OS

'Os' or 'OS' may refer to:

★ Os, Hedmark, a municipality in Norway

★ Os, Hordaland, a municipality in Norway

★ Os, Østfold, a parish in Norway.

★ Os penis, the bone in most mammals which makes the penis rigid

★ Oculum Sinister, Latin, "left eye"

★ Austria, from its World Meteorological Organization country code

★ Austrian Airlines, its IATA code

★ Ansuz rune, an Anglo-Saxon rune

★ External orifice of the uterus, the external os

★ Internal orifice of the uterus, the internal os

★ Ogawa Seiki, a Japanese manufacturer of model airplane engines

★ Olympic Games, an international multi-sport event taking place every four years

★ Open Seat, a tennis tournament in Barecelona, Spain

★ Open Source software

★ Operating system, the software that manages the hardware and software of a computer

★ Ordnance Survey the national mapping agency for Great Britain

★ Osmium, a chemical element

★ Ossetian language, from its ISO 639 alpha-2 code

★ Outlaw Star, a popular Japanese anime

★ Overseas

★ Off Screen; a formatting abbreviation in screenplays.

★ one of the Æsir

★ Old Style date, referring to the Julian Calendar; see Old Style and New Style dates

★ Old Stoic, a former pupil of Stowe School

★ Old Sedberghian, a former pupil of Sedbergh School

★ Old Shirburnian, a former pupil of Sherborne School