FSI

FSI may refer to:

Economics

 * Financial services industry
 * Financial Secrecy Index, a ranking of secrecy jurisdictions
 * Financial Stability Institute, a body of the Bank for International Settlements

Government and politics

 * Federation of Italian Socialists (Italian: Federazione dei Socialisti Italiani), a defunct political party of Italy
 * Foreign Service Institute, of the United States government
 * Foreign Service Institute, India, an agency of the Indian government
 * Forest Survey of India
 * Fragile States Index, a country ranking method
 * Internal Security Forces (French: Forces de Sécurité Intérieure), the national security force of Lebanon

Technology

 * First strong isolate, a Unicode character used to support Bidirectional text
 * Flame spread index, a material's propensity to burn
 * Fluid-structure interaction, in fluid dynamics
 * Frequency scanning interferometry, a technique for measuring the distance between two points
 * FRISK Software International, an Icelandic antivirus software developer
 * FRU Support Interface, a simple bus for low-level access to IBM Power-based hardware
 * FSI International, an American equipment manufacturer
 * Fuel stratified injection
 * Full spectral imaging, in spectroscopy

Other uses

 * Fédération Ivoirienne du Scoutisme, the Ivorian Scouting Federation
 * Ferrovie dello Stato Italiane, the Italian state-owned railway company
 * FlightSafety International, an American aviation training provider
 * Floor space index
 * Florida Space Institute, of the State University System of Florida
 * FontShop International, a German type foundry
 * Fox Sports International
 * Freeman Spogli Institute for International Studies, at Stanford University
 * Free Sons of Israel, a fraternal organization
 * IATA code for Henry Post Army Airfield, in Fort Sill, Oklahoma, United States
 * Italian Chess Federation (Italian: Federazione Scacchistica Italiana)
 * Free-standing insert, a type of advertising: See