| Acronym | Definition |
|---|
| GMT➣Greenwich Mean Time |
| GMT➣Giant Magellan Telescope |
| GMT➣Generic Mapping Tools (software) |
| GMT➣Global Mean Temperature |
| GMT➣Global Mixed-Mode Technology (est. 1996; Taiwan) |
| GMT➣Generic Mapping Tools |
| GMT➣General Motors Trucks |
| GMT➣Gigabyte Management Tools |
| GMT➣Geometric Mean Titer (vaccination) |
| GMT➣Greenwich Meridian Time |
| GMT➣Geometric Mean Titers |
| GMT➣Guy, McCoy, Torme (band) |
| GMT➣General Military Training |
| GMT➣Glass Mat Thermoplastic |
| GMT➣Governor Macquarie Tower (Sydney, Australia) |
| GMT➣Gunner's Mate (Technician, USN Rating) |
| GMT➣Global Management Technologies |
| GMT➣Good Management Practice |
| GMT➣Ground Moving Target |
| GMT➣Get Me Tickets |
| GMT➣Gear Media Tech (Pixel Corps) |
| GMT➣General Motors Tandem (diesel) |
| GMT➣Ground Multiband Terminal |
| GMT➣Groupe Multidisciplinaire Sur l'action Internationale Contre Le Terrorisme (French: Multidisciplinary Group on International Action against Terrorism, EC) |
| GMT➣Global Media Transfer (Harris Automation) |
| GMT➣Gannett, McClatchy and Tribune (ad network) |
| GMT➣George Massey Tunnel (British Columbia, Canada) |
| GMT➣Glasgow Museum of Transport (Scotland) |
| GMT➣Green Metric Ton |
| GMT➣Generalized Multi-Pole Technique |
| GMT➣Guided Missile Transport |
| GMT➣General Map Table |
| GMT➣Glen Moore Transportation, Inc. |
| GMT➣GACT Multiterminal |
| GMT➣Guided Missile Target |
GMT - the local time at the 0 meridian passing through Greenwich, England; it is the same everywhere