| Uniata | Eastern Rite |
| Unica Zürn | Unica Zürn |
| UNICEF | UNICEF |
| uniceja | unibrow |
| unicel | styrofoam |
| unicelular | unicellular |
| unicidad | uniqueness |
| unico | only |
| Unico Wilhem van Wassenaer | Unico Wilhelm van Wassenaer |
| Unicode | Unicode |
| unicornio | unicorn |
| Unicornio rosa invisible | Invisible Pink Unicorn |
| unidad | union |
| Unidad aritmética | ALU |
| Unidad aritmética y lógica | ALU |
| unidad astronómica | astronomical unit |
| Unidad central | CPU |
| Unidad central de procesamien | Central processing unit |
| unidad central de procesamiento | central processing unit |
| unidad central de proceso | CPU |
| unidad de CD-ROM | CD-ROM reader |
| Unidad de Control Multipunto | Multipoint Control Unit |
| unidad de disco óptico | optical drive |
| unidad de discos | disk drive |
| Unidad de longitud | Length |
| Unidad de masa atómica | Atomic mass unit |
| unidad de medida | unit of measure |
| Unidad de medida de presión | Bar |
| unidad de silvicultura | forestry unit |
| Unidad disco | Disk driver |
| Unidad funcional | Execution unit |
| Unidad internacional | International unit |
| Unidad longitud Rod | Pole |
| unidad militar | corps |
| unidad monetaria | monetary unit |
| Unidad Nacional de la Esperanza | National Unity of Hope |
| Unidad Popular | Unidad Popular |
| unidad principal | mainframe |
| Unidad Revolucionaria Nacional Guatemalteca | Guatemalan National Revolutionary Unity |
| Unidades básicas del SI | SI base unit |
| Unidades de longitud | Length |
| Unidades de Planck | Planck units |
| Unidades de volumen | Volume |
| Unidades derivadas del SI | SI derived unit |
| Unidades Dobson | Dobson unit |
| Unidades geográficas censales de Canadá | Census geographic units of Canada |
| Unidades Planck | Planck units |
| unido | connected |
| Uniejów | Uniejów |
| unificable | unifiable |
| unificación | unification |
| Unificación alemana | Unification of Germany |
| Unificación de Italia | Italian unification |
| Unificación o Muerte | Black Hand |
| unificador | connecting |
| unificar | unify |
| Unified Display Interface | Unified Display Interface |
| Unified Link Layer API | Ulla |
| Unified threat management | Unified threat management |
| uniformado | uniformed |
| uniformar | unify |
| uniforme | equable |
| uniforme deportivo | tracksuit |
| Uniforme escolar japonés | Japanese school uniform |
| uniformemente | uniformly |
| uniformidad | consensus |
| Uniformismo | Uniformitarianism |
| Unikonta | Unikont |
| unilateral | unilateral |
| unilateralismo | unilateralism |
| Unilever | Unilever |
| union | union |
| Union Económica Belgo-Luxemburguesa | Belgium-Luxembourg Economic Union |
| Union Europea | European Union |
| Union Internationale des Chemins de Fer | International Union of Railways |
| Union Pacific | Union Pacific Railroad |
| Union Sportive Arlequine Perpignan | USA Perpignan |
| Union Sportive Créteil-Lusitanos | US Créteil-Lusitanos |
| unionista | unionist |
| Unipartidismo | Single-party state |
| UniPers | Romanization of Persian |
| unir | bind |
| unir con guión | hyphenate |
| Unir dos cosas | Couple |
| unir en matrimonio | unite |
| Uniramia | Uniramia |
| unirse | join |
| unisex | unisex |
| unisexual | unisexual |
| unisonancia | unison |
| unisono | unanimous |
| unitaria | unitarian |
| unitarianismo | Unitarianism |
| unitario | unitarian |
| unitarismo | Unitarianism |
| Unitarismo universalista | Unitarian Universalism |
| United Airlines | United Airlines |
| United Buddy Bears | United Buddy Bears |
| United Center | United Center |
| UNITED for Intercultural Action | UNITED for Intercultural Action |
| United Fruit Company | United Fruit Company |
| United Microelectronics Corporation | United Microelectronics Corporation |
| United Paramount Network | UPN |
| United Parcel Service | United Parcel Service |
| United States Agency for International Development | United States Agency for International Development |
| United States Geological Survey | United States Geological Survey |
| United World Chart | United World Chart |
| unitivo | unitive |
| universal | general |
| Universal Carrier | Universal Carrier |
| Universal Disk Format | Universal Disk Format |
| Universal Media Disc | Universal Media Disc |
| Universal Mobile Telecommunications System | Universal Mobile Telecommunications System |
| Universal Music Group | Universal Music Group |
| Universal Orlando Resort | Universal Orlando Resort |
| Universal Plug and Play | Universal Plug and Play |
| Universal Studios | Universal Studios |
| Universala Deklaracio de Homaj Rajtoj | Universal Declaration of Human Rights |
| universalidad | universality |
| universalmente | universal |
| Universiadas | Universiade |
| universidad | school |
| Universidad americana de Beirut | American University of Beirut |
| Universidad Anáhuac | Universidad Anáhuac |
| Universidad Aristóteles de Tesalónica | Aristotle University of Thessaloniki |
| Universidad Ateneo de Manila | Ateneo de Manila University |
| Universidad Autónoma de Baja California | Universidad Autónoma de Baja California |
| Universidad Autónoma de Barcelona | Autonomous University of Barcelona |
| Universidad Autónoma de Guadalajara | Universidad Autónoma de Guadalajara |
| Universidad Autónoma de Madrid | Autonomous University of Madrid |
| Universidad Autónoma de Nuevo León | Universidad Autónoma de Nuevo León |
| Universidad Autónoma Metropolitana | Universidad Autónoma Metropolitana |
| Universidad Ave María | Ave Maria University |
