| Acronym | Meaning |
 | FJ | Fiji (ISO 3166 Digram; FIPS 10-4 Country Code) |
| FJ | Fijian Language (ISO 639-1 Code) |
| FJD | Fiji Dollar (ISO 4217 Currency Code) |
| FJI | Fiji (ISO 3166 Trigram) |
| FK | Falkland Islands (ISO 3166 Digram; FIPS 10-4 Territory Code) |
| FK | Femtokelvin |
| FKP | Falkland Islands Pound (ISO 4217 Currency Code) |
| FKSM | Fort Knox Supplemental Manual |
| FL | Floruit (Latin |
| FL | Femtolitre |
| FL | Florida (postal Symbol) |
| FLA | Florida -Front Line Assembly - Future Large Aircraft |
| FLAC | Free Lossless Audio Codec. |
| FLAK | FLugAbwehrKanone (German For Anti-Aircraft Guns) |
| FLB | Forward Logistics Base |
| FLET | Forward Line Of Enemy Troops |
| FLIP | Flight Information Publication |
| FLIR | Forward Looking InfraRed (sensor) |
| FLK | Falkland Islands (ISO 3166 Trigram) -Funny-Looking Kid (medical Diagnosis In-joke) |
| FLOT | Forward Line Of Own Troops |
| FLQ | Front De Lib?ration Du Qu?bec (French For Qu?bec Liberation Front) |
| FLTSAT | Fleet Satellite |
| FLTSATCOM | Fleet Satellite Communication System |
| FLUBOS | Fat |
| FM | Federal Magistrate (Australian Post-nominal) -Federated States Of Micronesia (postal Symbol; ISO 3166 Digram; FIPS 10-4 Territory Code) -Field Manual - Flight Manager - Frequency Modulation (electronics) |
| FM | Femtometre |
| FM | Fermium |
| FMC | Federal Magistrates' Court (an Australian Federal Court |
| FMCA | Federal Magistrates' Court Of Australia (used For Citing Decisions Of The FMC Other Than Family Law Decisions) |
| FMCAFAM | Federal Magistrates' Court Of Australia: Family (used For Citing Family Law Decisions Of The FMC) |
| FME | Formal Methods Europe |
| FMECA | Failure Modes And Effect Criticality Analysis |
| FMRI | Functional Magnetic Resonance Imaging |
| FMS | Federal Magistrates Service (an Australian Federal Court |
| FMSF | False Memory Syndrome Foundation |
| FMTV | Family Of Medium Tactical Vehicles |
| FN | Femtonewton |
| FNA | Functional Needs Analysis |
| FO | Faroe Islands (ISO 3166 Digram; FIPS 10-4 Territory Code) -Force Operations (military) - Forward Observer - Frame Optional (military Symbology) |
| FO | Faroese Language (ISO 639-1 Code) |
| FOB | Free On Board (shipping) |
| FOB | Forward Operating Base |
| FOC | Full Operational Capability |
| FOE | Friends Of The Earth |
| FOGC | Federal Oil And Gas Council |
| FOH | Front Of House |
| FOIA | Freedom Of Information Act |
| FOM | Federation Object Model |
| FONSI | Finding Of No Significant Impact |
| FOO | Forward Observation Officer |
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