OSI

OSI is primarily used as an abbreviation and has many meanings:

General

• 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
• Objective Systems Integrators, a company that provides monitoring software for communication networks
• Olomouc Summer Institute, an educational program for high-school students
• Open Space Institute, an organization that seeks to preserve scenic, natural and historic landscapes
• Open Society Institute, a private charitable foundation established by George Soros to promote open societies around the world
• Ordnance Survey Ireland (Suirbhéireacht Ordanáis Éireann)
• Otto-Suhr-Institut, the political-science institute of the Free University of Berlin
• Options Symbology Initiative, a plan to change the way that exchange-traded options are named
• Open Systems International, an automation software vendor for the electric, petroleum, transportation and water industries
• Open Systems Interconnection, ISO 7498, International Organization for Standardization
• Osijek Airport, an airport in Croatia

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 short-lived former American government agency created in 2001, part of the Department of Defense and focused on psychological warfare
• Office of Special Investigations, 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 (Republic of Korea), a secret intelligence unit of Republic of Korea Air Force

Finance

• OSI, acronym for Official Sector Involvement in sovereign debt restructuring deals, as opposed to PSI, Private Sector Involvement.

Technology

• Open Systems Interconnection, 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
• Open Source Initiative, an organization dedicated to promoting open source software
• Ohio Scientific Inc., a microcomputer manufacturer from the late 1970s to the early 1980s
• Open Switching Interval, a type of disconnect supervision
• On-Site Inspection, an advanced measure technique combining several methods - especially used in order to detect nuclear tests
• Officine Stampaggi Industriali, Italian coachbuilder

Entertainment

• OSI (band), an American progressive rock supergroup named after the former Office of Strategic Influence government agency
• Origin Systems, a former United States computer game developer
• Office of Strategic Influence (album), the 2003 debut album by the band OSI

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 Umenyiora, defensive end for the New York Giants