FFU

FFU refer to:
 * Fan filter unit
 * Femur fibula ulna syndrome
 * Final Fantasy: Unlimited, an anime television series
 * Football Federation of Ukraine
 * Fred Flintstone Units, a pejorative term used to refer to United States customary units
 * Futaleufú Airfield, in Chile
 * Le Conquet radio or FFU (French Française Fixe de Ushant), a French radio station
 * Focus forming units, used to express Fluorescent Focus Assay in Virus quantification