| folie | foolishness |
| folie des grandeurs | megalomania |
| Folie à deux | Folie à deux |
| Folies Bergère | Folies Bergère |
| Foligno | Foligno |
| folio | folio |
| Folium de Descartes | Folium of Descartes |
| folk | folk music |
| Folk metal | Folk metal |
| Folke Bernadotte | Count Folke Bernadotte of Wisborg |
| Folkestone | Folkestone |
| Folketing | Folketing |
| folklore | folklore |
| Folklore français | French mythology |
| folklorique | folkloric |
| Folksonomie | Folksonomy |
| Folkspraak | Folkspraak |
| Folkung | Folkung |
| Folkwang-Hochschule | Folkwang Academy |
| Folkways | Folkways Records |
| Folland Gnat | Folland Gnat |
| folle | mad |
| Folle avoine | Avena fatua |
| folle de la gâchette | trigger-happy |
| folle du volant | speedster |
| follement | madly |
| Folles | Folles |
| folliculaire | follicular |
| follicule | follicle |
| follicule pileux | hair follicle |
| folliculogénèse | folliculogenesis |
| Folquet de Marselha | Folquet de Marselha |
| Folsom | Folsom |
| folâtre | happy |
| folâtrement | friskily |
