| University of Indonesia | University of Ingolstadt | University of Iowa |
| University of Jena | University of Jordan | University of Kansas |
| University of Lausanne | University of Leiden | University of Liverpool |
| University of Lyon | University of Manchester | University of Münster |
| University of Miami | University of Michigan | University of Montenegro Faculty of Biotechnology |
| University of Northern British Columbia | University of Oxford | University of Panama |
| University of Pennsylvania | University of Peshawar | University of Pittsburgh |
| University of Pittsburgh at Bradford | University of Queensland | University of Salamanca |
| University of Salford | University of São Paulo | University of Sheffield |
| University of St Andrews | University of Stanford | University of Stuttgart |
| University of Technology,Iraq-Baghdad | University of Texas at Austin | University of the Arts London |
| University of Toronto | University Of Tripoli Lebanon | University of tromso |
| University of Ulm | University of Washington | University of Waterloo |
| University of Wisconsin | University of York | University Park, Illinois |
| University Park, Iowa | University Park, Maryland | Unix |
| UNIX | Unix File System | Unix filesystem |
| Unix philosophy | Unix shell | UNIX System III |
| UNIX System V | Unix wars | Unix-Like |
| Unix-like | Unknown (2011 film) | Unknown Berlin Gospel |
| Unknown Soldier Memorial (Egypt) | Unladen Swallow | Unlicensed assistive personnel |
| Unmanned aerial vehicle | Unmanned combat aerial vehicle | Unmanned combat air vehicle |
| Unmanned ground vehicle | UNMIK Travel Document | Unnatural Causes: Is Inequality Making Us Sick? |
| Unnur Birna Vilhjálmsdóttir | Uno (card game) | Uno (dicycle) |
| Uno Cygnaeus | Unobtrusive JavaScript | UNODC |
| Unparser | UNPD | UNPO |
| Unpowered flight | Unreachable memory | Unreal 3 |
| Unreal Engine | Unreal Engine 3 | Unreal Tournament |
| Unrepresented Nations and Peoples Organization | Unrequited love | Unrestricted submarine warfare |
| Unsaturated fat | Unsaturated hydrocarbon | Unschooling |
| UNSMIL | Unstoppable (2010 film) | Unstructured data |
| UNStudio | Unsupervised learning | Untangle |
| Unter den Linden | Unterfranken | Unterfranken (region) |
| Unterhaltungssoftware Selbstkontrolle | Untermensch | Until Dawn |
| Untraceable | Ununennium | Ununhexium |
| Ununoctium | Ununpentium | Ununquadium |
| Ununseptium | Ununtrium | UNWTO |
| UO2 | UP | Up (2009 film) |
| UP (complexity) | Up antiquark | Up Close & Personal |
| Up in the Air (2009 film) | Up quark | Up2data |
| Up2date | Upalite | Upanishads |
| Upcycling | Upernavik Airport | Upgrade |
| Upham, North Dakota | Upham, Wisconsin | UPI |
| Upland, Nebraska | Uplands Park, Missouri | Upleward |
| UPnP | Upper alimentary tract | Upper Aulaqi Sheikhdom |
| Upper Austria | Upper Brookville, New York | Upper Cambrian |
| Upper class | Upper Devonian | Upper extremity |
| Upper extremity of femur | Upper extremity of humerus | Upper extremity of radius |
| Upper gastrointestinal bleed | Upper gastrointestinal bleeding | Upper Kalskag, Alaska |
| Upper limb | Upper Marlboro, Maryland | Upper Nyack, New York |
| Upper Ordovician | Upper Palatinate | Upper Permian |
| Upper Pleistocene | Upper respiratory tract | Upper respiratory tract infection |
| Upper-atmospheric lightning | Uprising (2001 film) | UPS Airlines |
| UPS Airlines Flight 1354 | UPS Airlines Flight 6 | Upsala, Minnesota |
| Upselling | Upside-down catfish | Upsilon meson |
| Upsilon Scorpii | UpToDate | Uptodown |
| Upton Sinclair | Upton, Kentucky | Upton, Wyoming |
| UPU | Upupa africana | Upupa antaios |
| Upupa epops | Upward communication | Upwelling |
| Upwork | UPX | Uqba ibn Nafi |
| Urachal cyst | Urachus | Uracil |
| Urals | Uralvagonzavod | Uranian |
| Uraninite | Uranium | Uranium carbide |
| Uranium hexafluoride | Uranium in the environment | Uranium pentafluoride |
| Uranium(VI) fluoride | Uranium-233 | Uranium-235 |
| Uranium-238 | Urara Takano | Urartu |
| Urate oxidase | Urawa Red Diamonds | Urb. |
| Urbain Le Verrier | Urban agglomeration | Urban agriculture |
| Urban area | Urban climate | Urban districts of Germany |
| Urban heat island | Urban legend | Urban Lesjak |
| Urban lumberjacking | Urban Partnership Bank | Urban semiotics |
| Urban sprawl | Urban township | Urban warfare |
| Urban-type settlement | Urbana, Illinois | Urbana, Iowa |
| Urbancrest, Ohio | Urbandale, Iowa | Urbanization |
| Urbanized Area | Urbank, Minnesota | Urbano Rattazzi |
| Urbeis | Urby Emanuelson | Urdu |
| Urdu Wikipedia | Urea | Urea cycle |
| Urea cycle disorder | Urease | Urech hydantoin synthesis |
| Urechis unicinctus | Ureidopenicillin | Uremia |
| Urenco Group | Ureter | Ureteral branches of renal artery |
| Ureteritis | Urethra | Urethral artery |
| Urethritis | Urginea maritima | Urho Kekkonen |
| URI | Uri Ariel | Uri Avnery |
| Uri Davis | Uri Gavriel | Uri Maklev |
| Uri Sebag | Uric acid | Uriel da Costa |
| Urinal | Urinary bladder | Urinary bladder cancer |
| Urinary catheterization | Urinary incontinence | Urinary meatus |
| Urinary retention | Urinary system | Urinary tract infection |
| Urinary urgency | Urination | Urine |
| Urine anion gap | Urine osmolality | URL |
| Url | URL redirection | URL shortening |
| URLTEAM | Urmatt | Urmila Matondkar |
| Urnfield culture | Urochloa | Urochloa leersioides |
| Urochloa mutica | Urochloa reptans | Urochordata |
| Urocolius | Urocolius indicus | Urocolius macrourus |
| Urocyon cinereoargenteus | Urocyon littoralis | Urodela |
| Urogenital tuberculosis | Urohidrosis | Urokinase |
| Urolagnia | Urology | Uromastyx |
| Uromastyx aegyptia | Uromastyx benti | Uromastyx leptieni |
| Uromastyx loricata | Uromastyx ornata | Uromastyx thomasi |
| Uromastyx yemenensis | Uropodidae | Uropsilus |
