- AB ITHEL - see WILLIAMS, JOHN
- ABADAM, ALICE (1856 - 1940), campaigner for women's rights
- ABDUL-HAMID, SHEIKH (1900 - 1944), architect and Muslim leader
- ABEL, JOHN (1770 - 1819), Welsh Independent minister
- ABEL, SIÔN (fl. 18th century), Montgomeryshire ballad-writer
- ABERDARE, 1st Baron - see BRUCE, HENRY AUSTIN
- ABERDARE, 4th Baron - see BRUCE, MORYS GEORGE LYNDHURST
- ABERDARE, Lord - see BRUCE, HENRY AUSTIN
- ABLETT, NOAH (1883 - 1935), miner and Trade Union leader
- ABRAHAM (d. 1080), bishop of S. Davids
- ABRAHAM (d. 1232), bishop of St Asaph
- ABRAHAM, RICHARD (fl. 1673-1700), poet
- ABRAHAM, WILLIAM (Mabon; 1842 - 1922), M.P. and first president of the South Wales Miners' Federation
- ABRAM, RICHARD - see ABRAHAM, RICHARD
- ACHYDD GLAN TRODDI - see BRADNEY, Sir JOSEPH ALFRED
- ADAM (d. 1181), bishop of St Asaph
- ADAM OF USK (Adam Usk; 1352? - 1430), lawyer
- ADAM USK - see ADAM OF USK
- ADAMS, DAVID (1845 - 1922), Congregationalist divine
- ADAMS, ELIZABETH, printer - see ADAMS, ROGER
- ADAMS, ROGER (d. 1741), bookseller and printer at Chester
- ADAMS, WILLIAM (1813 - 1886), mining expert
- ADARE, Baron - see WYNDHAM-QUIN, WINDHAM HENRY
- ADDA FRAS (1240? - 1320?), poet and writer of prophecies
- ADDA JONES - see EVANS, JOHN
- ADFYFR - see HUGHES, THOMAS JOHN
- AELHAEARN (fl. 7th century), patron saint
- AFAN (fl. early 6th century), patron saint
- AFAN - see THOMAS, DAVID JOHN
- AFANWYSON - see MORGAN, THOMAS
- AIDAN (fl. 6th century), saint
- AIDUS Saint - see AIDAN, Saint
- AL-HAKIMI, ABDULLAH ALI (c. 1900 - 1954), Muslim leader
- ALAFON - see OWEN, OWEN GRIFFITH
- ALAW AFAN - see EVANS, WILLIAM
- ALAW DDU - see REES, WILLIAM THOMAS
- ALAW ELWY - see ROBERTS, JOHN
- ALAW GOCH - see WILLIAMS, DAVID
- ALAW RHONDDA - see LEWIS, JOSEPH RHYS
- ALAWYDD - see ROBERTS, DAVID
- ALAWYDD GLAN TÂF - see BRYANT, JOHN
- ALAWYDD Y DE - see WILLIAMS, ZEPHANIAH
- ALBAN DAVIES, DAVID (1873 - 1951), business man and philanthropist
- ALBAN DAVIES, JENKIN (1901 - 1968), business man and philanthropist
- ALBAN, Sir FREDERICK JOHN (1882 - 1965), chartered accountant and administrator
- ALEN, RHISIART ap RHISIART, author of 'Carol ymddiddan ag un marw ynghylch Purdan'
- ALFARDD - see HUGHES, JOHN JAMES
- ALICE verch Griffith ap Ieuan ap Llywelyn Fychan (fl. 1540-1570), a poetess
- ALIS WEN - see ALIS FERCH GRUFFUDD AB IEUAN AP LLYWELYN FYCHAN
- ALLCHURCH, IVOR JOHN (1929 - 1997), footballer