Ön

On, on, or ON may refer to:

• On (Japanese prosody), the counting of sound units in Japanese poetry
• Ön, a 1966 Swedish film
• On (novel), by Adam Roberts
• Air Nauru IATA airline designator ON
• On in Ancient Egypt, a Hebrew form of the ancient Egyptian name of Heliopolis
• ITV Digital, a failed British digital television service originally named ONdigital
• Leg side, in the game of cricket
• Old Norse, a North Germanic language commonly referenced in etymology
• ON Semiconductor, a semiconductor manufacturing company
• O'Nan group, a mathematical group
• Ontario, Canada
• Ontology, a branch of philosophy that deals with the concept of being
• On'yomi, reading of Japanese kanji characters
• Osteonectin, a glycoprotein
• Osteonecrosis
• Order of the Nation, a Jamaican honour
• Overground Network, a railway scheme in South London
• Overmyer Network, an ill-fated US television network
• OS/Net, the OpenSolaris Community
• Optic neuritis, especially relevant in multiple sclerosis
• On, the son of Pelath, participant in an Israelite rebellion against the leadership of Moses

Ön is a 1966 Swedish drama film directed by Alf Sjöberg. At the 3rd Guldbagge Awards Sjöberg won the award for Best Director. The film was also entered into the 1966 Cannes Film Festival.

Sørbøvågen is a village in Hyllestad Municipality in Sogn og Fjordane county, Norway. The village is located along the northern shore of the Hyllestadfjorden. It is located about northwest of the village of Hyllestad, the administrative centre of the municipality. The village of Hellevika (in Fjaler municipality) lies about to the north. Sørbøvågen is a small village, but it has a retirement/nursing home, a community hall, a billiards club, and it is the site of Øn Church which serves the northwestern third of the municipality.