| Flumenthal | Flumenthal |
| Fluminense Football Club | Fluminense Football Club |
| flummox | atontar |
| flummoxed | desconcertado |
| Flunitrazepam | Rohypnol |
| flunk | suspender |
| flunkey | pelotillero |
| fluorapatite | fluorapatita |
| fluoresce | ser fluorescente |
| fluorescence | fluorescencia |
| Fluorescence microscope | Microscopio de fluorescencia |
| fluorescent | fluorescente |
| Fluorescent in situ hybridization | Fluorescencia in situ hibridación |
| fluorescent light | luz de neón |
| fluorescent lighting | iluminación de neón |
| Fluorescent Multilayer Disc | Fluorescent Multilayer Disc |
| fluoridate | fluorizar |
| fluoridation | fluoración |
| fluoride | fluoruro |
| fluorine | flúor |
| fluorite | fluorita |
| fluoroscope | fluoroscopio |
| Fluospar | Fluorita |
| fluoxetine | fluoxetina |
| Flurbereinigung | Concentración parcelaria |
| flurry | soplada |
| flush | ruborizarse |
| Flush board | Halza |
| flush toilet | inodoro |
| Flush with | A ras de |
| Flushed Away | Flushed Away |
| flushing | limpiar con un chorro de agua |
| fluster | poner nervioso |
| flute | flauta |
| fluted | acanalado |
| flutist | flautista |
| flutter | agitar |
| fluttering | aleteo |
| fluvial | fluvial |
| fluvial resource | recursos fluviales |
| flux | fundir |
| Fluxbox | Fluxbox |
| fluxion | fluir |
| fluxional | terso |
| Fluxus | Fluxus |
| Fluyt | Filibote |
| Fluíde dynamics | Mecánica de fluidos |
| fly | conducir |
| fly about | revolotear |
| fly across | volar sobre |
| fly agaric | matamoscas |
| fly ash | cenizas volantes |
| fly away | irse volando |
| Fly Away Home | Volando libre |
| fly by | pasar volando |
| fly by night | rondador |
| Fly For Fun | Flyff |
| fly off | desprenderse |
| fly off the handle | perder los estribos |
| fly over | volar sobre |
| Fly River | Las Aventuras de Fly |
| Fly-ball | Candela |
| fly-by | acercamiento |
| fly-by-night | noctámbulo |
| fly-half | medio de apertura |
| flyaway | suelto |
| flyblown | lleno de cresas |
| flyby | acercamiento |
| flycatcher | papamoscas |
| flyer | folleto |
| flying | volante |
| flying buttress | arbotante |
| Flying car | Automóvil volador |
| Flying Down to Rio | Carioca |
| Flying Dutchman | Holandés Volador |
| flying fish | pez volador |
| flying fox | murciélago frugívoro |
| Flying in a Blue Dream | Flying in a Blue Dream |
| flying saucer | OVNI |
| Flying shuttle | Lanzadera volante |
| Flying Spaghetti Monster | Monstruo de Espagueti Volador |
| flying squad | escuadra ligera |
| Flying Steamer Duck | Tachyeres patachonicus |
| Flying Tigers | Tigres Voladores |
| FlyLal | FlyLAL |
| flyleaf | guarda |
| Flynn effect | Efecto Flynn |
| flyover | acercamiento |
| flypaper | papel matamoscas |
| flypast | desfile aéreo |
| Flysch | Flysch |
| Flystar | Astraeus |
| flyswatter | matamoscas |
| flyweight | peso mosca |
| Flyweight pattern | Flyweight |
| flywheel | volante |
| Flywheel energy storage | Batería inercial |
| Flávio Amado | Flávio Amado |
| Flávio Saretta | Flávio Saretta |
| Fläche | Área |
| Fläsch | Fläsch |
| Flèche Wallonne | Flecha Valona |
| Flórián Albert | Flórián Albert |
