| Unit testing | Unitarianism | Unitary authority |
| Unitary state | Unité d'Habitation | United 93 (film) |
| United Aircraft Corporation | United Airlines | United Airlines Flight 173 |
| United Airlines Flight 175 | United Airlines Flight 232 | United Airlines Flight 608 |
| United Airlines Flight 610 | United Airlines Flight 624 | United Airlines Flight 93 |
| United Arab Airlines Flight 869 (1962) | United Arab Airlines Flight 869 (1963) | United Arab Emirates |
| United Arab Emirates Air Force | United Arab Emirates dirham | United Arab Emirates football competitions |
| United Arab Emirates parliamentary election, 2006 | United Armenia | United Artists |
| United Buddy Bears | United Kingdom | United Kingdom of Great Britain and Ireland |
| United Kingdom of Great Britain and Northern Ireland | United Linux | United Nations |
| United Nations Charter | United Nations Climate Change conference | United Nations Commission on Human Rights |
| United Nations Conference on the Standardization of Geographical Names | United Nations Conference on Trade and Development | United Nations Convention against Corruption |
| United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances | United Nations Convention against Torture | United Nations Convention on Contracts for the International Sale of Goods |
| United Nations Convention to Combat Desertification | United Nations Development Program | United Nations Development Programme |
| United Nations Economic and Social Council | United Nations Economic Commission for Europe | United Nations Educational, Scientific and Cultural Organization |
| United Nations Environment Programme | United Nations Fact Finding Mission on the 2014 Israel–Gaza conflict | United Nations Fact Finding Mission on the Gaza Conflict |
| United Nations Framework Convention on Climate Change | United Nations General Assembly | United Nations General Assembly Resolution 3379 |
| United Nations General Assembly Resolution 46/86 | United Nations High Commissioner for Refugees | United Nations Human Rights Council |
| United Nations Industrial Development Organization | United Nations Integrated Mission in East Timor | United Nations Interim Administration Mission in Kosovo |
| United Nations Interim Force in Lebanon | United Nations laissez-passer | United Nations Office of the High Representative for the Least Developed Countries, Landlocked Developing Countries and Small Island Developing States |
| United Nations Office on Drugs and Crime | United Nations Parliamentary Assembly | United Nations Partition Plan for Palestine |
| United Nations Population Fund | United Nations Security Council | United Nations Security Council Resolution 1701 |
| United Nations Security Council Resolution 2042 | United Nations Security Council Resolution 2043 | United Nations Security Council Resolution 233 |
| United Nations Security Council Resolution 234 | United Nations Security Council Resolution 235 | United Nations Security Council Resolution 236 |
| United Nations Security Council Resolution 237 | United Nations Security Council Resolution 240 | United Nations Security Council Resolution 242 |
| United Nations Security Council Resolution 338 | United Nations Security Council Resolution 339 | United Nations Security Council Resolution 340 |
| United Nations Security Council Resolution 341 | United Nations Security Council Resolution 346 | United Nations Security Council Resolution 362 |
| United Nations Security Council Resolution 363 | United Nations Security Council Resolution 368 | United Nations Security Council Resolution 369 |
| United Nations Security Council Resolution 660 | United Nations Security Council Resolution 661 | United Nations Security Council Resolution 662 |
| United Nations Security Council Resolution 678 | United Nations Security Council Resolution 681 | United Nations Security Council Resolution 687 |
| United Nations Security Council Resolution 694 | United Nations Security Council Resolution 726 | United Nations Security Council Resolution 799 |
| United Nations Supervision Mission in Syria | United Nations Support Mission in Libya | United Nations Transitional Administration in East Timor |
| United Parcel Service | United Press International | United Principalities |
| United Provinces of Central Italy | United Russia | United States |
| United States Adopted Name | United States Africa Command | United States Air Force |
| United States Air Force Academy | United States Air Force Thunderbirds | United States Army |
| United States Atomic Energy Commission | United States Attorney | United States bombing of the Chinese embassy in Belgrade |
| United States box office records | United States Census Bureau | United States Census, 2000 |
| United States Census, 2010 | United States Coast Guard | United States Conference of Catholic Bishops |
| United States Congress | United States Constitution | United States copyright law |
| United States Cultural Exchange Programs | United States customary units | United States Department of Agriculture |
| United States Department of Defense | United States Department of Energy | United States Department of Health and Human Services |
| United States Department of State | United States Department of Veterans Affairs | United States diplomatic cables leak |
| United States dollar | United States Environmental Protection Agency | United States fiscal cliff |
| United States Fish and Wildlife Service | United States Geological Survey | United States Holocaust Memorial Museum |
| United States House of Representatives | United States Medical Licensing Examination | United States Military Academy |
| United States National Academy of Sciences | United States National Library of Medicine | United States national missile defense |
| United States Navy | United States occupation of the Dominican Republic (1965–66) | United States of Africa |
| United States of America | United States Olympic Committee | United States passport |
| United States Pharmacopeia | United States Poet Laureate | United States presidential election, 2016 |
| United States Secretary of Commerce | United States Secretary of the Treasury | United States Senate |
| United States Senate Committee on Environment and Public Works | United States Senate Committee on Foreign Relations | United States Senate Committee on Veterans' Affairs |
| United States Supreme Court | United States Virgin Islands | United States women's national soccer team |
| United States-Iran relations | United we stand, divided we fall | United World College Maastricht |
| United World College of the Adriatic | United World Colleges | Unitrans |
| Units of information | Units of measurement | Units of textile measurement |
| Unity (game engine) | Unity (logiciel) | Unity (user interface) |
| Unity Cooperative Company | Unity Linux | Unity Village, Missouri |
| Unity, Clark County, Wisconsin | Unity, Oregon | Unity, Trempealeau County, Wisconsin |
| Unity, Wisconsin | Universal (metaphysics) | Universal algebra |
| Universal approximation theorem | Universal Declaration of Human Rights | Universal design |
| Universal Disk Image Format | Universal gateway | Universal grammar |
| Universal Media Disc | Universal monarchy | Universal Music Group |
| Universal Pictures | Universal Plug and Play | Universal property |
| Universal Serial Bus | Universal set | Universal Soldier (1992 film) |
| Universal Soldier: Day of Reckoning | Universal space | Universal Studios |
| Universal Time | Universalism | Universality (philosophy) |
| Universality–diversity paradigm | Universe | Universita Cattolica del Sacro Cuore |
| Universitas 21 | Universitat zu Wien | Université Hassiba Ben Bouali chlef |
| Université islamique de Say | Universities & Colleges Admissions Service | University |
| University City, Missouri | University College Dublin A.F.C. | University College of Opera |
| University Heights, Iowa | University of al-Jazirah | University of al-Qarawiyyin |
| University of Belgrade | University of Berne | University of Birmingham |
| University of Bologna | University of Bolton | University of British Columbia |
| University of Cairo | University of California | University of California Press |
| University of California, Berkeley | University of California, Irvine | University of California, Santa Barbara |
| University of Cambridge | University of Castilla–La Mancha | University of Chicago |
| University of Colorado Boulder | University of Colorado Denver | University of Debrecen |
| University of Denver | University of Dundee | University of Engineering and Technology, Lahore |
| University of Exeter | University of Ferrara | University of Florida |
| University of Fribourg | University of Göttingen | University of Georgia |
| University of Gloucestershire | University of Guadalajara | University of Hanover |
| University of Helsinki | University of Illinois at Chicago | University of Illinois at Urbana–Champaign |
| 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 |
