On, on, or ON may refer to:

Arts and entertainment

Music

On (band) On, stylized as ON, was a solo project of American musician, Ken Andrews, which he started after the breakup of his previous band, Failure (band), Failure in 1997. The music of On was not unlike that of Failure in terms of Songwriter, songwriting, ...

, 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'' * "On", a song by Anson Lo, 2023

Other media

* '' Ön'', a 1966 Swedish film * On (Japanese prosody), the counting of sound units in Japanese poetry * ''On'' (novel), by Adam Roberts * ONdigital, a failed British digital television service, later called ITV Digital *

Overmyer Network The United Network (commonly referred to as United; known prior to launch as the Overmyer Network or ON) was an attempt at a fourth television network in the United States that operated through the month of May 1967. Founded by Daniel H. Ove ...

, a former US television network

Places

On (Ancient Egypt) Heliopolis (Jwnw, Iunu; , 'the Pillars'; , ; ) was a major city of ancient Egypt. It was the capital of the 13th or Heliopolite Nome of Lower Egypt and a major religious centre. Its site is within the boundaries of Ain Shams and El Matareya, ...

, 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") is a city and municipality of Wallonia located in the Belgian province of Luxembourg. The municipality consists of the following districts: Aye, Hargimont, Humain, Marche-en-Famenne, ...

* Ahn, Luxembourg, known in Luxembourgish as ''On'' *

Ontario Ontario is the southernmost Provinces and territories of Canada, province of Canada. Located in Central Canada, Ontario is the Population of Canada by province and territory, country's most populous province. As of the 2021 Canadian census, it ...

, a Canadian province

Science, technology, and mathematics

Biology and medicineca

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 operative report incl ...

, documentation of care relating to an operation *

Optic neuritis Optic neuritis (ON) is a debilitating condition that is defined as inflammation of cranial nerve II which results in disruption of the neurologic pathways that allow visual sensory information received by the retina to be able to be transmitted to ...

, 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 person's abili ...

, death of bone tissue * P

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 calci ...

, a glycoprotein

Other uses in science, technology, and mathematics

ON Semiconductor ON Semiconductor Corporation (stylized and doing business as onsemi) is an American semiconductor supplier company, based in Scottsdale, Arizona. Products include power and signal management, logic, discrete, and custom devices for automotive, c ...

, a semiconductor manufacturing company *

O'Nan group In the area of abstract algebra known as group theory, the O'Nan group ''O'N'' or O'Nan–Sims group is a sporadic simple group of order : 460,815,505,920 = 2934573111931 ≈ 5. History ''O'N'' is one of the 26 sporadic group ...

, a mathematical group * OS/Net, the

OpenSolaris OpenSolaris () is a discontinued open-source computer operating system for SPARC and x86 based systems, created by Sun Microsystems and based on Solaris. Its development began in the mid 2000s and ended in 2010. OpenSolaris was developed as ...

Community * On, the

proper class Proper may refer to: Mathematics * Proper map, in topology, a property of continuous function between topological spaces, if inverse images of compact subsets are compact * Proper morphism, in algebraic geometry, an analogue of a proper map f ...

of all

ordinal numbers In set theory, an ordinal number, or ordinal, is a generalization of ordinal numerals (first, second, th, etc.) aimed to extend enumeration to infinite sets. A finite set can be enumerated by successively labeling each element with the leas ...

Other uses

* On, Egyptian name of Heliopolis * On (biblical figure), son of Peleth *

On (company) On Holding AG is a Swiss athletic shoe and performance sportswear company that designs and markets sports clothing and running shoes. In 2019, the company held 40% of the running shoe market in Switzerland and 10% in Germany. As of 2020, On pr ...

, a Swiss athletic shoe and sportswear company *

On Kawara was a Japanese conceptual artist who lived in SoHo, New York City, from 1965 until his death. He took part in many solo and group Art exhibition, exhibitions, including the Venice Biennale in 1976. Early life Kawara was born in Kariya, Japan on ...

, Japanese artist * Nauru Airlines (IATA airline designator ON) *

Old Norse Old Norse, also referred to as Old Nordic or Old Scandinavian, was a stage of development of North Germanic languages, North Germanic dialects before their final divergence into separate Nordic languages. Old Norse was spoken by inhabitants ...

, a North Germanic language commonly referenced in etymology *

Ontology Ontology is the philosophical study of existence, being. It is traditionally understood as the subdiscipline of metaphysics focused on the most general features of reality. As one of the most fundamental concepts, being encompasses all of realit ...

, a branch of philosophy that deals with the concept of being *

On'yomi , or the Sino-Japanese vocabulary, Sino-Japanese reading, is the reading of a kanji based on the historical Chinese pronunciation of the character. A single kanji might have multiple ''on'yomi'' pronunciations, reflecting the Chinese pronuncia ...

, reading of Japanese kanji characters * Order of the Nation, a Jamaican honour *

Overground Network Overground Network (abbreviated on or ON) was a branding initiative launched in 2003 by the Strategic Rail Authority (SRA) and Transport for London (TfL), the public transport authority in London, England. Its aim was to encourage use of Natio ...

, a railway scheme in South London * ON convoys, a series of WWII trade convoys * Orka náttúrunnar (ON Power), Icelandic geothermal power company * , a Basque-language honorific equivalent to Spanish * On, a

preposition Adpositions are a part of speech, class of words used to express spatial or temporal relations (''in, under, towards, behind, ago'', etc.) or mark various thematic relations, semantic roles (''of, for''). The most common adpositions are prepositi ...

* On, one of the

French personal pronouns French personal pronouns (analogous to English English personal pronouns, ''I'', ''you'', ''he/she'', ''we'', ''they'', etc.) reflect the grammatical person, person and grammatical number, number of their referent, and in the case of the third pe ...