FSI

FSI is a three-letter abbreviation with multiple meanings, including:
*Foreign Service Institute India in New Delhi, India, the Institute for training of Indian Foreign Service Officers
* Failed States Index, A country ranking method
* Federazione Scacchistica Italiana, the Italian Chess Federation
* FlightSafety International, an aviation training provider
* Floor Space Index, the ratio of total floor space to plot size
* Fluid-structure interaction, a phenomenon that occurs when a fluid interacts with a solid structure
* Foreign Service Institute, the primary training facility for American Foreign Service Officers
* Freeman Spogli Institute for International Studies, Stanford University's primary forum for interdisciplinary research on key international issues and challenges.
* Frequency Scanning Interferometry, an interferometric method of distance measurement
* FRISK Software International, an Icelandic antivirus software developers
* Fuel Stratified Injection, a type of gasoline engine made by Volkswagen
* Floor Space Index, quotient of the ratio of a combined gross floor area.
* FireSide Innocence, a band out of Lincoln Nebraska consisting of Alternative Rock songs.
* Food, seed, and industrial products.
* Financial Service Institution