- DAI'R CANTWR - see DAVIES, DAVID
- DAIMOND, ROBERT (BOB) BRIAN (1946 - 2020), civil engineer and historian
- DALTON, Baron - see DALTON, EDWARD HUGH JOHN NEALE
- DALTON, EDWARD HUGH JOHN NEALE (BARON DALTON), (1887 - 1962), economist and politician
- DANIEL (d. 1127), archdeacon - see SULIEN
- DANIEL ap LLOSGWRN MEW, poet
- DANIEL DDU o GEREDIGION - see EVANS, DANIEL
- DANIEL, DAVID ROBERT (1859 - 1931), publicist
- DANIEL, EVAN (1837 - 1904), cleric and educationist
- DANIEL, GWYNFRYN MORGAN (1904 - 1960), educationalist and language campaigner
- DANIEL, JOHN (1755? - 1823), printer
- DANIEL, JOHN EDWARD (1902 - 1962), college lecturer and inspector of schools
- DANIEL, WILLIAM RAYMOND (1928 - 1997), association football player
- DANIELS, ELEANOR (1886 - 1994), actress
- DARLINGTON, THOMAS (1864 - 1908), scholar and inspector of schools
- DASS, SHOSHI MUKHI (1868 - 1921), missionary, teacher and nurse
- DAULBIN, Segrwyd - see DOLBEN
- DAVID (d. 1139?), bishop of Bangor
- DAVID ab OWEN (d. 1512), abbot and bishop
- DAVID ap DAVID LLOYD - see DAFYDD ap DAFYDD LLWYD
- DAVID ap GRUFFYDD - see DAFYDD ap GRUFFYDD
- DAVID ap HOELL ap IEUAN ap IORWERTH cleric - see , DAFYDD TREFOR, Sir
- DEWI Saint , founder and abbot-bishop of S. Davids, and patron saint of Wales
- DAVID, JOB (1746 - 1812), General Baptist minister
- DAVID, JOB (1709 - 1766), pastor - see DAVID, JOB
- DAVID, JOHN (1701? - 1756), Independent minister
- DAVID, PHILIP (1709 - 1787) Penmain, Independent minister
- DAVID, REES (fl. 1746), early Arminian Baptist
- DAVID, Sir TANNATT WILLIAM EDGEWORTH (1858 - 1934), geologist and explorer
- DAVID, THOMAS - see DAFYDD, THOMAS
- DAVID, THOMAS ESSILE - see DAVIES, THOMAS ESSILE
- DAVIDS, THOMAS WILLIAM (1816 - 1884), Independent minister and ecclesiastical historian
- DAVIDS, THOMAS WILLIAM RHYS (1843 - 1922), professor of comparative religion - see DAVIDS, THOMAS WILLIAM
- DAVIES family, smiths
- DAVIES, Dôl-goch - see DAVIES, JOHN
- DAVIES, Llannerch Gwysaney - see DAVIES COOKE
- DAVIES, , industrialists - see DAVIS
- DAVIES of Llandinam, 1st Baron - see DAVIES, DAVID
- DAVIES, ALUN TALFAN (1913 - 2000), barrister, judge, politician, publisher and businessman
- DAVIES, Syr ROGER (fl. c. 1500), cleric and poet
- DAVIES, Sir ALFRED THOMAS (1861 - 1949), the first Permanent Secretary (1907-25) of the Welsh Department of the Board of Education
- DAVIES, ALUN (1916 - 1980), historian
- DAVIES, ALUN HERBERT (CREUNANT) (1927 - 2005), the first director of the Welsh Books Council
- DAVIES, ALUN WYNNE GRIFFITHS (1924 - 1988), musician and critic
- DAVIES, ANEIRIN TALFAN (1909 - 1980), poet, literary critic, broadcaster and publisher
- DAVIES, ANNIE (1910 - 1970), radio and television producer
- DAVIES, BEN (1864 - 1937), Independent minister, and poet
- DAVIES, BEN (1840 - 1930), Independent minister, popular preacher, and author
- DAVIES, BEN (1878 - 1958), Independent minister
- DAVIES, BENJAMIN (1739? - 1817), Independent academy tutor