List of acronyms: U

(Main list of acronyms)

U – Uranium
U&E – Urea and electrolytes, see also Basic metabolic panel

UA

UA – Ukraine Unit of Action
UAAP – University Athletic Association of the Philippines
UAB
* Universitat Autònoma de Barcelona
* University of Alabama at Birmingham
* Upravlyayemaya aviatsionnaya bomba
UAE – United Arab Emirates
UAH
* Ukrainian hryvnia
* University of Alabama in Huntsville
UAR
* Uniformly At Random
* Unión Argentina de Rugby
* United Arab Republic
UAV – Unmanned Aerial Vehicle

UB

UBA – Unbundled Bitstream Access
UBC
* United Baptist Church
* University of British Columbia
UBE – Uniform Bar Examination
UBI – Universal basic income
UBIGEO – Ubicación Geografica
UBS – Union Bank of Switzerland

UC

UCAV – Unmanned Combat Air Vehicle
UCBSA – United Cricket Board of South Africa
UCF – University of Central Florida
UCI
* Union Cycliste Internationale
* University of California, Irvine
UÇK – initialism for two Albanian guerrilla movements
UCLA – University of California, Los Angeles
UCLES – University of Cambridge Local Examinations Syndicate
UCR
* University of Costa Rica
* University of California, Riverside
UCS – Union of Concerned Scientists
UCSB – University of California, Santa Barbara
UCSD – University of California, San Diego

UD

UE

UE – Unit of Employment
UEFA – Union of European Football Associations
UEFI - Unified Extensible Firmware Interface
UESAC – Uppsala-ESO Survey of Asteroids and Comets

UF

UG

UH

UHF – Ultra High Frequency
UHMW – Ultra-high-molecular-weight polyethylene
UHRB – Ultra-High Resolution Building
UHSP – University of Health Sciences and Pharmacy (in St. Louis)
UHNWIs - Ultra High Net Worth Individuals Investopedia and Wikipedia

UI

UIC – University of Illinois Chicago
UID – User ID
uig – Uyghur language
UIL – University Interscholastic League
UIUC – University of Illinois Urbana-Champaign
UIW – University of the Incarnate Word

UJ

UJTL – Universal Joint Task List
UJT – Unijunction transistor

UK

UL

UL – Underwriters Laboratories
ULEB – Union des ligues européens de basket-ball, French for "Union of European Basketball Leagues"
ULF – Ultra Low Frequency
ULOF – unprotected loss of flow
ULOHS – unprotected loss of heat sink
UTOP – unprotected transient overpower

UM

UN

UP

UP
* Ukraine
* Union Pacific Railroad
* Upper Peninsula
* Uttar Pradesh
UPC
* United Pentecostal Church
* Universal Product Code
UPDA – Uganda People's Democratic Army
UPdM – Università Popolare della Multimedialità
UPDM – Unified Profile for DoDAF/MODAF
* Unified Modeling Language Profile for DoDAF and MoDAF
* Unité de psychiatrie du développement mental
* Universal Pattern Decomposition Method
* Unix Power Device Management
* Unpressurized Docking Mast
* Urban Planning, Design and Management
UPF – Universitat Pompeu Fabra
UPI – United Press International
UPN – United Paramount Network
UPS
* Uninterruptible Power Supply
* United Parcel Service
UPT – Universal Personal Telecommunications
UPTN – Upper Peninsula Telehealth Network
UPU – Universal Postal Union

UR

ur – Urdu language
UR – Soviet Union
URBSFA – Union royale belge des sociétés de football association
URC
* Uganda Railways Corporation
* United Rugby Championship
* Utility regulatory commission
urd – Urdu language
URD – User requirements document
URI
* Uniform Resource Identifier
* University of Rhode Island
URL – Uniform Resource Locator
URU – Uruguay
URY – Uruguay

