| Acronym | Definition |
|---|
| UG | Undergraduate |
| UG | User Group |
| UG | Underground |
| UG | Ultimate-Guitar (Guitar tablatures website) |
| UG | Ultimate-Guitar.com |
| UG | Upgraded |
| UG | University of Ghana |
| UG | Unternehmergesellschaft (German: Entrepreneurial Company) |
| UG | Uganda |
| UG | User's Guide |
| UG | Unigraphics (Finite Element Analysis Software by Unigraphics Solutions). |
| UG | Untergeschoss (German: basement) |
| UG | University of Georgia |
| UG | Upper Gastrointestinal |
| UG | University of Guyana |
| UG | Use Google |
| UG | Ungraded |
| UG | Universal Grammar |
| UG | Urogenital |
| UG | Microgram (µg is more correct) |
| UG | Undergrowth |
| UG | Uncle Grandpa |
| UG | United-Guardian Inc (pharmaceutical manufacturer) |
| UG | United Group (aka UGOC: United Group of Companies) |
| UG | Urban Grower (online video series) |
| UG | Uighur (ISO language code, aka: UIG) |
| UG | Uniglide (Shimano Chain and Cogs) |
| UG | Universal Gravitational constant |
| UG | Ugly Girl |
| UG | Universal Gateway (computer protocol) |
| UG | Universiteit Gent (Dutch: Ghent University; Ghent, Belgium) |
| UG | Unfilled Grain |
| UG | United States to Mediterranean (routing designation; US Navy) |
| UG | U Grade (paper) |
| UG | Unmanned Gear (Metal Gear video game series) |
| UG | Unreal Gold (game) |
| UG | Underpass Gang (Unofficial New Orleans Saints Fan Club) |
| UG | Utricularia Graminifolia (carnivorous plant) |
| UG | Unemotional Growth |
| UG | Union Gramme (French; Belgian engineering group) |
| UG | Upper Garage |
| UG | Untouchable Gangsters (gaming clan) |
| UG | Geometrical Unsharpness |
| UG | Undefined Gaming |