FI
- fi – (s) Finnish language (ISO 639-1 code)
- FI – (s) Finland (ISO 3166 digram; FIPS 10-4 country code)
- FIA – (a) Fédération internationale de l'automobile (French "International Automobile Federation")
- FIAT – (a) Fabbrica Italiana Automobili Torino (Italian "Italian Car Factory of Turin")
- FIB – (a) Fucking Illinois Bastard (Wisconsin slang, variants exist)
- FIBA – originally (a) Fédération internationale de basket-ball amateur (French, "International Amateur Basketball Federation"); since 1989, (p) Fédération internationale de basket-ball
- FIBUA – (i/a) Fighting In Built-Up Areas
- FIC – (i) Fellowship for Intentional Community
- FID – (i) Foreign Internal Defence
- FIDÉ – (a) Fédération internationale des échecs (French, "World Chess Federation")
- FIE – (i) Fly-In Echelon
- FIFA – (a) Fédération internationale de football association (French, "International Association Football Federation")
- FIFe – (a) Fédération internationale féline (French, "International Feline Federation")
- FIFO – (a) First In, First Out
- FIFRA – (a) Federal Insecticide, Fungicide, and Rodenticide Act
- FIG
- (i) Fédération internationale des géomètres (French, "International Federation of Surveyors")
- Fédération internationale de gymnastique (French, "International Federation of Gymnastics")
- Feminist Improvising Group (music ensemble)
- FIGJAM – (a) Fuck I'm Good, Just Ask Me
- fij – (s) Fijian language (ISO 639-2 code)
- FILA – (a) Fédération internationale des luttes associées (French, "International Federation of Associated Wrestling Styles")
- FILO – (a) First In, Last Out (see also LIFO)
- FIMPT – (i) Fellow of the Institute of Maxillofacial Prosthetists and Technologists
- fin – (s) Finnish language (ISO 639-2 code)
- FIN – (s) Finland (ISO 3166 trigram)
- FINA – (p/a) Fédération internationale de natation (French, "International Swimming Federation")
- FIPS – (a) Federal Information Processing Standard
- FIR
- (i) Final Inspection Report
- Federazione Italiana Rugby (Italian, "Italian Rugby (Union) Federation")
- FIS – (a/i) Fédération internationale de ski (French "International Ski Federation")
- FISA – (a) Fédération Internationale des Sociétés d'Aviron (French, "International Federation of Rowing Associations")
- FISH – (a) Fluorescence In-Situ Hybridisation
- FiST – (p) Fire Support Team
- FITS – (a) Flexible Image Transport System
- FIU – (i) Florida International University
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