OS, O.S., Os, O's, or os may refer to:

Computing

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Medicine

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People

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Places

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Norway

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  • Os, Innlandet, a municipality in Innlandet county, Norway
  • Os, Hordaland, a former municipality in Hordaland county, Norway
  • Os, Østfold, a parish in Rakkestad municipality in Østfold county, Norway
  • Os Church, a name for several churches in Norway

Poland

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  • Oś, Kluczbork County, a village in Kluczbork County, Opole Voivodeship, Poland
  • Osiedle (Os.), a Polish term used for housing subdivisions in Poland

Germany

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  • Opavian Silesia or "Upper Silesia", a portion of Silesia in the German Empire that opted to remain in Germany's Weimar Republic and Nazi Germany until World War II. After the War, it was divided between Czechoslovakia and Poland.

Other places

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  • Os, Värnamo, a village in Värnamo Municipality, Småland province, Sweden
  • OS, ICAO code for airports in Syria
  • OS, WMO country code for Austria

Religion

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  • Ōs, an Old English word denoting a god in Anglo-Saxon paganism, related to æsir
  • O.S., Order of Santiago, a Spanish order dedicated to St James the Greater
  • O.S., Order of Sikatuna, the national order of diplomatic merit of the Philippines

Science

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Businesses

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Entertainment

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Sport

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Titles

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Other uses

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  • Esker, also os, a long, winding ridge of sand and gravel in (formerly) glaciated regions
  • Ōs (rune) (ᚩ), a rune of the Anglo-Saxon fuþorc
  • Old Style (O.S.) date, indicating use of an earlier calendar (in Anglophone countries, the Julian Calendar), as opposed to "N.S." (new style), usually indicating use of the Gregorian Calendar
  • Ossetic language (ISO 639-1 abbreviation OS)
  • Object sexuality, sexual attraction to inanimate objects
  • Oral sex

See also

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