FSI

• FRISK Software International
• FRU Support Interface
• FSI International
• Federation of Italian Socialists
• Ferrovie dello Stato Italiane
• Financial Secrecy Index
• Financial Stability Institute
• Flame spread index
• FlightSafety International
• Floor space index
• Florida Space Institute
• Fluid-structure interaction
• FontShop International
• Foreign Service Institute
• Foreign Service Institute, India
• Forest Survey of India
• Fox Sports International
• Fragile States Index
• Free Sons of Israel
• Freeman Spogli Institute for International Studies
• Frequency scanning interferometry
• Fuel stratified injection
• Full spectral imaging
• Fédération Ivoirienne du Scoutisme
• Henry Post Army Airfield
• IBM POWER microprocessors
• Internal Security Forces
• Italian Chess Federation