| Professor Peter Alexander CBE, FBA | Year of birth 1893 | Year of death 1969 | Year elected 1951 | Fellowship category UK |
| Professor Samuel Alexander OM, FBA | Year of birth 1859 | Year of death 1938 | Year elected 1913 | Fellowship category UK |
| Academician Mikhail Pavlovich Alexeyev FBA | Year of birth 1896 | Year of death 1981 | Year elected 1972 | Fellowship category Corresponding |
| Professor Andreas Alföldi FBA | Year of birth 1895 | Year of death 1981 | Year elected 1947 | Fellowship category Corresponding |
| Professor Donald Allan FBA | Year of birth 1907 | Year of death 1978 | Year elected 1954 | Fellowship category UK |
| Dr John Allan CB, FBA | Year of birth 1884 | Year of death 1955 | Year elected 1941 | Fellowship category UK |
| Dr Frank Allchin FBA | Year of birth 1923 | Year of death 2010 | Year elected 1981 | Fellowship category UK |
| Sir Carleton Allen QC, FBA | Year of birth 1887 | Year of death 1966 | Year elected 1944 | Fellowship category UK |
| Mr Derek Allen CB, FBA | Year of birth 1910 | Year of death 1975 | Year elected 1963 | Fellowship category UK |
| Professor George Allen CBE, FBA | Year of birth 1900 | Year of death 1982 | Year elected 1965 | Fellowship category UK |
| Professor Percy Stafford Allen FBA | Year of birth 1869 | Year of death 1933 | Year elected 1923 | Fellowship category UK |
| Sir Roy Allen CBE, FBA | Year of birth 1906 | Year of death 1983 | Year elected 1952 | Fellowship category UK |
| Mr Thomas Allen FBA | Year of birth 1862 | Year of death 1950 | Year elected 1922 | Fellowship category UK |
| Professor William Allen FBA | Year of birth 1918 | Year of death 2004 | Year elected 1971 | Fellowship category UK |
| Excmo Sr Dámaso Alonso FBA | Year of birth 1898 | Year of death 1990 | Year elected 1966 | Fellowship category Corresponding |
| Professor Dr Sedat Alp FBA | Year of birth 1913 | Year of death 2007 | Year elected 1998 | Fellowship category Corresponding |