OSI

OSI may refer to:

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

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