| Professor Ian Jack FBA | Year of birth 1923 | Year of death 2008 | Year elected 1986 | Fellowship category UK |
| Dr Henry Jackson OM, FBA | Year of birth 1839 | Year of death 1921 | Year elected 1903 | Fellowship category UK |
| Professor Kenneth Jackson CBE, FBA | Year of birth 1909 | Year of death 1991 | Year elected 1903 | Fellowship category UK |
| Professor Richard Jackson FBA | Year of birth 1903 | Year of death 1986 | Year elected 1966 | Fellowship category UK |
| Professor Ernest Jacob FBA | Year of birth 1894 | Year of death 1971 | Year elected 1946 | Fellowship category UK |
| Professor Thorkild Jacobsen FBA | Year of birth 1900 | Year of death 1993 | Year elected 1977 | Fellowship category Corresponding |
| Dr Paul Jacobsthal FBA | Year of birth 1880 | Year of death 1957 | Year elected 1936 | Fellowship category Corresponding |
| Dr Felix Jacoby FBA | Year of birth 1876 | Year of death 1959 | Year elected 1945 | Fellowship category Corresponding |
| Professor Werner Jaeger FBA | Year of birth 1888 | Year of death 1961 | Year elected 1927 | Fellowship category Corresponding |
| Professor William Jaffé FBA | Year of birth 1898 | Year of death 1980 | Year elected 1977 | Fellowship category Corresponding |
| Professor Gustav Jahoda FBA, FRSE | Year of birth 1920 | Year of death 2016 | Year elected 1988 | Fellowship category UK Emeritus |
| Professor Roman Jakobson FBA | Year of birth 1896 | Year of death 1982 | Year elected 1974 | Fellowship category Corresponding |
| Mr Harry James CBE, FBA | Year of birth 1923 | Year of death 2009 | Year elected 1976 | Fellowship category UK |
| Dr Montague Rhodes James OM, FBA | Year of birth 1862 | Year of death 1936 | Year elected 1903 | Fellowship category UK |
| Professor Wendy James CBE, FBA | Year of birth 1940 | Year of death 2024 | Year elected 1999 | Fellowship category UK Emeritus |
| Professor William James FBA | Year of birth 1842 | Year of death 1910 | Year elected 1907 | Fellowship category Corresponding |