| Abbreviation | Definition |
|---|---|
| FIMV | Fatal Injury Multiple Vehicle |
| FIMVA | Fatal Injury Multiple Vehicle Accident |
| FINE-C | Fuel, Ignition, Neutral, Engine cut-off switch, Choke (motorcycling) |
| FINES | Fuel, Ignition, Neutral, Engine cut-off switch, Stand (motorcycling) |
| FIP | Freight Infrastructure Planning |
| FIR | Flight Information Region |
| FIRE | Functionally Integrated Railway Electronics |
| FISDO | Flight Inspection District Safety Office |
| FIT | Fit and Independent Traveler |
| FIT | Free and Independent Traveller |
| FIT | Free Independent Traveler |
| FIT | Frequent Independent Traveller |
| FITS | FAA (Federal Aviation Administration) Industry Training Standard |
| FIV | Future Infantry Vehicle |
| FL | Flight Level |
| FL | Full Load |
| FLASH | Fastest Legal All Street Harley |
| FLCH | Flight Level CHange |
| FLEET | Freight Logistics Environmental and Energy Tracking |
| FLHP | Federal Lands Highway Program |