- BARRINGTON, DAINES (1727/1728 - 1800), lawyer, antiquary, and naturalist
- BARRINGTON, SHUTE, bishop of Llandaff - see BARRINGTON, DAINES
- BARSTOW, Sir GEORGE LEWIS (1874 - 1966), civil servant, president of University College Swansea
- BARTI DDU - see ROBERTS, BARTHOLOMEW
- BARTRUM, PETER CLEMENT (1907 - 2008), scholar of Welsh genealogy
- BASSETT, CHRISTOPHER (1753 - 1784), Methodist cleric
- BASSETT, ELIAS, solicitor - see BASSETT, RICHARD
- BASSETT, HULDAH CHARLES (1901 - 1982), teacher, musician and broadcaster
- BASSETT, RICHARD (1777 - 1852), Methodist cleric
- BATCHELOR, JOHN (1820 - 1883), businessman and politician
- BATTRICK, GERALD (1947 - 1998), tennis player
- BAUGH, ROBERT (1748? - 1832), engraver, map-maker, and musician
- BAXTER, GEORGE ROBERT WYTHEN (1815 - 1854), author
- BAXTER, WILLIAM (1650 - 1723), antiquary
- BAYLY, HENRY (1744 - 1812) - see PAGET
- BAYLY, LEWIS (d. 1631), bishop and devotional writer
- BAYLY, THOMAS (1608 - 1657) - see BAYLY, LEWIS
- BEADLES, ELISHA (1670 - 1734), Quaker and writer
- BEALE, ANNE (1816 - 1900), writer
- BEAU NASH - see NASH, RICHARD
- BEAUFORT, Dukes of - see SOMERSET
- BEAUMONT, JAMES (d. 1750), early C.M. exhorter
- BEAUMONT, Lieutenant-Colonel the Hon. RALPH EDWARD BLACKETT (1901 - 1977), Member of Parliament and public figure
- BEBB, LLEWELLYN JOHN MONTFORD (1862 - 1915), cleric
- BEBB, WILLIAM AMBROSE (1894 - 1955), historian, prose writer and politician
- BECK, THOMAS (d. 1293), bishop of S. Davids
- BEDLOE, WILLIAM (1650 - 1680), adventurer and Popish Plot informer
- BEDO AEDDREN (fl. c. 1500), bard
- BEDO BRWYNLLYS (c. 1460), a Brecknock poet
- BEDO HAFESP (fl. 1568-1585), poet of Montgomeryshire
- BEDO PHYLIP BACH (fl. 1480), poet of Brecknock
- BEFIS LLÊN, Syr - see BEFIS
- BEFIS, poet
- BEK, THOMAS - see BECK, THOMAS
- BELCHER, JOHN (fl. 1721-1763), Methodist exhorter
- BELI ap RHUN ap MAELGWN GWYNEDD - see RHUN ap MAELGWN GWYNEDD
- BELL, ERNEST DAVID (1915 - 1959), artist and poet
- BELL, Sir HAROLD IDRIS (1879 - 1967), scholar and translator
- BELL, RICHARD (1859 - 1930), M.P. and trade union leader
- BELL, RONALD MCMILLAN (1914 - 1982), Conservative politician
- BELLEROCHE, ALBERT de (1864 - 1944), painter and lithographer
- BELLIS, MARY EDITH - see NEPEAN, MARY EDITH
- BENNETT, NICHOLAS (1823 - 1899), musician and historian
- BENNETT, RICHARD (1860 - 1937), Calvinistic Methodist historian
- BERGAM, Y (fl. 14 c.), poet, vaticinator
- BERNARD (d. 1148), bishop of S. Davids
- BERRY family, industrialists and newspaper proprietors
- BERRY, JAMES GOMER - see BERRY
- BERRY, JOHN MATHIAS (1847 - 1917) - see BERRY
- BERRY, ROBERT GRIFFITH (1869 - 1945), minister (Congl.) and writer