- BERRY, WILLIAM EWERT (1879 - 1954), newspaper proprietor - see BERRY
- BERTIL, PRINCESS LILIAN (DUCHESS OF HALLAND), (1915 - 2013)
- BERW - see WILLIAMS, ROBERT ARTHUR
- BERWYN, RICHARD JONES (1837 - 1917), colonist and man of letters
- BEUNO (d. 642?), patron saint
- BEVAN, ANEURIN (1897 - 1960), politician and one of the founders of the Welfare State
- BEVAN, BRIDGET (Madam Bevan; 1698 - 1779), philanthropist and educationist
- BEVAN, EDWARD LATHAM (1861 - 1934), bishop - see BEVAN, WILLIAM LATHAM
- BEVAN, EVAN (1803 - 1866), poet
- BEVAN, HOPKIN (1765 - 1839), Calvinistic Methodist minister
- BEVAN, JOSEPH GURNEY (1753 - 1814), chemist - see BEVAN, SILVANUS
- BEVAN, LLEWELYN DAVID (1842 - 1918), Independent minister
- BEVAN, LLYWELYN (1661 - 1723), Independent minister
- BEVAN, PERCY VAUGHAN (1876 - 1913), professor of physics - see BEVAN, LLEWELYN DAVID
- BEVAN, SILVANUS (1691 - 1765), Quaker physician
- BEVAN, THOMAS (Caradawc, Caradawc y Fenni; 1802 - 1882), antiquary
- BEVAN, THOMAS (1796? - 1819), missionary in the service of the London Missionary Society
- BEVAN, TIMOTHY, chemist - see BEVAN, SILVANUS
- BEVAN, WILLIAM LATHAM (1821 - 1908), archdeacon
- BEYNON, BILL - see BEYNON, WILLIAM
- BEYNON, ROBERT (1881 - 1953), minister (Presb.), poet and essayist
- BEYNON, ROSSER (Asaph Glan Tâf; 1811 - 1876), musician
- BEYNON, THOMAS (d. 1729), minister
- BEYNON, THOMAS (1744 - 1835), archdeacon of Cardigan and patron of eisteddfodau and Welsh literature
- BEYNON, TOM (1886 - 1961), minister (Presb.), historian and author
- BEYNON, WILLIAM (1891 - 1932), former British bantam-weight champion
- BEYNON, Sir WILLIAM JOHN GRANVILLE (1914 - 1996), Professor of Physics involved in an international study of the ionosphere
- BIANCHI, ANTHONY (Tony) (1952 - 2017), writer
- BIDWELL, MORRIS, Puritan preacher, under the Commonwealth
- BIGGS, NORMAN (1870 - 1908), Wales and Cardiff Rugby wing threequarter
- BIRCH, EVELYN NIGEL CHETWODE (Baron Rhyl of Holywell), (1906 - 1981), Conservative politician
- BIRCH, JAMES (d. 1795?), watchmaker and sectary
- BIRCHINSHAW, MAURICE (d. 1564), rector - see BIRCHINSHAW, WILLIAM
- BIRCHINSHAW, WILLIAM (fl. 1584-1617), poet
- BIRD, JOHN (1768 - 1829), landscape painter
- BIRD, JOHN (d. 1840) - see THOMAS, RHYS
- BLACKMORE, ANNE BASSETT (1794 - 1825) - see KNIGHT, HENRY HEY
- BLACKWELL, HENRY (1851 - 1928), bookbinder and bookseller, bibliographer and biographer
- BLACKWELL, JOHN (Alun; 1797 - 1840), cleric and poet
- BLAGDON, LAURA EMILY (1822 - 1883), evangelist - see THOMAS, NATHANIEL
- BLAKE, LOIS (1890 - 1974), historian and promoter of Welsh folk dancing
- BLAYNEY family Gregynog,
- BLAYNEY, ARTHUR, violinist - see BLAYNEY, THOMAS
- BLAYNEY, EVAN (fl. c. 1406) - see BLAYNEY
- BLAYNEY, THOMAS (1785), harpist
- BLEDDYN - see JONES, WILLIAM
- BLEDDYN ap CYNFYN (d. 1075), prince
- BLEDDYN DDU (fl. c. 1200), poet
- BLEDDYN FARDD (fl. 1268-1283), one of the bards of the independent Welsh princes
- BLEDRI (d. 1022), bishop of Llandaff