| Acronym | Meaning |
 | FET | Field-Effect Transistor |
| FEZ | Fighter Engagement Zone |
| FF | Final Fantasy |
| FF | Femtofarad |
| FF | Fula Language (ISO 639-1 Code) |
| FFA | Forum Fisheries Agency -Free-Fire Area - Fusiform Face Area - Football Federation Australia - Future Farmers Of America (today The National FFA Organization) |
| FFC | Free For Chat |
| FFE | Fukuoka Futures Exchange |
| FFF | F?d?ration Fran?aise De Football (French |
| FFG | Guided Missile Frigate (hull Classification Symbol) |
| FFOV | Forward Field Of View |
| FFR | Fédération Française De Rugby (French Rugby Federation) |
| FFS | For Fuck's Sake |
| FFT | Fast Fourier Transform - Final Fantasy Tactics |
| FG | Femtogram |
| FG | Fog (METAR Code) - French Guiana (FIPS 10-4 Territory Code) |
| FH | Femtohenry |
| FHFIF | Foster's Home For Imaginary Friends |
| FHI | Family Health International |
| FI | Finland (ISO 3166 Digram; FIPS 10-4 Country Code) |
| FI | Finnish Language (ISO 639-1 Code) |
| FIA | F?d?ration Internationale De L'automobile (French International Automobile Federation) |
| FIAT | Fabbrica Italiana Automobili Torino (Italian Italian Car Factory Of Turin) |
| FIB | Fucking Illinois Bastard (Wisconsin Slang |
| FIBA | F?d?ration Internationale De Basketball Amateur (French |
| FIBUA | Fighting In Built-Up Areas |
| FIC | Fellowship For Intentional Community |
| FID | Foreign Internal Defence |
| FID | F?d?ration Internationale Des ?checs (French World Chess Federation) |
| FIE | Fly-In Echelon |
| FIFA | F?d?ration Internationale De Football Association (French International Association Football Federation) |
| FIFE | F?d?ration Internationale F?line (French International Feline Federation) |
| FIFO | First In |
| FIFRA | Federal Insecticide |
| FIGJAM | Fuck I'm Good |
| FIJ | Fijian Language (ISO 639-2 Code) |
| FILO | First In |
| FIMPT | Fellow Of The Institute Of Maxillofacial Prosthetists And Technologists |
| FIN | Finland (ISO 3166 Trigram) |
| FIN | Finnish Language (ISO 639-2 Code) |
| FINA | F?d?ration Internationale De Natation (French |
| FIPS | Federal Information Processing Standard |
| FIR | Final Inspection Report |
| FIS | F?d?ration Internationale De Ski (French International Ski Federation) |
| FISA | F?d?ration Internationale Des Soci?t?s D'Aviron (French |
| FISH | Fluorescence In-Situ Hybridisation |
| FIST | Fire Support Team |
| FITS | Flexible Image Transport System |
| FIU | Florida International University |
| FJ | Femtojoule |
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