| Professor Ernest Labrousse FBA | Year of birth 1894 | Year of death 1988 | Year elected 1977 | Fellowship category Corresponding |
| Professor Peter Ladefoged FBA | Year of birth 1925 | Year of death 2006 | Year elected 1992 | Fellowship category Corresponding |
| Professor John Laird FBA | Year of birth 1887 | Year of death 1946 | Year elected 1933 | Fellowship category UK |
| Professor Wilfred Lambert FBA | Year of birth 1926 | Year of death 2011 | Year elected 1971 | Fellowship category UK |
| Professor Ann Lambton OBE, FBA | Year of birth 1912 | Year of death 2008 | Year elected 1964 | Fellowship category UK |
| Professor Étienne Lamotte FBA | Year of birth 1903 | Year of death 1983 | Year elected 1970 | Fellowship category Corresponding |
| Revd Professor Geoffrey Lampe FBA | Year of birth 1912 | Year of death 1980 | Year elected 1963 | Fellowship category UK |
| Professor David Landes FBA | Year of birth 1924 | Year of death 2013 | Year elected 1977 | Fellowship category Corresponding |
| Professor Benno Landsberger FBA | Year of birth 1890 | Year of death 1968 | Year elected 1961 | Fellowship category Corresponding |
| Professor Robert Lane FBA | Year of birth 1917 | Year of death 2017 | Year elected 1995 | Fellowship category Corresponding |
| Mr Andrew Lang FBA | Year of birth 1844 | Year of death 1912 | Year elected 1906 | Fellowship category UK |
| Professor Cecil Lang FBA | Year of birth 1920 | Year of death 2003 | Year elected 1990 | Fellowship category Corresponding |
| Professor Stephen Herbert Langdon FBA | Year of birth 1876 | Year of death 1937 | Year elected 1931 | Fellowship category UK |
| Professor Paul Langford FBA, FrHistS | Year of birth 1945 | Year of death 2015 | Year elected 1993 | Fellowship category UK |
| Professor Charles Rockwell Lanman FBA | Year of birth 1850 | Year of death 1941 | Year elected 1930 | Fellowship category Corresponding |
| Professor Vittorio Lanternari FBA | Year of birth 1918 | Year of death 2010 | Year elected 1988 | Fellowship category Corresponding |