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OSL may refer to:


  • Open Software License, an open-source software license


  • Open Shading Language, a shading language
  • Optically stimulated luminescence, a method of measuring doses from ionizing radiation, which is often used in mineral dating
  • OSU Open Source Lab, the open-source research facility at Oregon State University


  • Ongamenet Starleague, a tournament for professional StarCraft players in South Korea
  • Ontario Soccer League, a semi-pro soccer league in Ontario, Canada
  • Orchestra of St. Luke's, chamber orchestra in Manhattan, New York City
  • Order of Saint Luke, a Methodist religious order
  • Oregon Short Line Railroad, a former railroad in the U.S. states of Wyoming, Idaho, Utah, Montana and Oregon
  • Oslo Airport, Gardermoen, IATA airport code
  • Oud-Strijders Legioen, a Dutch right-wing organization (1952–2010)
  • Sosoliso Airlines, ICAO airline designator
Osl (genus)

Osl (Osli, Osth or Ozsol) was the name of a gens (Latin for "clan"; nemzetség in Hungarian) with Pecheneg or Hungarian origin in the Kingdom of Hungary, based in today's Győr-Moson-Sopron County. The village of Osli was named after that clan.