| finta | pretense |
| finura | refinement |
| Finwë | Finwë |
| finés | Finnish |
| finísimo | wafer-thin |
| Fiodor Lynen | Fiodor Felix Konrad Lynen |
| Fiodor Stravinski | Fyodor Stravinsky |
| Fionia | Funen |
| Fionn Mac Cumhaill | Fionn mac Cumhaill |
| fiordo | fjord |
| Fiordo de Clyde | Firth of Clyde |
| Fiordo de Forth | Firth of Forth |
| Fiordo de Solway | Solway Firth |
| Fiordo de Tay | Firth of Tay |
| Fiore | Sailor Moon R movie |
| Fiorenzo Stolfi | Fiorenzo Stolfi |
| FIR | Finite impulse response |
| Fir Bolg | Fir Bolg |
| Fire | Fire |
| Firestone | Firestone Tire and Rubber Company |
| firewall | firewall |
| FireWire | firewire |
| firma | firm |
| Firma digital ciega | Blind signature |
| firmamento | sky |
| firmante | signatory |
| firmar | sign |
| firmar conjuntamente | cosign |
| firmar el registro | register |
| Firmar un acuerdo | To sign an agreement |
| firme | audacious |
| firme de carretera | roadbed |
| firmemente | decisively |
| firmeza | persistence |
| Firmo II | Firmus |
| Firmus Piett | Admiral Piett |
| Firmware | Firmware |
| First Certificate in English | First Certificate in English |
| First comics | First Comics |
| First day of my life | First Day of My Life |
| First Folio | First Folio |
| First Impressions of Earth | First Impressions of Earth |
| FIRST Lego League | FIRST Lego League |
| First Minister | Prime Minister |
| First Nations | First Nations |
| Firuzabad | Firouzabad |
| FIS | FIS |
| fiscal | lawyer |
| fiscal del Tribunal Supremo | attorney general |
| Fiscal General de los Estados Unidos | United States Attorney General |
| Fiscalidad | Taxation |
| fiscalía | public prosecutor's office |
| Fischbachau | Fischbachau |
| Fischer | Fischer |
| Fischland-Darß-Zingst | Fischland-Darß-Zingst |
| fisco | exchequer |
| Fiscus | Treasury |
| fisgar | pry |
| fisgonear | pry |
