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On Wikipedia, OS may refer to Oversight

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


  • OS, the IATA designator for Austrian Airlines (based on its original name: Österreichische Luftverkehrs AG)
  • O.S. Engines, a Japanese manufacturer of model aircraft engines
  • OutSystems, multinational software company which operates in the agile software development market


  • Open source, a software development model
  • Operating system, a software that manages the hardware and software of a computer
  • OS, referring to Mac OS, the operating system for Macintosh computers





  • Oś, Kluczbork County, a village in Kluczbork County, Opole Voivodeship, Poland
  • Os, Hedmark, a municipality in Hedmark county, Norway
  • Os, Hordaland, a municipality in Hordaland county, Norway
  • Os, Värnamo, a village in Värnamo Municipality, Småland province, Sweden
  • Os, Østfold, a parish in Rakkestad municipality in Østfold county, Norway
  • Os Church, a name for several churches in Norway
  • Os. or Osiedle, a Polish term used for housing subdivisions in Poland



  • Os TF, a sports club in Os, Norway
  • On-sight climbing, the ascent of a rock climbing route on the first attempt, with no falls, without prior knowledge of its specifics beyond its difficulty rating and number of protection points
  • O's, a nickname for the Baltimore Orioles, an American baseball team
  • O's, a nickname for the Leyton Orient, an English football (soccer) team


  • OS or Ordinary Seaman (occupation), an unlicensed member of the deck department of a merchant ship
  • OS or Ordnance Sergeant, an enlisted rank in the U.S. and Confederate armies during the American Civil War era
  • O.S. a notation standing for "Old Stonyhurst" used by alumni of the ancient Jesuit public school, Stonyhurst College


  • O.S. or "Old Style" date, indicating the old Julian Calendar, as opposed to "N.S." (new style) indicating the current Gregorian Calendar
  • OS, the ISO 639-1 abbreviation for the Ossetic language
  • OS, the ICAO code for airports in Syria
  • 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
  • Ōs, in Old English word denoting a god in Anglo-Saxon paganism, related to æsir
  • Ōs (rune) (ᚩ), a rune of the Anglo-Saxon fuþorc
  • OS, meaning Object sexuality which is the sexual attraction to inanimate objects
  • OS, a colloquialism for oral sex

See also[edit]