UO may stand for:

Arts and entertainment

* '' Call of Duty: United Offensive'', an expansion pack for the popular first-person shooter computer game, ''Call of Duty'' * ''

Ultima Online ''Ultima Online'' (''UO'') is a fantasy massively multiplayer online role-playing game (MMORPG) released on September 24, 1997 by Origin Systems. Set in the '' Ultima'' universe, it is known for its extensive player versus player combat syste ...

'', a graphical massively multiplayer online role-playing game *

Underoath Underoath (styled as Underøath or UnderOath) is an American rock band from Tampa, Florida. It was founded by lead vocalist Dallas Taylor and guitarist Luke Morton in 1997 in Ocala, Florida; subsequently, its additional members were from Tamp ...

, an American Christian metalcore band from Tampa, Florida *

Urge Overkill Urge Overkill is an American alternative rock band, formed in Chicago in 1986, consisting of Nathan Kaatrud, who took the stage name Nash Kato (vocals/guitar), and Eddie "King" Roeser (vocals/guitar/bass). They are widely known for their song " ...

, an alternative rock band, formed in Chicago, United States

Businesses and organizations

Businesses

Universal Orlando Universal Orlando Resort, often shortened to Universal Orlando, is a theme park and entertainment resort complex located in Orlando, Florida. It is the flagship of the Universal Destinations & Experiences theme park chain. Following the succe ...

, a theme park resort in Orlando, Florida *

Urban Outfitters Urban Outfitters, Inc. (URBN) is a multinational lifestyle retail corporation headquartered in Philadelphia, Pennsylvania. Operating in the United States, the United Kingdom, Canada, select Western European countries, Poland, the United Arab Em ...

, a publicly traded American company * Hong Kong Express Airways (IATA code: UO), an airline based in Hong Kong

Universities

* University of Okara, a public university in Okara, Punjab, Pakistan *

University of Oregon The University of Oregon (UO, U of O or Oregon) is a Public university, public research university in Eugene, Oregon, United States. Founded in 1876, the university is organized into nine colleges and schools and offers 420 undergraduate and gra ...

, a public research university in Eugene, Oregon, USA *

University of Osnabrück A university () is an institution of tertiary education and research which awards academic degrees in several academic disciplines. ''University'' is derived from the Latin phrase , which roughly means "community of teachers and scholars". Univ ...

, public university in Osnabrück, Lower Saxony, Germany *

University of Otago The University of Otago () is a public university, public research university, research collegiate university based in Dunedin, Otago, New Zealand. Founded in 1869, Otago is New Zealand's oldest university and one of the oldest universities in ...

, a public university in Dunedin, New Zealand * University of Oradea, a public university in Oradea, Romania *

University of Ottawa The University of Ottawa (), often referred to as uOttawa or U of O, is a Official bilingualism in Canada, bilingual public research university in Ottawa, Ontario, Canada. The main campus is located on directly to the northeast of Downtown Ot ...

, a public university in Canada *

University of Oxford The University of Oxford is a collegiate university, collegiate research university in Oxford, England. There is evidence of teaching as early as 1096, making it the oldest university in the English-speaking world and the List of oldest un ...

, a public university in United Kingdom

Other organizations

Orthodox Union The Orthodox Union (abbreviated OU) is one of the largest Orthodox Jewish organizations in the United States. Founded in 1898, the OU supports a network of synagogues, youth programs, Jewish and Religious Zionist advocacy programs, programs f ...

, a kosher certification service which places a "U inside O" logo on food packaging

Other uses

Unexploded ordnance Unexploded ordnance (UXO, sometimes abbreviated as UO) and unexploded bombs (UXBs) are explosive weapons (bombs, shell (projectile), shells, grenades, land mines, naval mines, cluster munition, and other Ammunition, munitions) that did not e ...

, explosive weapons that did not explode when they were employed *

Urate oxidase The enzyme urate oxidase (UO), uricase or factor-independent urate hydroxylase, absent in humans, catalyzes the oxidation of uric acid to 5-hydroxyisourate: :Uric acid + O2 + H2O → 5-hydroxyisourate + H2O2 : 5-hydroxyisourate + H2O → 2- ...