| unifamiliar | jednorodzinny |
| unificación | zjednoczenie |
| Unificación alemana | Zjednoczenie Niemiec |
| Unificación de Italia | Zjednoczenie Włoch |
| Unificación o Muerte | Czarna Ręka |
| Unified threat management | Unified Threat Management |
| Uniform Resource Identifier | Uniform Resource Identifier |
| uniforme | jednolity |
| Uniforme escolar | Mundurek szkolny |
| uniformemente | równo |
| Uniformismo | Aktualizm |
| unilateral | jednostronny |
| Unilever | Unilever |
| Union Europea | Unia Europejska |
| Union Internationale des Chemins de Fer | UIC |
| Union Sportive Créteil-Lusitanos | US Créteil |
| Union Station | Union Station |
| Unione Calcio Sampdoria | Sampdoria Genua |
| Unione Sportiva Città di Palermo | US Palermo |
| Unione Sportiva Lecce | US Lecce |
| Unione Sportiva Triestina Calcio | Triestina Calcio |
| unir | jednoczyć |
| unir, soldar | spajać |
| Uniramia | Tchawkowce |
| unirse | łączyć |
| Unis | Unis |
| Unisón | Unisono |
| unitarianismo | unitarianizm |
| unitarismo | unitarianizm |
| United Airlines | United Airlines |
| United Center | United Center |
| United Fruit Company | United Fruit Company |
| United Parcel Service | United Parcel Service |
| United States Geological Survey | United States Geological Survey |
| United World Chart | United World Chart |
| UNIVAC | UNIVAC |
| universal | uniwersalny |
| Universal Carrier | Universal Carrier |
| Universal Disk Format | UDF |
| Universal Media Disc | Universal Media Disc |
| Universal Mobile Telecommunications System | Universal Mobile Telecommunications System |
| Universal Music Group | Universal Music Group |
