| Abbreviation | Definition |
|---|---|
| FIM | Friendship Is Magic (My Little Pony / Hasbro) |
| FIM | Fuel Injected Motorcycle |
| FIM | Full Indicator Movement |
| FIMT | Fiber In Metal Tube |
| FIO | Flow Injection Operations |
| FITG | Fill In The Gap |
| FITK | FIberglass Test Kit |
| FITP | Fire Instructor Training Products |
| FITV | Fast Idle Thermal Valve |
| FIWW | Free Internet Window Washer |
| FJ | From Japan |
| FJC | Fullband Junction Circulator |
| FL | Formula Libre |
| FL | Formula Lightning |
| FLCN | Floating Locking Clinch Nut |
| FLG | Flange |
| FLGR | Full Length Guide Rod |
| FLOWBEARS | Florida Flower Bears |
| FLPCC | Fiber-Loaded Precipitated Calcium Carbonate (paper production) |
| FLT | Fork Lift Truck |