FFI may refer to:
Entertainment
- Festival Film Indonesia, in Indonesian annual Film Festival
- Final Fantasy (video game), or Final Fantasy I, 1987 video game
- Final Fight (video game), 1989 fighting action video game
Organizations
- Family Firm Institute
- Fauna and Flora International, a conservation group
- Fellow of the Flag Institute
- Film Federation of India
- Finlay Forest Industries, a defunct Canadian forest products company
- Franciscan Friars of the Immaculate, a Roman Catholic institute of religious life
- Frederikshavn fI, a Danish sport club
- Free File, Inc., an American consortium of tax preparation companies
- French Forces of the Interior (French: Forces Françaises de l'Intérieur), French resistance fighters during World War II
- Fuel Freedom International, an American multi-level marketing company
- Norwegian Defence Research Establishment (Norwegian: Forsvarets forskningsinstitutt), a Norwegian military R&D institute
Science and technology
- Fatal insomnia, an extremely rare neurological disorder that leads to chronic insomnia and inevitable death
- Foreign function interface, in computing
Other uses
- ffi, a typographical ligature
- Foia Foia language, spoken in Papua New Guinea
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