| Acronym | Definition |
|---|
| FL | Florida (US postal abbreviation) |
| FL | Fort Lewis (Washington) |
| FL | Flat |
| FL | Filter |
| FL | First Lady |
| FL | French Lick (Indiana) |
| FL | Flash (nautical navigation) |
| FL | Finish Line |
| FL | Foreign Language |
| FL | Flight Line |
| FL | Fluid |
| FL | Fast Lane |
| FL | Front Line |
| FL | Forward Looking |
| FL | Flute |
| FL | Fruityloops (audio software) |
| FL | Flight Level |
| FL | Flawless (diamonds) |
| FL | Focal Length |
| FL | Flensburg (German city) |
| FL | Fire Lake (Bob Seger Song) |
| FL | Florin (coin) |
| FL | Facilities List |
| FL | Fork Length (fish measurement) |
| FL | Freelancer (computer game) |
| FL | Fuzzy Logic |
| FL | Flashing Light |
| FL | Airtran (ICAO code) |
| FL | Fluorine |
| FL | Fuerstentum Liechtenstein |
| FL | File List |
| FL | Field Level (STARS Standard Accounting and Reporting System) |
| FL | Fanlisting |
| FL | Flanker (football position) |
| FL | Fluid Level |
| FL | Flammable Liquid |
| FL | Fluorescence Microscopy |
| FL | Franz Liszt (classical composer) |
| FL | Floruit (Latin: Flourished) |
| FL | Flowline |
| FL | Financial Leverage |
| FL | Femur Length |
| FL | Forced Landing |
| FL | Fault Location |
| FL | Freie Liste (German: Free List, Liechtenstein) |
| FL | Fiber-Optic Link |
| FL | Face Left |
| Fl | Flintholm (Danish railway station) |
| FL | Fire Lord (video game) |
| FL | Format Line |
| FL | Fail Last |
| FL | Foot-Lambert (luminance unit) |
| fL | Femtoliter (10E-15 liter) |
| FL | Frylock (cartoon character) |
| FL | Floor Levelness (concrete construction) |
| FL | Farben Lehre (Polish punk-rock band) |
| FL | French Lop (breed of rabbit) |
| FL | Flexible Link |
| FL | Flagship Lounge (American Airlines first class lounge) |
| FL | Functional Location |
| FL | Failed Link |
| FL | Folded Letter |
| FL | Fuller Lodge (Los Alamos, NM) |
| FL | Foreign Lady |
| FL | Functional Library |
| FL | Flanker Back (football; old position) |
| FL | Free Leech |
| FL | Faceoffs Lost (hockey) |
| FL | Fachlehrkraft (German schools) |
| FL | Floor Lieutenant |
| FL | Flexileave (UK) |
| FL | Federal Libertarian |
| Fl | Lighting correction factor |
| FL | Full Load |
| FL | Force Level |
| FL | Frito-Lay |
| FL | Fort Lauderdale (Florida) |
| FL | Freightliner (truck manufacturer) |
| FL | Friedmann-Lemaître Metric (an exact solution of Einstein's field theory of relativity) |
| FL | Foot Locker |
| FL | Foot Loose |