- FIDP(Foreign Internal Defense Plan)
- FIE(Fly-In Echelon)
- FIESTA(Fun, Innovation, Enthusiasm, Spirit, Teamwork, and Attitude)
- FIF(Field In Filename)
- FIFA(Fédération internationale de football association (French, "International Association Football Federation"))
- FIFe(Fédération internationale féline (French, "International Feline Federation"))
- FIFI(Faith In the Family International)
- FIFO(First In, First Out)
- FIFRA(Federal Insecticide, Fungicide, and Rodenticide Act)
- FIFV(Future Infantry Fighting Vehicle (US))
- FIG(Fédération internationale des géomètres (French, "International Federation of Surveyors"))
- FIGA(Federacion Iberica de Grupos Anarquistas)
- FIGB(Fort Island Gulf Beach)
- FIGC(Federazione Italiana Giuoco Calcio)
- FIGD(Flow Injection / Gas Diffusion)
- FIGE(Field Inversion Gel Electrophoresis)
- FIGHT(Fighting Inefficient Government and High Taxes)
- FIGJAM(Fuck I'm Good, Just Ask Me)
- FIGMO(Fuck it I Got My Orders)
- FIGN(Forces d?Intervention de la Gendarmerie Nationale)
- FIGO(International Federation of Gynecology and Obstetrics)
