- ROBERTS, RICHARD ARTHUR (1851 - 1943), archivist and editor
- ROBERTS, ROBERT (SILYN) (Rhosyr; 1871 - 1930), Calvinistic Methodist minister, poet, social reformer, tutor
- ROBERTS, ROBERT (1800 - 1878), schoolmaster and Calvinistic Methodist minister
- ROBERTS, ROBERT (1834 - 1885), cleric and scholar
- ROBERTS, ROBERT (1840 - 1871), musician
- ROBERTS, ROBERT (1777 - 1836), almanack-maker and printer
- ROBERTS, ROBERT (1762 - 1802), Calvinistic Methodist preacher
- ROBERTS, ROBERT (1774 - 1849), Calvinistic Methodist minister, and hymnist
- ROBERTS, ROBERT (1680 - 1741), cleric
- ROBERTS, ROBERT (Bob Tai'r Felin; 1870 - 1951), folk singer
- ROBERTS, ROBERT (1828 - 1916), business-man - see ROBERTS
- ROBERTS, ROBERT ALUN (1894 - 1969), Professor of Agricultural Botany at University College, Bangor, and a naturalist
- ROBERTS, ROBERT DAVID (1820 - 1893), Baptist minister
- ROBERTS, ROBERT DAVIES (1851 - 1911), pioneer in adult education and scientist
- ROBERTS, ROBERT ELLIS VAUGHAN (1888 - 1962), headmaster and naturalist
- ROBERTS, ROBERT GRIFFITH (1866 - 1930), Baptist minister, and writer
- ROBERTS, ROBERT HENRY (1838 - 1900), Baptist minister and principal of Regent's Park College, London
- ROBERTS, ROBERT MEIRION (1906 - 1967), minister (Presb. C. of Wales and Presb. C. of Scotland), philosopher and poet
- ROBERTS, SAMUEL (S.R.; 1800 - 1885), Independent minister, editor, Radical reformer
- ROBERTS, IEUAN WYN PRITCHARD (1930 - 2013), journalist and politician
- ROBERTS, THOMAS (1765-6 - 1841) Llwyn'rhudol, pamphleteer
- ROBERTS, THOMAS (Scorpion; 1816 - 1887), Independent minister
- ROBERTS, THOMAS (1835 - 1899), Calvinistic Methodist minister
- ROBERTS, THOMAS (d. c. 1775), first Baptist convert in Anglesey
- ROBERTS, THOMAS (1760 - 1811), printer
- ROBERTS, THOMAS (1735 - 1804), member of the 'Trevecka Family'
- ROBERTS, THOMAS (1884 - 1960), educationalist and scholar
- ROBERTS, THOMAS FRANCIS (1860 - 1919), principal, University College, Aberystwyth
- ROBERTS, THOMAS OSBORNE (1879 - 1948), musician
- ROBERTS, THOMAS ROWLAND (Asaph; 1857? - 1940), biographer
- ROBERTS, WILLIAM (Nefydd; 1813 - 1872), Baptist minister, printer, author, eisteddfodwr, South Wales representative of the British and Foreign Schools Society
- ROBERTS, WILLIAM (1585 - 1665), bishop of Bangor
- ROBERTS, WILLIAM (1784 - 1864), Calvinistic Methodist minister
- ROBERTS, WILLIAM (1809 - 1887), Calvinistic Methodist minister, editor, and author
- ROBERTS, WILLIAM (fl. 1745), poet and writer of interludes
- ROBERTS, WILLIAM (1828 - 1872), Congregational college tutor
- ROBERTS, WILLIAM (Gwilym Eryri; 1844 - 1895?), poet and editor
- ROBERTS, WILLIAM (fl. c. 1825), ostler and musician
- ROBERTS, WILLIAM (1773 - 1857), minister (Presb.)
- ROBERTS, WILLIAM Pant Glas (1742 - 1791) Ysbyty Ifan - see WILLIAMS
- ROBERTS, Sir WILLIAM (1830 - 1899), physician - see ROBERTS
- ROBERTS, WILLIAM (d. 1760), freeholder - see ROBERTS, THOMAS
- ROBERTS, WILLIAM CHARLES (1832 - 1903), Presbyterian minister, principal of colleges, and author
- ROBERTS, WILLIAM HENRY (1907 - 1982), actor, broadcaster
- ROBERTS, WILLIAM JOHN (Gwilym Cowlyd; 1828 - 1904), poet, printer, bookseller, bibliophile, and eccentric
- ROBERTS, WILLIAM JOHN (1904 - 1967), Methodist minister and ecumenist
- ROBERTS, WILLIAM MORGAN (1853 - 1923), musician
- ROBERTS, WILLIAM RHYS (1858 - 1929), professor of Greek
- ROBERTSON, EDWARD (1880 - 1964), professor, linguist, and librarian
- ROBERTSON, HENRY (1816 - 1888), civil engineer and railway pioneer