| Acronym | Definition |
|---|
| FFU | For Future Use |
| FFU | Final Fantasy Unlimited (Anime) |
| FFU | Fit for Use |
| FFU | Filter Fan Unit (cleanliness) |
| FFU | Forschungsstelle für Umweltpolitik (Environmental Policy Research Unit, Free University of Berlin) |
| FFU | Fast File Undelete |
| FFU | Fan Filter Unit (cleanrooms) |
| FFU | Feriening Frysk Underwiis (German; Frisian education association; Netherlands) |
| FFU | Final Follow-Up (medical treatment) |
| FFU | Filthy Fingers United |
| FFU | Femur-Fibula-Ulna Syndrome |
| FFU | Fred Flintstone Units |
| FFU | Fédération Française d'Ultrasons (French: French Federation of Ultrasound) |
| FFU | Friendly Forward Unit (US Army) |
| FFU | Fluorescent Focus-Forming Unit |
| FFU | Fire Field Underwriter |
| FFU | Final Fantasy Union (gaming website) |
| FFU | Fight for United |