| urogallo | grouse |
| urogallo de las artemisas | sage grouse |
| Urolagnia | Urolagnia |
| urología | urology |
| Urolophidae | Round ray |
| urológico | urologic |
| Uroplatus | Uroplatus |
| Uroplatus fimbriatus | Uroplatus fimbriatus |
| Uropygi | Uropygid |
| uroscopía | uroscopy |
| urostomía | urostomy |
| Urpmi | Urpmi |
| urraca | jay |
| urraca azul | blue jay |
| urraca de América | blue jay |
| Urraca de León y Castilla | Urraca of Castile |
| Urraca Fernández | Urraca Fernández |
| Ursenbach | Ursenbach |
| Ursidae | ursid |
| Ursins | Ursins |
| Urso | Bear |
| URSS | USSR |
| Ursula Andress | Ursula Andress |
| Ursus | Ursus |
| Ursus americanus | American Black Bear |
| Ursus americanus kermodei | Kermode bear |
| Ursus arctos | Brown Bear |
| Ursus arctos crowtheri | Atlas Bear |
| Ursus arctos isabellinus | Himalayan Brown Bear |
| Ursus arctos syriacus | Syrian Brown Bear |
| Ursus maritimus | Polar bear |
| Ursus thibetanus | Asiatic Black Bear |
| Ursy | Ursy |
| Urtenen-Schönbühl | Urtenen-Schönbühl |
| Urtica ferox | Ongaonga |
| Urtica urens | Urtica urens |
| Urticaceae | Urticaceae |
| Urticales | Urticales |
| urticaria | hives |
| Uruapan | Uruapan |
| Uruguaiana | Uruguaiana |
| Uruguay | Uruguay |
| Uruguay Montevideo Fútbol Club | Uruguay Montevideo |
| uruguayo | Uruguayan |
| Uruk | Uruk |
| Urukagina | Urukagina |
| Urusei Yatsura | Urusei Yatsura |
| urushiol | urushiol |
| Uryû Ishida | Uryū Ishida |
| Uryū Ishida | Uryū Ishida |
| urálico | Uralic |
| uréter | ureter |
| Urías | Uriah |
| Urías el hitita | Uriah the Hittite |
| Urðr | Urd |
| Uróboros | Ouroboros |
| urólogo | urologist |
| usabilidad | usability |
| usado | worn-out |
| Usagi Tsukino | Sailor Moon |
| Usagi Yojimbo | Usagi Yojimbo |
| Usak | Uşak Province |
| usanza | custom |
| usar | employ |
| usar algo en contra de alguien | use something against someone |
| usar de | apply |
| usar de blanco | snipe at |
| usar equívocos | equivocate |
| usar mal | misapply |
| usar maniobras obstruccionistas | filibuster |
| Usatges de Barcelona | Usages of Barcelona |
| USB | Universal Serial Bus |
| USB mass storage device class | USB mass storage device class |
| Usedom | Usedom |
| User Mode Linux | User-mode Linux |
| Userbar | Userbar |
| Userkaf | Userkaf |
| Userkara | Userkare |
| ushanka | ushanka |
| Ushebti | Ushabti |
| Ushuaia | Ushuaia |
| USIM | Universal Subscriber Identity Module |
| USL First Division | USL First Division |
| Uslar | Uslar |
| uslero | rolling pin |
| Usnea | Usnea |
| uso | application |
