- FIAV (Fundacion Internacional de Atun de Vara de Baja California)
- FIB (Fucking Illinois Bastard (Wisconsin slang, variants exist))
- FIBA (originally Fédération internationale de basket-ball amateur (French, "International Amateur Basketball Federation"); since 1989, Fédération internationale de basket-ball)
- FIBS (First Internet Backgammon Server)
- FIBUA (Fighting In Built-Up Areas)
- FIC (Fellowship for Intentional Community)
- FICA (Fur Information Council of America)
- FICAH (Food Industry Crusade Against Hunger)
- FICE (Fédération des Communités Educatives)
- FICON (FIber CONnectivity)
- FICS (Free Internet Chess Server)
- FID (Foreign Internal Defenses)
- FIDAF (Foreign Internal Defense Augmentation Force)
- FIDÉ (Fédération internationale des échecs (French, "World Chess Federation"))
- FIDE (Fuzzy Inference Development Environment)
- FIDL (FAAD ( Forward Area Air Defense) Instrument Data Link)
- FIDM (Fashion Institute of Design & Merchandising)
- FIDO (Film Industry Defence Organisation)
- 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"))