| Acronym | Meaning |
 | HIH | His (or Her) Imperial Highness |
| HIM | His (or Her) Imperial Majesty |
| HIMAD | High To Medium Altitude Air Defence (see Also H/MAD) |
| HIMEZ | High Altitude Missile Engagement Zone |
| HIN | Hindi Language (ISO 639-2 Code) |
| HIPAA | U.S. Health Insurance Portability And Accountability Act |
| HIPPARCOS | HIgh Precision Parallax COllecting Satellite |
| HIRD | Hurd Of Interfaces Representing Depth (cf. HURD) |
| HIRISE | High Resolution Imaging Science Experiment |
| HIT | Head Injection Technology |
| HIV | Human Immunodeficiency Virus |
| HIWT | Hobart Institute Of Welding Technology |
| HJ | Hic Jacet (Latin |
| HJD | Heliocentric Julian Day |
| HK | Hong Kong (ISO 3166 Digram; FIPS 10-4 Territory Code) |
| HKD | Hong Kong Dollar (ISO 4217 Currency Code) |
| HKG | Hong Kong (ISO 3166 Trigram) |
| HKS | HyperKinetic Syndrome |
| HL | Holding Line |
| HL | Hectolitre |
| HLA | High Level Architecture - Human Leukocyte Antigen |
| HLL | High-Level Language |
| HLS | Hoc Loco Situs (Latin |
| HLVW | Heavy Logistics Vehicle |
| HM | Heard Island And McDonald Islands (ISO 3166 Digram; FIPS 10-4 Territory Code) |
| HMCE | Her Majesty's Customs And Excise |
| HMCS | Her Majesty's Canadian Ship Or Her Majesty's Courts Service |
| HMD | Heard And McDonald Islands (ISO 3166 Trigram) |
| HMF | HydroxyMethyl Furfural |
| HMM | Hidden Markov Model |
| HMMWV | High Mobility Multipurpose Wheeled Vehicle (hum-vee; Hummer) |
| HMO | Health Management Organization |
| HMO | Hiri Motu Language (ISO 639-2 Code) |
| HMP | Her Majesty's Prison |
| HMS | Helmet-mounted Display - Her Majesty's Ship (Royal Navy) |
| HMSO | Her Majesty's Stationery Office |
| HMV | His Master's Voice |
| HN | Honduras (ISO 3166 Digram) |
| HND | Honduras (ISO 3166 Trigram) |
| HNL | Honduran Lempira (ISO 4217 Currency Code) |
| HO | Hiri Motu Language (ISO 639-1 Code) |
| HO | Holmium |
| HO | Honduras (FIPS 10-4 Country Code) |
| HOLLAND | Hope Our Love Lasts And Never Dies |
| HOPI | Hybrid Optical And Packet Infrastructure (see Internet2 |
| HORECA | Hotel |
| HORIZON | H?licopt?re D'observation Radar Et D'investigation Sur Zone (French |
| HOSTAC | Helicopter Operations From Ships Other Than Aircraft Carriers |
| HOT | Highly Optimised Tolerance |
| HOTAS | Hands On Throttle-and-stick |
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