- BRANSBY, JAMES HEWES (1783 - 1847), schoolmaster - see WINTER, CHARLES
- BRAOSE family
- BRAUSE, - see BRAOSE
- BRAZELL, DAVID (1875 - 1959), singer
- BRECON, 1st Baron - see LEWIS, DAVID VIVIAN PENROSE
- BREECE, EVAN - see BREEZE, EVAN
- BREES, EVAN - see BREEZE, EVAN
- BREESE, CHARLES EDWARD (1867 - 1932), solicitor - see BREESE, EDWARD
- BREESE, EDWARD (1835 - 1881), antiquary
- BREESE, JOHN (1789 - 1842), Independent minister
- BREEZE, EVAN (1798 - 1855), poet
- BREEZE, SAMUEL (1772 - 1812), Baptist minister
- BREOS, - see BRAOSE
- BRERETON, ANDREW (or HENRY) JONES (Andreas o Fôn; 1827 - 1885), writer
- BRERETON, HENRY JONES - see BRERETON, ANDREW JONES
- BRERETON, JANE (1685 - 1740), poetess
- BRERETON, OWEN SALUSBURY (1715 - 1798), antiquary
- BREWER, JEHOIADA (1752? - 1817), Independent minister and hymn-writer
- BREWES, - see BRAOSE
- BRIDGEMAN, GEORGE THOMAS ORLANDO (1823 - 1895), cleric, antiquary and genealogist
- BRIGSTOCKE, THOMAS (1809 - 1881), portrait painter
- BRIOC (fl. 6th century), saint
- BRIOG - see BRIOC
- BRIOUSE, - see BRAOSE
- BRISCOE, THOMAS (1813 - 1895), cleric and scholar
- BRITHDIR - see WILLIAMS, HUGH DOUGLAS
- BROCHWEL YSGITHROG - see BROCHWEL YSGYTHROG
- BROCHWEL YSGYTHROG (fl. 550), prince
- BROMFIELD, MATHEW (fl. 1520-60), poet - see BRWMFFILD, MATHEW
- BROMLEY, HUMPHREY (1796), Unitarian preacher
- BROMWICH, RACHEL SHELDON (1915 - 2010), scholar
- BROOKE, Dame BARBARA MURIEL (Baroness Brooke of Ystradfellte), (1908 - 2000), politician
- BROOKE, Baroness - see BROOKE, Dame BARBARA MURIEL
- BROOKES, BEATA ANN (1930 - 2015), politician
- BROSTER family, printers Bangor
- BROTHER DAVID - see HUGHES, WILLIAM JOHN
- BROUGHTON family Marchwiel,
- BROWN, AMOS WILLIAM (1860 - 1956), collier and sportsman
- BROWN, CHARLES (fl. 1789-1790) - see BROUGHTON
- BROWN, JAMES CONWAY (1838 - 1908), musician
- BROWN, JOHN (d. 1847), printer - see BROSTER
- BROWN, MIA ARNESBY (1867 - 1931), artist
- BROWNE, CHARLES (1582 - 1647), Jesuit missionary - see BODVEL
- BROWNE, FELICIA DOROTHEA - see HEMANS, FELICIA DOROTHEA
- BRUCE, CHARLES GRANVILLE (1866 - 1939), mountaineer and soldier
- BRUCE, HENRY AUSTIN (1815 - 1895), 1st baron Aberdare
- BRUCE, MORYS GEORGE LYNDHURST (4th Baron Aberdare), (1919 - 2005), politician and sportsman
- BRUCE, WILLIAM NAPIER (1858 - 1936), educationalist and lawyer
- BRUNT, Sir DAVID (1886 - 1965), meteorologist and vice-president of the Royal Society
- BRUTUS - see OWEN, DAVID