{{Wiktionary|OSI}} '''OSI''' may refer to: {{TOC right}}
==Places== * Osijek Airport (IATA code: OSI), an airport in Croatia * Ősi, a village in Veszprém county, Hungary * Oši, an archaeological site in Semigallia, Latvia * Osi, a village in Ido-Osi, Ekiti State, Nigeria * Osi, Ekiti LGA.Kwara State, Nigeria
==Organizations== * Oblates of St. Joseph, a Roman Catholic Religious order that uses the postnominal initials O.S.I. * Open Source Initiative, an organization dedicated to promoting open source software * Open Society Institute, a private charitable foundation established by George Soros to promote open societies around the world * Open Society Institute-Baltimore, a locally based foundation that is part of Open Society Foundations * Open Space Institute, an organization that seeks to preserve scenic, natural and historic landscapes * Ordnance Survey International, a former subsidiary of the UK Ordnance Survey mapping agency * Ordnance Survey Ireland (''Suirbhéireacht Ordanáis Éireann'') * Otto-Suhr-Institut, the political-science institute of the Free University of Berlin
===Companies=== * OSI Group, an American holding company of meat processors that service the retail and food service industries * OSI Pharmaceuticals, an American pharmaceutical company * OSI Restaurant Partners, the restaurant and entertainment group that includes Outback Steakhouse * OSI Systems, a company that manufactures security scanners and medical equipment based in California * OSIsoft, a privately held company that develops device connectivity software * Objective Systems Integrators, a company that provides monitoring software for communication networks * Open Systems International, an automation software vendor for the electric, petroleum, transportation and water industries * Officine Stampaggi Industriali, a defunct Italian coachbuilder * Ohio Scientific Inc. (also known as Ohio Scientific Instruments), a US microcomputer manufacturer 1975–1981
===Government=== * Office of Scientific Intelligence, former name of a department of the Central Intelligence Agency now called the Directorate of Science and Technology * Office of Strategic Influence, a former American government agency, part of the Department of Defense and focused on psychological warfare * Office of Special Investigations (disambiguation), a name shared by several government agencies ** U.S. Air Force Office of Special Investigations ** Office of Special Investigations (Government Accountability Office) ** Office of Special Investigations (United States Department of Justice) * Office of Scientific Integrity, now United States Office of Research Integrity * Office of Special Investigation, a secret intelligence unit of Republic of Korea Air Force * Office of the Special Investigator Australia
==Technology== * Open Systems Interconnection, (ISO 7498) a joint ISO and ITU-T standard for computer networks and communication protocols ** OSI model, a layered description for communications and computer network protocol design ** OSI protocols * Open switching interval, a type of disconnect supervision in telecommunication * On-Site Inspection, an advanced measure technique combining several methods, especially used in order to detect nuclear tests
==Arts and entertainment== * OSI (band), an American progressive rock supergroup named after the former Office of Strategic Influence government agency ** ''Office of Strategic Influence'' (album), the 2003 debut album by the band OSI * Origin Systems, a former United States computer game developer * Orchestra della Svizzera Italiana, an orchestra in southern Switzerland in the city of Lugano which is in the canton of Ticino
===Fiction=== * Office of Scientific Intelligence a fictional United States government agency in several television programs and movies; * Office of Secret Intelligence, a fictional United States government secret agency in the animated series ''The Venture Bros.''
==People== * Osi (ancient tribe), an ancient tribe in Europe * Alans (ancient term Osi), an ancient tribe in the Caucasus * Osi Umenyiora (born 1981), former American football player * Osi Rhys Osmond (1942–2015), Welsh painter * Jean-Paul Appel, also known as Osi, leader of the UFO religion Siderella
==Other uses== * Order of the Star of Italy, an order of chivalry * Official sector involvement, in sovereign debt restructuring deals, as opposed to private sector involvement * Options Symbology Initiative, a plan to change the way that exchange-traded options are named in option symbol * Out-of-station interchange, a pedestrian change between two London Underground stations that allows continuity as part of one chargeable journey
==See also== * Osis (disambiguation)
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