US

US – United States
* United States of America
* United States Army
USAF – United States Air Force
USAFSPC – U.S. Air Force Space Command
USAACE – United States Army Aviation Center of Excellence, Fort Rucker, Alabama
USAADAC – United States Army Air Defense Artillery School, Fort Sill, Oklahoma
USAAS – United States Army Armor School, Ft. Benning, Georgia
USAIC
* U.S. Army Infantry Center
* U.S. Army Intelligence Center
USAID – United States Agency for International Development
USAP
* Union Sportive des Arlequins Perpignanais
* United States Antarctic Program
USAPATRIOT – Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism
USAREUR – United States Army Europe
USB – Universal Serial Bus
USC
* United States Code
* University of South Carolina
* University of Southern California
USCG – United States Coast Guard
USCINCSPACE – United States Commander in Chief, Space Command
USD
* United States dollar
USD – Under Secretary of Defense for Acquisition and Sustainment
ASD Under Secretary of Defense for Research and Engineering
USD – Under Secretary of Defense (Comptroller)
USDA – United States Department of Agriculture
USDI – United States Department of the Interior
USDOE – United States Department of Energy
USD – Under Secretary of Defense for Intelligence
USDPR – Under Secretary of Defense for Personnel and Readiness
USDP – Under Secretary of Defense for Policy
USDRE – Under Secretary of Defense for Research and Engineering
USEC – United States Enrichment Corporation
USFL – United States Football League, two different leagues of American football, one [United States Association football|Football League|operating from 1983–1985] and the second operating in 2022 and 2023
USFWS – United States Fish and Wildlife Service
USGS – United States Geological Survey
USIA – United States Information Agency
USJFCOM – United States Joint Forces Command
USL
* United Soccer League, a governing body for several lower-level leagues in the United States
* United Soccer League, the former name of a league operated by the above organization that now plays at the second U.S. level as the USL Championship
* United Soccer League, a completely different soccer league that operated in 1984 and 1985
* University of Southwestern Louisiana, a former name for the school now known as the University of Louisiana at Lafayette
USLC – USL Championship
USLS – USL Super League
USLW
* USL W-League, a women's soccer league operated by the United Soccer League organization from 1995 to 2015
* USL W League, another women's league operated by the same organization that started play in 2022
USMC – United States Marine Corps
USMLE – United States Medical Licensing Examination
USMNT – United States men's national (soccer) team
USN – United States Navy
USNA – United States National Arboretum – United States Naval Academy
USNB – United States Naval Base
USNG – United States National Grid
USNH – United States Naval Hospital
USNI – United States Naval Institute
USNO – U.S. Naval Observatory
USNOFS – United States Naval Observatory Flagstaff Station
USNP – United States Newspaper Program
USNR – United States Navy Reserve
USNS – United States Naval Ship
USNY – University of the State of New York
USNZ – University Sport New Zealand
USP – Unique Selling Point
USPS – United States Postal Service
USPTO – United States Patent and Trademark Office
USR
* Universal System Resources
* User
USS – United States ship
USSPACECOM – United States Space Command
USSR – Union of Soviet Socialist Republics
UST – Underground Storage Tank
USTRANSCOM – United States Transportation Command
USWNT – United States women's national (soccer) team

UT

UT – Universal Time
UTEP – University of Texas at El Paso
UTM – Universal Transverse Mercator
UTRGV – University of Texas Rio Grande Valley
UTSA – University of Texas at San Antonio

UU

UU – Unitarian Universalism – University of Utah – Unseen University
UUA – Unitarian Universalist Association
UUID – Universally Unique Identifier
UUV – Unmanned Underwater Vehicle

UV

UV – Burkina Faso – ultraviolet
UVM
* Universal Verification Methodology
* Universidad del Valle de México
* University of Vermont, from its Latin name of Universitas Viridis Montis
* UV mapping

UW

UX

UXO – Unexploded ordnance

UY

UY – Uruguay --Up yours
UYU – Uruguayan peso uruguayo

UZ