| Under Rug Swept | Under Satanæ | Under the Boardwalk |
| Under The Boardwalk | Under the Boardwalk (песня) | Under the Bridge |
| Under the Gun (альбом Poco) | Under the Gun (песня The Sisters of Mercy) | Under The Influence |
| Under the Influence | Under the Influence (альбом Overkill) | Under the Influence (альбом Warrant) |
| Under the Iron Sea | Under the Iron Sea Tour | Under the Ladder |
| Under the Mistletoe | Under the Moonspell | Under the Pink |
| Under the Radar Over the Top | Under the Red Cloud | Under the Red Sky |
| Under the Sign of Hell | Under The Sign Of Hell | Under the Sign of the Black Mark |
| Under the Table and Dreaming | Underclass Hero | Underclass Hero (песня) |
| Undercode | Undercover | Undercover: Operation Wintersonne |
| Undercovers | Underdog | Underground |
| Underground (альбом) | Underground: VooDoo Night Sessions | Underneath |
| Underneath the Colours | Underneath Your Clothes | Undernet |
| Underoath | UnderOATH | Underrail |
| Underscore | Underscore.js | Undertaker |
| Undertale | Undertow | Underw. |
| Underwater Berets | Underwood Typewriter Company | Underwoodisaurus milii |
| Underworld | Underworld (группа) | Underworld: New Dawn |
| Underwriter | Underwriters Laboratories | Undine |
| Undisclosed Desires | Undisputed | Undisputed (Ludacris) |
| Undisputed (песня) | Undisputed 2 | Undisputed Attitude |
| Undo (песня Санны Нильсен) | UNDOF | Undorosaurus |
| UNDP | Undrop | Undulatus asperatus |
| Une enfant du siècle | Une jeune fillette | Une jeune pucelle |
| Une Vie D'Amour | Une vie d'amour | Une vie d’amour |
| Une vie de chat | Unearth | Unearthed |
| Uneasy Listening Vol. 1 | Uneasy Listening Vol. 2 | UNECE |
| Unenlagia | Unenlagiinae | UNEP |
| UNESCO | UNESCO-IHE | Unescoceratops |
| Unescoceratops koppelhusae | Unespichnium | UNetbootin |
| Uneven Beats | Uneven structure | Uneven Structure |
| Unexpand | Unexpected | Unexpected (альбом Энджи Стоун) |
| UNF | Unfabulous | Unfair Science Fair |
| Unfaithful | Unfinished Music No. 2: Life With The Lions | Unfinished Music No.1: Two Virgins |
| Unfinished Music No.2: Life with the Lions | Unfinished Music No.2: Life With The Lions | Unfinished Sympathy |
| Unforgettable | Unforgettable (песня) | Unforgiven (2005) |
| Unforgiven (2007) | Unforgiven (2008) | Unformal |
| UNFPA | Unfriendly Skies (CSI) | Ungenennte Heidenthume |
| Unger | Ungernia | Ungnadia |
| Ungnadia speciosa | Ungoliant | Unguiculariella |
| Unguiculariella bhutanica | Unhate | Unhate (рекламная кампания кампания) |
| Unhate (рекламная кампания) | Unhate (коммуникационная кампания Benetton Group) | Unhate (коммуникационная кампания) |
| UNHCR | Unheilig | Unholan urut |
| Unholy | Unholy (альбом) | Unholy (значения) |
| Unholy (песня) | Unholy Crusade | Unholy Cult |
| UNI | Uni Air | Unia |
| Unia Films S.A. | UNIAN | Uniao International de Capoeira Regional |
| UNIATEC | União Africana | União Internacional de Capoeira Regional |
| Unión Africana | Unibail-Rodamco | Unibank |
| Unibet | Unibet Open | Unibet.com |
| Unibet.com (велокоманда) | Unibuffel | Unibus |
| Unicamente Celentano | UNICAR | Unicast |
| UNICEF | UNICEF Open | UNICEF Open 2010 |
| UNICEF Open 2011 | UNICEF Open 2012 | Unicheck |
| Unico | Unicode | UNICODE |
| Unicode 6.1.0 | Unicoi County, Tennessee | Uniconf |
| Unicorn | Unicorn (band) | Unicorn (альбом Tyrannosaurus Rex) |
| Unicorn (альбом) | Unicorn (веб-сервер) | Unicorn (группа) |
| Unicos | UniCOS | UniCredit |
| Unicredit | UniCredit Bank | UniCredit Bank (Украина) |
| UniCredit Czech Open | UNICubeSAT | UNIDO |
| Unie van Suid-Afrika | UNIFFAC | Unification |
| Unification Theological Seminary | Unified Communications | Unified Extensible Firmware Interface |
| Unified Medical Language System | Unified Modeling Language | Unified Parallel C |
| Unified Process | Unified Thread Standard | Unified threat management |
| Unified Video Decoder | UNIFIL | Unifolium bifolium |
| Unifolium quadrifidum | Unifon | Uniform Memory Access |
| Uniform Office Format | Uniform resource identifier | Uniform Resource Identifier |
| Uniform Resource Locator | Uniform Resource Name | Unify |
| Unigenitus | Unigine | UNIGINE Corp. |
| Unigine Engine | Unigine Heaven Benchmark | Unigraphics |
| Unigraphics (NX) | Unigraphics NX | Uniklubi |
| Unikonta | UNIL | Unilever |
| UNIMA | UNIMARC | UNIMED |
| Unimedia | Unimog | Uninhabited Planet Survive |
| Uninhabited Planet Survive! | Uninstaller | Unintended |
| Uninterruptable Power Supply | Uninterruptible Power Supply | Uninvited |
| Uninvited (игра) | Uninvited (песня) | Unio |
| Unio crassus | Unio pictorum | UNION |
| Union | Union (SQL) | Union (альбом) |
| Union (журнал) | Union (значения) | Union (компания) |
| Union Aerospace Corporation | Union africaine | Union économique et monétaire ouest-africaine |
| Union Black | Union Boxing Promotion | Union Card |
| Union City, New Jersey | Union County, Arkansas | Union County, Florida |
| Union County, Georgia | Union County, Illinois | Union County, Iowa |
| Union County, Mississippi | Union County, New Jersey | Union County, New Mexico |
| Union County, North Carolina | Union County, Ohio | Union County, Tennessee |
| Union Cycliste Internationale | Union cycliste internationale | Union de transports aériens |
| Union de Transports Aériens | Union der deutschen Akademien der Wissenschaften | Union des Transports Aériens |
| Union Européenne de Cyclisme | Union Flag | Union Gap |
| Union Glashütte | Union Internationale des Associations d'Alpinisme | Union J |
| Union Jack | Union mount | Union Movement |
| Union Observatory | Union Observatory Annex | Union of European Football Associations |
| Union of South Africa | Union Pacific | Union Pacific 3985 |
| Union Pacific 844 | Union Pacific 8444 | Union Pacific Big Boy |
| Union Pacific Challenger | Union Pacific Railroad | Union Parish, Louisiana |
| Union Pasific Big Boy | Union Pay | Union sportive bressane |
| Union sportive bressane Pays de l'Ain | Union sportive carcassonnaise XV | Union sportive dacquoise |
| Union Sportive de Ouagadougou | Union Sportive du Foyer de la Régie Abidjan-Niger | Union sportive Oyonnax rugby |
| Union Square (BMT Canarsie Line) | Union Street (BMT Fourth Avenue Line) | Union Theological Seminary |
