- U ... UAS
- UAV ... UCéDé
- uchastok hospital ... UDP-glucose
- UDPM ... Ugric languages
- UGT ... Ukraine, flag of
- Ukraine, history of ... Uljanovsk
- Ull ... último adiós
- ultimobranchial gland ... Ulysses
- Ulzana’s Raid ... Ume?
- Ume? IK ... Unapologetic
- Unarm, Eros ... Under the Dome
- Under the Gaslight ... Underworld
- Underworld U.S.A. ... Unholy Wife, The
- Unhook the Stars ... Union
- Union ... Unión Sindical Obrera
- Union Solidarity and Development Association ... unitary state
- unitary system ... United Lutheran Church in America
- United Malays National Organization ... United Presbyterian Church in the U.S.A.
- United Press ... United States Naval Observatory
- United States Naval Research Laboratory ... United States v. Holmes
- United States v. Isaac Williams ... Universal Exposition
- Universal Federation of Pagans ... University College
- University College ... UNR
- Unraveling Juvenile Delinquency ... ununbium
- ununhexium ... upland cress
- upland cypress ... Uppsala school
- Uppsala Universitet ... uraniid moth
- Uraniidae ... urbanization
- Urbarial Patent ... urinary blood fluke
- urinary incontinence ... Ursino Castle
- Ursins, Marie-Anne de la Trémoille, princesse des ... usage labeling
- Usages of Barcelona ... Usole-Sibirskoe
- Usolje-Sibirskoje ... Utah Jazz
- Utah Lake ... Utrecht, treaties of
- Utrecht, Union of ... Uzan, Cem
- Uzan, Cem Cengiz ... Uzziah
