| Professor Henry Jocelyn FBA | Year of birth 1933 | Year of death 2000 | Year elected 1982 | Fellowship category UK |
| Revd Professor Aubrey Johnson FBA | Year of birth 1901 | Year of death 1985 | Year elected 1923 | Fellowship category UK |
| Mr Charles Johnson CBE, FBA | Year of birth 1870 | Year of death 1961 | Year elected 1934 | Fellowship category UK |
| Professor Harry Johnson FBA | Year of birth 1923 | Year of death 1977 | Year elected 1969 | Fellowship category UK |
| Mr William Ernest Johnson FBA | Year of birth 1858 | Year of death 1931 | Year elected 1923 | Fellowship category UK |
| Professor Ron Johnston FBA | Year of birth 1941 | Year of death 2020 | Year elected 1999 | Fellowship category UK |
| Professor James Joll FBA | Year of birth 1918 | Year of death 1994 | Year elected 1977 | Fellowship category UK |
| Professor Arnold Jones FBA | Year of birth 1904 | Year of death 1970 | Year elected 1947 | Fellowship category UK |
| Professor Emrys Jones FBA | Year of birth 1931 | Year of death 2012 | Year elected 1982 | Fellowship category UK |
| Professor Emrys Jones FBA | Year of birth 1920 | Year of death 2006 | Year elected 2003 | Fellowship category UK |
| Professor Gareth Jones QC, FBA | Year of birth 1930 | Year of death 2016 | Year elected 1982 | Fellowship category UK Emeritus |
| Sir Henry Jones CH, FBA | Year of birth 1852 | Year of death 1922 | Year elected 1904 | Fellowship category UK |
| Sir Henry Stuart Jones FBA | Year of birth 1867 | Year of death 1939 | Year elected 1915 | Fellowship category UK |
| Dr Philip Jones FBA | Year of birth 1921 | Year of death 2006 | Year elected 1984 | Fellowship category UK |
| Dr William Henry Samuel Jones FBA | Year of birth 1876 | Year of death 1963 | Year elected 1944 | Fellowship category UK |
| Professor Finnur Jónsson FBA | Year of birth 1858 | Year of death 1934 | Year elected 1920 | Fellowship category Corresponding |