| Acronym | Meaning |
 | FAD | Flavin Adenine Dinucleotide |
| FADAC | Field Artillery Data Computer |
| FAH | Federation Of American Hospitals - Fine Arts And Humanities - Foreign Affairs Handbook |
| FAI | F?d?ration A?ronautique Internationale (French |
| FAM | Foreign Affairs Manual |
| FAO | Food And Agriculture Organization |
| FAO | Faroese Language (ISO 639-2 Code) |
| FAQ | Frequently Asked Questions (sometimes Pronounced Fak) |
| FARC | Fuerzas Armadas Revolucionarias De Colombia (Spanish |
| FARP | Forward Arming And Refuelling Point / Forward Area Rearm/refuel Point |
| FAS | Federation Of American Scientists - Fetal Alcohol Syndrome |
| FAS | Persian Language (ISO 639-2 Code) |
| FASCAM | Field Artillery Scatterable Mines |
| FASD | Fetal Alcohol Spectrum Disorder |
| FASEB | Federation Of American Societies For Experimental Biology |
| FAT | Field Artillery Tractor - File Allocation Table |
| FAVS | Future Armoured Vehicle System |
| FBCB2 OR FBCB? | Force XXI Battle Command |
| FBCS | Fellow Of The British Computer Society |
| FBI | Federal Bureau Of Investigation |
| FBIDST | Fellow Of The British Institute Of Dental And Surgical Technologists |
| FBIS | Foreign Broadcast Information Service |
| FBR | Fast Breeder Reactor - Foundation For Biomedical Research |
| FC | Fire Control -Funnel Cloud (METAR Code) |
| FC | Femtocoulomb |
| FCA | Fraction Of Combat Active Forces |
| FCC | U.S. Federal Communications Commission |
| FCE | First Certificate In English |
| FCM | Federation Of Canadian Municipalities - Fogarty's Cove Music |
| FCO | UK Foreign And Commonwealth Office |
| FCS | Future Combat System |
| FCW | Florida Championship Wrestling |
| FCZ | Forward Combat Zone |
| FDA | Food And Drug Administration (U.S.) |
| FDC | Federal Detention Center (U.S.) - Fire Direction Centre |
| FDDI | Fibre Distributed Data Interface |
| FDR | Flight Data Recorder - Franklin Delano Roosevelt |
| FE | Fully Exposed (armoured Vehicle Target |
| FE | Iron (Latin Ferrum) |
| FEAR | First Encounter Assault Recon - False Evidence Appears Real |
| FEAST | Forum For European-Australian Science And Technology Cooperation |
| FEBA | Forward Edge Of The Battle Area |
| FEC. | Fecit (Latin |
| FED | Field Emission Display |
| FEDEP | Federation Development Process (Simulation) |
| FEF | Frontal Eye Field (neurophysiology) |
| FEMA | U.S. Federal Emergency Management Agency |
| FENS | Federation Of European Neuroscience Societies |
| FEP | Firepower Enhancement Program - Fleet Satellite (FLTSAT) Extremely High Frequency (EHF) Package |
| FES | Flywheel Energy Storage |
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