intercom System |
| ICS | Intercommunication Control System |
| ICS | Interim Contractor Suppor |
| ICW | Interactive Courseware |
| ID | Identification |
| ID | Interface Device |
| ID | Interface Diagram |
| ID | Interface Diagnostics |
| IDA | Institute For Defense Analysis |
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