| Sir Sidney Lee FBA | Year of birth 1859 | Year of death 1926 | Year elected 1910 | Fellowship category UK |
| Professor Geoffrey Leech FBA | Year of birth 1936 | Year of death 2014 | Year elected 1987 | Fellowship category UK |
| Dr Georges Lefebvre FBA | Year of birth 1874 | Year of death 1959 | Year elected 1949 | Fellowship category Corresponding |
| Dr Henri Lefebvre FBA | Year of birth 1901 | Year of death 1991 | Year elected 1948 | Fellowship category Corresponding |
| Professor Mary Legge FBA | Year of birth 1905 | Year of death 1986 | Year elected 1974 | Fellowship category UK |
| Professor Émile Legouis FBA | Year of birth 1861 | Year of death 1937 | Year elected 1924 | Fellowship category Corresponding |
| M Philippe-Ernest Legrand FBA | Year of birth 1866 | Year of death 1953 | Year elected 1948 | Fellowship category Corresponding |
| Professor Paul Lehmann FBA | Year of birth 1884 | Year of death 1964 | Year elected 1932 | Fellowship category Corresponding |
| Professor R.A. Leigh CBE, FBA | Year of birth 1915 | Year of death 1987 | Year elected 1969 | Fellowship category UK |
| Mr James Blair Leishman FBA | Year of birth 1902 | Year of death 1963 | Year elected 1963 | Fellowship category UK |
| Professor Michel Lejeune FBA | Year of birth 1900 | Year of death 2000 | Year elected 1976 | Fellowship category Corresponding |
| Professor Jean François Lemarignier FBA | Year of birth 1908 | Year of death 1980 | Year elected 1975 | Fellowship category Corresponding |
| Professor Paul Lemerle FBA | Year of birth 1903 | Year of death 1989 | Year elected 1981 | Fellowship category Corresponding |
| Professor Otto Lenel FBA | Year of birth 1849 | Year of death 1935 | Year elected 1933 | Fellowship category Corresponding |
| Professor Leo FBA | Year of birth 1900 | Year of death 1900 | Year elected 1904 | Fellowship category Corresponding |
| Professor Claudio Leonardi FBA | Year of birth 1926 | Year of death 2010 | Year elected 1988 | Fellowship category Corresponding |