- FAGAN, THOMAS WALLACE (1874 - 1951), agricultural chemist
- FARR, HARRY (1874 - 1968), librarian
- FARRINGTON, RICHARD (1702 - 1772), cleric and antiquary
- FELD, VALERIE ANNE (1947 - 2001), politician
- FENTON, RICHARD (1747 - 1821), poet and topographical writer
- FERRAR, ROBERT (d. 1555), Protestant martyr and bishop
- FFOWC BACH Y CANWR - see WILLIAMS, FOULK ROBERT
- FFRANCON-THOMAS, DAVID - see THOMAS, DAVID FFRANGCON
- FFRANGCON-DAVIES, GWEN LUCY (1891 - 1992), actress
- FFRANGCON-THOMAS, DAVID - see THOMAS, DAVID FFRANGCON
- FICER PRICHARD - see PRICHARD, RHYS
- FIELD, THEOPHILUS (1574 - 1636), bishop
- FINCH, Voelas - see WYNNE
- FINCH, HAROLD JOSIAH (1898 - 1979), Labour politician
- FINCH, Sir WILLIAM HENEAGE WYNNE - see WYNNE-FINCH, Sir WILLIAM HENEAGE
- FINIAN (fl. 6th century), saint
- FISHER, FRANCIS GEORGE (1909 - 1970), dramatist and producer
- FISHER, JOHN (1862 - 1930), Welsh scholar
- FISON, ANNA (Morfydd Eryri; 1839 - 1920), linguist, poet and educator
- FITT, MARY - see FREEMAN, KATHLEEN
- FITZ ALAN family, lords of Oswestry and Clun, and later earls of Arundel
- FITZ WARIN family, lords Whittington, Alderbury, Alveston
- FITZGERALD, DAVID (d. 1176), bishop of S. Davids
- FITZGERALD, MAURICE (d. 1176), one of the conquerors of Ireland
- FITZGERALD, MICHAEL CORNELIUS JOHN (1927 - 2007), a friar of the Carmelite Order, priest, philosopher and poet
- FITZOSBERN, WILLIAM (d. 1071), earl of Hereford, lord of Breteuil in Normandy
- FITZSTEPHEN, ROBERT (d. c. 1183), one of the conquerors of Ireland
- FLEETWOOD, WILLIAM (1656 - 1723), bishop and antiquary
- FLEURE, HERBERT JOHN (1877 - 1969), geographer
- FLOOD, EDWARD - see LLOYD, EDWARD
- FLOUD, EDWARD - see LLOYD, EDWARD
- FLOWERS, BRIAN HILTON (Lord Flowers), (1924 - 2010), scientist and university administrator
- FLOWERS, Lord - see FLOWERS, BRIAN HILTON
- FLOYD, EDWARD - see LLOYD, EDWARD
- FLOYD, JOHN - see LLOYD, JOHN
- FLUDD, EDWARD - see LLOYD, EDWARD
- FLUDD, GEORGE - see LLOYD, GEORGE
- FLYNN, PATRICIA MAUD (Patti) (1937 - 2020), musician, author, activist
- FOLEY, Sir THOMAS (1757 - 1833), admiral
- FOLLAND, HENRY (1878 - 1926), industrialist
- FOOT, MICHAEL MACKINTOSH (1913 - 2010), politician, journalist, author
- FOSTER, IDRIS LLEWELYN (1911 - 1984), Welsh and Celtic Scholar
- FOSTER, IVOR LLEWELYN (1870 - 1959), singer
- FOTHERGILL family, iron-masters
- FOULKES, ISABELLE JANE ('Issi') (1970 - 2001), deaf artist, designer and campaigner
- FOULKES, ANNIE (1877 - 1962), editor of an anthology
- FOULKES, HENRY POWELL (1815 - 1886), cleric and author
- FOULKES, HUMPHREY (1673 - 1737), cleric and antiquary
- FOULKES, ISAAC (Llyfrbryf; 1836 - 1904), newspaper proprietor and publisher
- FOULKES, PETER (1676 - 1747), scholar and divine