O2, O-2, o2, or similar orthography may refer to:
Science and technology
Dioxygen (), the common allotrope of oxygen Oxide (), an ion Superoxide (), an ion Dioxygenyl (), an ion Doubly ionized oxygen (), an ion O(2), the 2-dimensional orthogonal group in group theory O2, an EEG electrode site according to the 10–20 system SGI O2, a Unix workstation computer O2, a class of O-type star Orbital O2, a tidal power turbine in Orkney, Scotland -O2, a compiler optimization tag
Places
The O2, an entertainment district in London, England The O2 Arena, the arena within The O2 O2 Arena (Prague) or Sazka Arena, an arena in Prague, Czech Republic O2 Centre, an indoor shopping and entertainment centre on Finchley Road, London, England O2 Residence, a part of the Jumeirah Lake Towers in Dubai, United Arab Emirates O2 World (Berlin), former branding for Uber Arena, an indoor arena in Berlin, Germany O2 World (Hamburg), former branding for Barclays Arena, an indoor arena in Hamburg, Germany Otoyol 2, a motorway in Turkey called "O2" The O2 (Dublin), the former name of 3Arena Ring 2 (Aarhus), a road in Aarhus, Denmark, which appears as "O2" on signs Ring 2 (Copenhagen), a road in Copenhagen, Denmark, which appears as "O2" on signs The O2 Belfast, an entertainment, education, and leisure destination in Belfast, Northern Ireland
Arts, entertainment and media Film Oxygen (2021 film) or O2, an American-French survival thriller film in production O2 (2020 film), an Estonian-Latvia-Lithuanian-Finnish historical spy thriller film O2 (2022 film), an Indian Tamil language survival thriller film O2 (2024 film), an Indian Kannada language medical thriller film
Music Albums O2 (FireHouse album) (2000) album of the rock band FireHouse O2 (O-Town album) (2002) album by American boy band O-Town O2 (Tonéx album) (2002) album by Gospel singer Tonéx O2: Avalon Remixed, a 2002 album by Avalon O2 (Son of Dave album), 2006 album by Son of Dave
Songs "O2", a song by Orange Range from Panic Fancy "O2", a 2002 song by Sleater-Kinney from One Beat "O2", a song by Suho from Self-Portrait
Other arts, entertainment and media Ö2, a radio service for Austria and South Tyrol O2, a character in Kirby 64: The Crystal Shards UOC O2, institutional repository of the Open University of Catalonia
Businesses and organisations O2 (brand), a global brand name owned by the Spanish telecommunications company Telefónica O2 Store, a chain of retail stores owned and operated by Telefónica Europe, with regional subsidiaries: O2 (Ireland), merged into Three Ireland O2 (UK), a joint venture with Liberty Global O2 Czech Republic Telefónica Germany O2 Slovakia O2 Academy, a chain of music venues O2 Wireless USA or H2O Wireless, a prepaid wireless service by Locus Telecommunications O2TV, a Russian independent TV channel
Vehicles and military Cessna O-2 Skymaster, a military twin-engine light aircraft Douglas O-2, a military single-engine observation biplane GNR Class O2, a class of British steam locomotives classified O2 by both the GNR and the LNER LSWR O2 class, a class of British steam locomotives O 2-class submarine, a class of submarines of the Royal Netherlands Navy Oldershaw O-2, a glider SP&S Class O-2, a 1910 steam locomotives class Taff Vale Railway O2 class, a class of British steam locomotives USS O-2 (SS-63), a 1918 United States O class submarine
Pay grade O-2, a uniformed services pay grade of the United States: First lieutenant (United States) in the Army, Marine Corps, Air Force, and Space Force Lieutenant (junior grade) in the Navy, Coast Guard, Public Health Service Commissioned Corps, and NOAA Commissioned Officer Corps
See also 02 (disambiguation) Oz (disambiguation) 2O (disambiguation) 2Q (disambiguation) Q2 (disambiguation)