OSL may refer to:

Science and technology

• Open Shading Language, a shading language

• Open Software License, an open-source software license

• Optically stimulated luminescence, a method of measuring doses from ionizing radiation, which is often used in mineral dating

• Open syllable lengthening, a process by which short vowels become long in open syllables

Groups, organizations, companies

• OSL Group, Hong Kong-based brokerage and digital-assets manager

• 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

• Oud-Strijders Legioen, a Dutch right-wing organization (1952–2010)

• Sosoliso Airlines, ICAO airline designator

Events

• Ongamenet Starleague, a tournament for professional StarCraft players in South Korea

• Outside Lands, a music and arts festival that takes place annually in San Francsico's Golden Gate Park

Other uses

• Oslo Airport, Gardermoen, IATA airport code

• Osl, a Hungarian gens originating in the 12th century

See also

• OSI (disambiguation)