O2, O-2, o2, O2, or O2 may refer to:

O2, O-2, o2, O2, or O2 may refer to:

Science and technology

O2, an allotrope of the chemical element oxygen

O2, an EEG electrode site according to the 10-20 system

SGI O2, a Unix workstation computer

UOC O2, institutional repository of the Open University of Catalonia


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), an indoor arena in Berlin, Germany

O2 World (Hamburg), an indoor arena in Hamburg, Germany

Otoyol 2, a motorway in Turkey called "O2"

Arts, enertainment, and media



O2 (FireHouse album) (2000)

O2 (O-Town album) (2002)

O2 (Tonéx album) (2002)

O2: Avalon Remixed, a 2002 album by Avalon


"O2", a song by Orange Range from Panic Fancy

"O2", a 2002 song by Sleater-Kinney from One Beat

Other arts, entertainment, and media

Ö2, a radio service for Austria and South Tyrol

O2, a character in Kirby 64: The Crystal Shards

Businesses and organisations

O2, trading name for Telefónica Europe, a European telecommunications provider

O2 Store, a chain of retail stores owned and operated by Telefónica Europe

Regional subsidiaries:

O2 (Ireland)

O2 (UK)

O2 Czech Republic

Telefónica Germany

Telefónica Slovakia

O2 Academy, a chain of music venues

O2 Global Network, an international network for sustainable design

O2 Wireless USA or H2O Wireless, a prepaid wireless service by Locus Telecommunications

O2TV, a Russian independent socially political TV channel


Cessna O-2 Skymaster, a military twin-engine light aircraft

Douglas O-2, a military single-engine observation biplane

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

USS O-2 (SS-63), a United States O class submarine

Other uses

O-2, a pay grade in the US uniformed services

First Lieutenant in the Army, Air Force, and Marine Corps

Lieutenant (junior grade) in the Navy, Coast Guard, Public Health Service Commissioned Corps, and NOAA Commissioned Officer Corps

See also

02 (disambiguation)

Oz (disambiguation)

Oxide ion, chemical formula O2−

Superoxide, chemical formula O−2

Dioxygenyl, O+2