| Acronym | Meaning |
| TFI | Office Of Terrorism And Financial Intelligence |
| TIC | Trade Information Center |
| TRI | Toxics Release Inventory |
| TSA | Transportation Security Administration |
| TSI | Transportation Safety Institute |
| TSO | TRICARE Support Office |
| TSP | Thrift Savings Plan |
| TVA | Tennessee Valley Authority |
| U.N. | United Nations |
| U.S.C. | United States Code |
| UNESCO | United Nations Educational |
| UNICEF | United Nations Children's Fund |
| UNICOR | Federal Prison Industries |
| UPU | Universal Postal Union |
| USA | United States Army |
| USACE | U.S. Army Corps Of Engineers |
| USAF | United States Air Force |
| USAFA | United States Air Force Academy |
| USAID | United States Agency For International Development |
| USBR | Bureau Of Reclamation |
| USCCR | United States Commission On Civil Rights |
| USCG | United States Coast Guard |
| USCIRF | United States Commission On International Religious Freedom |
| USCIS | U.S. Citizenship And Immigration Services |
| USCS | United States Customs Service |
| USDA | United States Department Of Agriculture |
| USES | United States Employment Service |
| USFA | U.S. Fire Administration |
| USGS | United States Geological Survey |
| USIA | United States Information Agency (changed To IIP) |
| USIP | United States Institute Of Peace |
| USITC | United States International Trade Commission |
| USMC | United States Marine Corps |
| USMS | United States Marshals Service |
| USN | United States Navy |
| USNCB | United States National Central Bureau Of INTERPOL |
| USPS | United States Postal Service ˜(state And Street Abbreviations) |
| USPTO | United States Patent And Trademark Office |
| USSC | United States Sentencing Commission |
| USSS | United States Secret Service |
| USTR | United States Trade Representative |
| VA | Department Of Veterans Affairs |
| VAWO | Violence Against Women Office |
| VBA | Veterans Benefits Administration |
| VETS | Veterans' Employment And Training Service |
| VGLI | Veterans' Group Life Insurance |
| VHA | Veterans Health Administration |
| VISTA | Volunteers In Service To America |
| VOA | Voice Of America |
| WAPA | Western Area Power Administration |