| fabuloso | awesome |
| Facade | Facade pattern |
| facciones | features |
| facción | faction |
| Facebook | Facebook |
| FACEL Vega | Facel Vega |
| Faces of Death | Faces of Death |
| faceta | facet |
| fachada | face |
| fachendoso | vainglorious |
| Fachhochschule | Fachhochschule |
| Fachhochschule Furtwangen | Furtwangen University of Applied Sciences |
| facial | facial |
| facil | easily |
| facilidad | ease |
| facilidades | dexterities |
| facilitar | ease |
| facistol | lectern |
| facoquero | warthog |
| facsímil | copy |
| facsímile | facsimile |
| factibilidad | workability |
| factible | accomplishable |
| facticio | artificial |
| factor | factor |
| factor abiótico | abiotic factor |
| Factor acéntrico | Acentric factor |
| factor biótico | biotic factor |
| factor de bioconcentración | bioconcentration factor |
| Factor de Boltzmann | Boltzmann factor |
| factor de emisión | emission factor |
| factor de forma | form factor |
| Factor de impacto | Impact factor |
| Factor de Lorentz | Lorentz factor |
| Factor de necrosis tumoral | Tumor necrosis factor-alpha |
| factor de producción | factor of production |
| Factor de relleno | Filling factor |
| factor de riesgo | risk factor |
| factor decisivo | determinant |
| factor disuasivo | disincentive |
| factor ecológico | ecological factor |
| Factor estimulante de colonias de granulocito y macrófagos | Granulocyte macrophage colony-stimulating factor |
| Factor G | G factor |
| factor geogénico | geogenic factor |
| factor productivo | factor of production |
| Factor Q | Q factor |
| factor RH | Rh factor |
| Factor X | The X Factor |
| Factor-X | X-Factor |
| Factorial | Factorial |
| Factorización de enteros | Integer factorization |
| Factorización LU | LU decomposition |
| Factory Method | Factory method pattern |
| factual | factual |
| factura | bill |
