- 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)