| Abbreviation | Definition |
|---|---|
| USTDA | United States Trade and Development Agency |
| USTP | United States Trustee Program |
| USTR | United States Trade Representative |
| USVAO | United States Veterans Assistance Office |
| USWB | United States Weather Bureau |
| UTR | Unique Tax Reference |
| UTRFWG | Upper Truckee River Focused Watershed Group |
| UTT | Under The Table |
| UVD | U. S. Vital Documents |
| UVD | Unionist Veto Disease |
| UVI | UltraViolet Index |
| UVIF | UltraViolet Index Forecast |
| UVX | Universal Value eXchange |
| UW | Unconventional War |
| UWC | Unemployment and Workers' Compensation |
| UWH | Universal Waste Handler |
| UWQ | Universal Waste rule Questions |
| UWR | Universal Waste Rule |
| UWR | Upland/ Wetland/ Reuse |
| UXT | Utility Excise Tax |