- JOHN WYN ap MAREDUDD (d. 1559), politician - see WYNN
- JOHN, AUGUSTUS EDWIN (1878 - 1961), artist
- JOHN, BRYNMOR THOMAS (1934 - 1988), Labour politician
- JOHN, DAVID (1782? - 1853), Unitarian minister, a Chartist, and, by trade, a smith
- JOHN, DAVID, Chartist - see JOHN, DAVID
- JOHN, EDWARD THOMAS (1857 - 1931), industrialist and politician
- JOHN, EWART STANLEY (1924 - 2007), theologian, Welsh Congregationalist minister, college professor and principal
- JOHN, GEORGE (1918 - 1994), minister (Bapt) and college principal
- JOHN, GRIFFITH (1831 - 1912), missionary
- JOHN, GWEN - see JOHN, GWENDOLEN MARY
- JOHN, GWENDOLEN MARY (1876 - 1939), artist
- JOHN, HENRY (1664 - 1754), hymnist
- JOHN, ISAAC (fl. 1729-1730), writer of halsingod
- JOHN, JAMES MANSEL (1910 - 1975), Baptist minster and college professor
- JOHN, MARY HANNAH (1874 - 1962), singer and revivalist
- JOHN, MATTHEW, Chartist - see JOHN, DAVID
- JOHN, THOMAS (1816 - 1862), Calvinistic Methodist minister
- JOHN, THOMAS GEORGE (1880 - 1946), engineer and businessman
- JOHN, WALTER PHILLIPS (1910 - 1967), minister (B)
- JOHN, Sir WILLIAM GOSCOMBE (1860 - 1952), sculptor and medallist
- JOHNES, ARTHUR JAMES (1809 - 1871), county court judge
- JOHNES, JOHN (1800 - 1876), barrister-at-law and county court judge
- JOHNES, RICHARD - see JONES, RICHARD
- JOHNES, THOMAS (1748 - 1816), landowner and man of letters
- JOHNS, Sir THOMAS - see JONES, 'Sir' THOMAS
- JOHNS, DAVID (fl. 1569-1586), cleric and poet
- JOHNS, DAVID (1796 - 1843), one of the London Missionary Society missionaries in Madagascar
- JOHNS, WILLIAM (1771 - 1845), Unitarian minister, tutor, and writer
- JOHNS, WILLIAM NICHOLAS (1834 - 1898), printer, antiquarian, newspaper proprietor, and editor
- JOHNSON, AUBREY RODWAY (1901 - 1985), university professor and Hebrew scholar
- JONES family Llwyn-rhys,
- JONES family, smiths, poets, musicians and preachers Cilie,
- JONES, Castellmarch - see JONES, Sir WILLIAM
- JONES, Syr THOMAS (d. 1622?), cleric and poet
- JONES, ABEL (Bardd Crwst; 1830 - 1901), ballad writer and strolling ballad singer
- JONES, ABRAHAM, printer - see JONES, RICHARD
- JONES, ALAN TREVOR (1901 - 1979), health service administrator and Provost, Welsh National School of Medicine
- JONES, ALFRED ERNEST (1879 - 1958), psychoanalyst and Sigmund Freud's official biographer
- JONES, Sir ALFRED LEWIS (1845 - 1909)
- JONES, ALICE GRAY (Ceridwen Peris; 1852 - 1943), author
- JONES, ALWYN RICE (1934 - 2007), Archbishop of Wales
- JONES, AMBROSE (d. 1678), bishop of Kildare - see JONES, MICHAEL
- JONES, ANEURIN (Aneurin Fardd; 1822 - 1904), man of letters
- JONES, ARTHUR (1776 - 1860), Independent minister
- JONES, ARTHUR (fl. 18th century), poet, of Llangadwaladr, Denbighshire, and sexton of Ruabon (where he died)
- JONES, ARTHUR LLEWELLIN - see MACHEN, ARTHUR
- JONES, AUDREY EVELYN (1929 - 2014), teacher and campaigner for women's rights
- JONES, BASSETT (fl. 1634-1659), scholar and physician
- JONES, BENJAMIN (1756 - 1823), Independent minister
- JONES, BENJAMIN (P[rif] A[rwyddfardd] Môn; 1788 - 1841), poet, writer, and Baptist apologete