On, on, or ON may refer to:
Language , a Basque-language honorific equivalent to Spanish On, a preposition On, one of the French personal pronouns
Arts and entertainment
Music On (band), 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 (Tasmin Archer 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 On-chan, a mascot of Hokkaido Television Broadcasting
Businesses and organizations Broadcasters ONdigital, a failed British digital television service, later called ITV Digital Ongehoord Nederland, a Dutch public broadcaster Overmyer Network, a former US television network
Other businesses and organizations On (company), a Swiss athletic shoe and sportswear company ON Semiconductor, a semiconductor manufacturing company Nauru Airlines (IATA airline designator ON) Ordine Nuovo, Italian fascist group Orka náttúrunnar (ON Power), Icelandic geothermal power company OS/Net, the OpenSolaris Community
Places On (Ancient Egypt), a Hebrew form of the ancient Egyptian name of Heliopolis On, Wallonia, a village now part of the municipality of Marche-en-Famenne Ahn, Luxembourg, known in Luxembourgish as On Ontario, a Canadian province On, Egyptian name of Heliopolis
Science, technology, and mathematics Biology and medicine Operative note, documentation of care relating to an operation Optic neuritis, especially relevant in multiple sclerosis Osteonecrosis, death of bone tissue Osteonectin, a glycoprotein
Other uses in science, technology, and mathematics O'Nan group, a mathematical group On, the proper class of all ordinal numbers
Other uses On (biblical figure), son of Peleth On Kawara, Japanese artist 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
See also O(n) Yōon