On, on, or ON may refer to:

Arts and entertainment

Music

On (band) ON was a solo project of Ken Andrews, which he started after the breakup of his previous band, Failure. The music of ON was not unlike that of Failure in terms of songwriting, but the overall sound was more based on electronics, with less empha ...

, a solo project of Ken Andrews * ''On'' (EP), a 1993 EP by Aphex Twin * ''On'' (Echobelly album), 1995 * ''On'' (Gary Glitter album), 2001 * ''On'' (Imperial Teen album), 2002 * ''On'' (Elisa album), 2006 * ''On'' (Jean album), 2006 * ''On'' (Boom Boom Satellites album), 2006 * ''On'' (Tau album), 2017 * "On" (song), a 2020 song by BTS * "On", a song by Bloc Party from the 2006 album '' A Weekend in the City''

Other media

* '' Ön'', a 1966 Swedish film * On (Japanese prosody), the counting of sound units in Japanese poetry * ''On'' (novel), by Adam Roberts *

ONdigital ITV Digital was a British digital terrestrial television Broadcasting, broadcaster which launched a pay-TV service on the world's first digital terrestrial television network. Its main shareholders were Carlton Communications plc and Granada ...

, a failed British digital television service, later called ITV Digital * Overmyer Network, a former US television network

Places

On (Ancient Egypt) Heliopolis (I͗wnw, Iunu or 𓉺𓏌𓊖; egy, I͗wnw, 'the Pillars'; cop, ⲱⲛ; gr, Ἡλιούπολις, Hēlioúpοlis, City of the Sun) was a major city of ancient Egypt. It was the capital of the 13th or Heliopolite Nome of Lower Eg ...

, a Hebrew form of the ancient Egyptian name of Heliopolis * On, Wallonia, a district of the municipality of

Marche-en-Famenne Marche-en-Famenne (, literally ''Marche in Famenne''; wa, Måtche-el-Fåmene, ) is a city and municipality of Wallonia located in the Belgian province of Luxembourg. The municipality consists of the following districts: Aye, Hargimont, Hum ...

Ahn, Luxembourg Ahn (Luxembourgish: ''Ohn'') is a wine-growing village in the municipality of Wormeldange in the district and canton of Grevenmacher in the southwestern side of the Grand Duchy of Luxembourg. In 2005, the population is 208. The bottom part of ...

, known in Luxembourgish as ''On'' *

Ontario Ontario ( ; ) is one of the thirteen provinces and territories of Canada.Ontario is located in the geographic eastern half of Canada, but it has historically and politically been considered to be part of Central Canada. Located in Central C ...

, a Canadian province

Science, technology, and mathematics

Biology and medicine

Operative note An Operative report is a report written in a patient's medical record to document the details of a surgery. The operative report is dictated right after a surgical procedure and later transcribed into the patient's record. The information in the ope ...

, documentation of care relating to an operation *

Optic neuritis Optic neuritis describes any condition that causes inflammation of the optic nerve; it may be associated with demyelinating diseases, or infectious or inflammatory processes. It is also known as optic papillitis (when the head of the optic nerv ...

, especially relevant in multiple sclerosis *

Osteonecrosis Avascular necrosis (AVN), also called osteonecrosis or bone infarction, is death of bone tissue due to interruption of the blood supply. Early on, there may be no symptoms. Gradually joint pain may develop which may limit the ability to move. Co ...

, death of bone tissue *

Osteonectin Osteonectin (ON) also known as secreted protein acidic and rich in cysteine (SPARC) or basement-membrane protein 40 (BM-40) is a protein that in humans is encoded by the ''SPARC'' gene. Osteonectin is a glycoprotein in the bone that binds calciu ...

, a glycoprotein

Other uses in science, technology, and mathematics

ON Semiconductor onsemi (stylized in lowercase; legally ON Semiconductor Corporation; formerly ON Semiconductor until August 5, 2021) is an American semiconductor supplier company, based in Phoenix, Arizona and ranked #483 on the 2022 ''Fortune'' 500 based on it ...

, a semiconductor manufacturing company * O'Nan group, a mathematical group * OS/Net, the OpenSolaris Community * On, the proper class of all ordinal numbers

Other uses

* On (biblical figure), son of Peleth * On (company), a Swiss athletic shoe and sportswear company * On Kawara, Japanese artist * Nauru Airlines (IATA airline designator ON) * Leg side, in the game of cricket * Old Norse, a North Germanic language commonly referenced in etymology * Ontology, a branch of philosophy that deals with the concept of being * On'yomi, reading of Japanese kanji characters * Order of the Nation, a Jamaican honour * Overground Network, a railway scheme in South London * ON convoys, a series of WWII trade convoys * Orka náttúrunnar (ON Power), Icelandic geothermal power company