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
 - Fluid-structure interaction
 - Frequency scanning interferometry
 - 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
 
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 Sales promotion § Consumer sales promotion types
 
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