| Acronym | Meaning |
 | HAU | Hausa Language (ISO 639-2 Code) |
| HAW | Heavy Antitank Weapon |
| HAWK | Homing All The Way Killer (air Defence System) |
| HAZ | Heat-Affected Zone |
| HAZMAT | Hazardous Materials |
| HBCD | HexaBromoCycloDodecane |
| HBO | Home Box Office |
| HBR | Human Behaviour Representation |
| HBT | Heterojunction Bipolar Transistor |
| HBV | Hepatitis B Virus |
| HCCI | Homogeneous Charge Compression Ignition |
| HCF | Highest Common Factor |
| HCI | Human-Computer Interaction/Interface |
| HCSC | Higher Command And Staff Course |
| HCT | Higher Colleges Of Technology |
| HD | Henry Draper (star Catalogue) - Hull-Down (armoured Vehicle Target |
| HDD | Hard Disk Drive - High-Density Disk |
| HDL | High-Density Lipoprotein |
| HDM | Human Decision-Making |
| HDRA | Henry Doubleday Research Association |
| HDTV | High-Definition Television |
| HE | High Explosive |
| HE | Hebrew Language (ISO 639-1 Code) |
| HE | Helium |
| HEAT | High Explosive Anti-Tank (ammunition) |
| HEB | Hebrew Language (ISO 639-2 Code) |
| HEER | High-Explosive Extended Range (ammunition) |
| HEIC | Honourable East India Company |
| HEMP | High-Altitude Electromagnetic Pulse |
| HEO | Highly Elliptical Orbit |
| HEOSS | High Earth Orbit Space Surveillance |
| HEP | High-Explosive Plastic (ammunition) |
| HEPA | High-Efficiency Particulate Air (filter) |
| HER | Herero Language (ISO 639-2 Code) |
| HESH | High-Explosive |
| HESV | Heavy Engineering Support Vehicle |
| HETT | Heavy Equipment Transporting Truck / Heavy Equipment Truck Tractor |
| HEU | Highly Enriched Uranium |
| HF | High Frequency |
| HF | Hafnium |
| HFAC | Human Factors (aytchfak) |
| HFE | Human Fertilisation And Embryology (UK Act) |
| HFEA | Human Fertilisation And Embryology Authority (UK) |
| HG | Mercury (Latin Hydrargyrum) |
| HGC | UK Human Genetics Commission |
| HGF | Human Growth Factor |
| HHD | Humanitatum Doctor (Latin |
| HI | Hawaii (postal Symbol) |
| HI | Hindi Language (ISO 639-1 Code) |
| HIDACZ | High-Density Airspace Control Zone (high Dak Zed/zee) |
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