| Acronym | Definition |
|---|
| USG | University System of Georgia |
| USG | Undergraduate Student Government |
| USG | United States Government |
| USG | United States Gypsum |
| USG | Unified Security Gateway (computing) |
| USG | Under Secretary General |
| USG | Ultrasonography |
| USG | Universal Security Group |
| USG | User Support Group |
| USG | Unhealthy for Sensitive Groups (air quality index) |
| USG | Ulysses S. Grant (president and general) |
| USG | Urine Specific Gravity |
| USG | Unix Support Group |
| USG | Utrecht School of Governance (Netherlands) |
| USG | UNIX Security Guards (hacker group) |
| USG | United States Gulf (of Mexico) |
| USG | Undoped Silicate Glass |
| USG | United States Gallon |
| USG | Universal Security Group (Microsoft) |
| USG | Unix Security Guard (pro-Islamic hacking group) |
| USG | Urea Supergranule |
| USG | Urban Social Geography |
| USG | Unión Solidarista Guatemalteca (Guatemalan Solidarity Union) |
| USG | United States Gauge (Sprint) |
| USG | Universities of Shady Grove (Maryland) |
| USG | l'Union Socialiste de Gabonaise (Gabonese Socialist Union; political party) |
| USG | Utilities Solutions Group |
| USG | Undoped Silica Glass |