| Flag of Palestine | Flag of Pennsylvania | Flag of South Carolina |
| Flag of Switzerland | Flag of Syria | Flag of the African Union |
| Flag of the Principality of Sealand | FLAG-tag | Flagellation |
| Flagellum | Flagler, Colorado | Flags |
| Flags of the World | FLAGS register | Flagship |
| Flam | Flambeau, Price County, Wisconsin | Flambeau, Rusk County, Wisconsin |
| Flame | Flame (malware) | Flame Nebula |
| Flame test | Flame Towers | Flamethrower |
| Flammability | Flammulina velutipes | Flamsteed designation |
| Flamurtari Vlorë | Flanagan, Illinois | Flandreau, South Dakota |
| Flange | Flank | Flank gland |
| Flanvotumab | Flap | Flap endonuclease |
| Flappy Bird | Flaps | Flare |
| Flare (countermeasure) | Flare (phone) | Flare gun |
| Flare star | Flash (comics) | Flash (photography) |
| Flash Airlines Flight 604 | Flash evaporation | Flash memory |
| Flash Memory | Flash mob | Flash point |
| Flash prose | Flash Video | Flashback (narrative) |
| Flashdance | Flasher, North Dakota | FlashForward |
| FlashFXP | Flashlight | FlashNotes |
| Flat (music) | Flat feet | Flat glass |
| Flat organization | Flat panel display | Flat Rock, Henderson County, North Carolina |
| Flat Rock, Illinois | Flat Rock, Michigan | Flat tax |
| Flatberg | Flatbergium sericeum | Flatbread |
| Flatfish | Flatland | Flatness (systems theory) |
| Flatonia, Texas | Flattening | Flatulence |
| Flatwoods, Kentucky | Flatwoods, West Virginia | Flavia Pennetta |
| Flavin adenine dinucleotide | Flavin mononucleotide | Flavio Cipolla |
| Flavio Roma | Flaviviridae | Flavivirus |
| Flavobacteria | Flavobacteriaceae | Flavobacteriales |
| Flavobacteriia | Flavones | Flavonoid |
| Flavored milk | Flavour (particle physics) | Flax |
| Flaxton, North Dakota | Flaxville, Montana | Flaying |
| Flávio Amado | Flávio Saretta | Fläschenspitz |
| Fléchin | Flórián Albert | Flüela Schwarzhorn |
| Flüela Wisshorn | Flügel | Flea |
| Flecainide | Fleckistock | Fleet Satellite Communications System |
| Fleischmanns, New York | Fleming's left-hand rule for motors | Fleming's right hand rule |
| Fleming, Colorado | Fleming, New York | Fleming-Neon, Kentucky |
| Flemingsburg, Kentucky | Flemington, Georgia | Flemington, Missouri |
| Flemington, West Virginia | Flemish Community | Flemming Povlsen |
| Flensburg Government | Flensburg, Minnesota | Flerovium |
| Flers, Pas-de-Calais | Fletcher, North Carolina | Fletcher, Ohio |
| Fletcher, Oklahoma | Fletcher, Vermont | Fletschhorn |
| Fleur-de-lis | Fleurbaix | Fleury Di Nallo |
| Fleury, Pas-de-Calais | Flevoland | Flexbourg |
| Flexible manufacturing system | Flexiviridae | Flexor carpi radialis muscle |
| Flexor carpi ulnaris muscle | Flexor digiti minimi brevis muscle (hand) | Flexor digitorum profundus muscle |
| Flexor digitorum superficialis muscle | Flexor pollicis brevis muscle | Flexor pollicis longus muscle |
| FlexRay | Flextime | FLG-AS1 |
| Flibanserin | FLiBe | Flickr |
| Flickr.com | Flicky | Flight (2012 film) |
| Flight 19 | Flight and expulsion of Germans (1944–50) | Flight attendant |
| Flight control surfaces | Flight dynamics (fixed-wing aircraft) | Flight engineer |
| Flight feather | Flight instrument | Flight International |
| Flight recorder | Flight simulator | Flight suit |
| Flight test | FlightGlobal | Flightglobal |
| Flightglobal.com | Flightplan | Flikken Maastricht |
| Flimspitz | Flinders Petrie | Flint |
| Flint Township, Michigan | Flint, Michigan | Flip-flop (electronics) |
| Flip-flops | Flipped classroom | Flippin, Arkansas |
| Flirtation Walk | Flirting | FLN football team |
| Floater | Floating Bridge, Dubai | Floating point |
| Floating point unit | Floating ribs | Floating-point unit |
| Floatplane | Flocculation | Flock |
| Flock (birds) | Flock (web browser) | Flomoxef |
| Flood | Flood basalt | Flood control |
| Flood control in the Netherlands | Flood fill | Flood myth |
| Floodplain restoration | Floodwood, Minnesota | Floor |
| Floor (gymnastics) | Floor and ceiling functions | Floor area (building) |
| Floor plan | Floor plate | Floppy disk |
| FLOPS | Flora of Azerbaijan | Flora of China |
| Flora, Illinois | Flora, Indiana | Flora, Mississippi |
| Floral design | Floral Genome Project | Floral Magician Mary Bell |
| Floral Park, New York | Florence | Florence (town), Wisconsin |
| Florence Arthaud | Florence Chadwick | Florence County, Wisconsin |
| Florence Delay | Florence Devouard | Florence flask |
| Florence Griffith Joyner | Florence Nightingale | Florence Nightingale effect |
| Florence Township, Michigan | Florence Welch | Florence, Arizona |
| Florence, Colorado | Florence, Illinois | Florence, Kansas |
| Florence, Kentucky | Florence, Minnesota | Florence, Mississippi |
| Florence, New York | Florence, South Carolina | Florence, South Dakota |
| Florence, Texas | Florencia Peña | Florencio Sánchez |
| Florent Balmont | Florent Laville | Florent Malouda |
| Florent Marty | Florent Piétrus | Florent Pietrus |
| Florent Rouamba | Florent Serra | Florent Sinama Pongolle |
| Florentin Petre | Florentin Pogba | Florentin Smarandache |
| Floresville, Texas | Florian Bague | Florian Fromlowitz |
| Florian Heller | Florian Klein | Florian Koch |
| Florian Kringe | Florian Marange | Florian Maurice |
| Florian Mayer | Florian Meyer | Florian Pittiș |
| Floriano Peixoto | Floriculture | Florida |
| Florida Championship Wrestling | Florida Film Festival | Florida Institute of Technology |
| Florida, Massachusetts | Florida, Missouri | Florida, Montgomery County, New York |
| Florida, Ohio | Florin Gheorghiu | Florin Piersic |
| Florin Prunea | Florin Răducioiu | Florinda Bolkan |
| Floringhem | Floris, Iowa | Flossmoor, Illinois |
| Flour | Flour treatment agent | Flous |
| Flovilla, Georgia | FLOW | Flow control (data) |
| Flow cytometry | Flow karyotyping | Flow sensor |
