| Acronym | Meaning |
 | GSM | General Service Medal - Grams Per Square Metre (paper Thickness; Properly G/m?) - Ground Station Module - Groupe Sp?cial Mobile (French |
| GSO | General Services Officer (U.S. Department Of State) |
| GSOH | Good Sense Of Humour |
| GSR | Gun Shot Revenue |
| GSS | Generic Security Services |
| GST | Goods And Services Tax (Australia |
| GT | Gigatesla -Gran Turismo - Grand Touring -Guatemala (FIPS 10-4 Country Code; ISO 3166 Digram) |
| GTA | Grand Theft Auto |
| GTD | Getting Things Done |
| GTG | Got To Go (Internet Chat) |
| GTGN | Getty Thesaurus Of Geographic Names |
| GTM | Guatemala (ISO 3166 Trigram) |
| GTQ | Guatemalan Quetzal (ISO 4217 Currency Code) |
| GU | Guam (postal Symbol; ISO 3166 Digram) |
| GU | Gujarati Language (ISO 639-1 Code) |
| GUF | French Guiana (ISO 3166 Trigram) |
| GUI | Graphical User Interface (goo-ey) |
| GUILT | Gangliated Utrophin Immuno Latency Toxin |
| GUJ | Gujarati Language (ISO 639-2 Code) |
| GULAG | Glavnoye Upravleniye Ispravitelno-trudovykh LAGerei I Kolonii (Russian ??????? ?????????? ????????????? ???????? ??????? ? ??????? |
| GULCR | Grupo De Usuarios De Linux De Costa Rica |
| GUM | Guam (ISO 3166 Trigram) |
| GUT | Grand Unification Theory |
| GUY | Guyana (ISO 3166 Trigram) |
| GV | Gigavolt - Guinea (FIPS 10-4 Country Code) |
| GV | Manx Language (ISO 639-1 Code) |
| GW | Games Workshop - Germ Warfare -Gigawatt -Guided Weapon -Guinea-Bissau (ISO 3166 Digram) |
| GWARS | Ground Warfare System (simulation) |
| GWAS | Grand Western Archery Society |
| GWS | Gulf War Syndrome |
| GY | Guyana (FIPS 10-4 Country Code; ISO 3166 Digram) |
| GYD | Guyana Dollar (ISO 4217 Currency Code) |
| GYY | Gary/Chicago International Airport (IATA Airport Code) |
| GZ | Gaza Strip (FIPS 10-4 Territory Code) -Ground Zero |
| GZK | Greisen-Zatsepin-Kuzmin Cut-off (cosmic Ray Energies) |
| H | Hecto |
| H | Henry - Hydrogen |
| H.C. | Honoris Causa (Latin |
| H/MAD | High/Medium Altitude Air Defence (aytchmad; See Also HIMAD) |
| HA | Haiti (FIPS 10-4 Country Code) -High Availability |
| HA | Hausa Language (ISO 639-1 Code) - Hectare |
| HAART | Highly Active Anti-Retroviral Therapy |
| HAI | Human Awareness Institute |
| HAL | Hardware Abstraction Layer |
| HALO | High Altitude Low Opening (parachute Jump) |
| HALT | Hungry Angry Lonely Tired |
| HANS | Head And Neck Support (device Used In Many Race Cars) |
| HARM | High-speed Anti-Radiation Missile |
| HAT | Highest Astronomical Tide (nautical Charts) -Hungarian Automated Telescope |
| HAT | Haitian Creole Language (ISO 639-2 Code) |
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