| Professor Juan Linz FBA | Year of birth 1926 | Year of death 2013 | Year elected 1997 | Fellowship category Corresponding |
| Professor Edward Lipinski FBA | Year of birth 1888 | Year of death 1986 | Year elected 1979 | Fellowship category Corresponding |
| Professor Michael Lipton FBA | Year of birth 1937 | Year of death 2022 | Year elected 2006 | Fellowship category UK |
| Dr Andrew George Little FBA | Year of birth 1863 | Year of death 1945 | Year elected 1922 | Fellowship category UK |
| Dr Ian Little CBE, FBA | Year of birth 1918 | Year of death 2012 | Year elected 1973 | Fellowship category UK Emeritus |
| Professor Vladimir Livshits FBA | Year of birth 1923 | Year of death 2017 | Year elected 1977 | Fellowship category Corresponding |
| Sir John Lloyd FBA | Year of birth 1861 | Year of death 1947 | Year elected 1930 | Fellowship category UK |
| Professor Seton Lloyd CBE, FBA | Year of birth 1902 | Year of death 1996 | Year elected 1955 | Fellowship category UK |
| Professor Tony Lloyd FBA | Year of birth 1916 | Year of death 1994 | Year elected 1993 | Fellowship category UK |
| Sir Hugh Lloyd-Jones FBA | Year of birth 1922 | Year of death 2009 | Year elected 1966 | Fellowship category UK |
| Professor David Lockwood CBE, FBA | Year of birth 1929 | Year of death 2014 | Year elected 1976 | Fellowship category UK Emeritus |
| Professor Einar Löfstedt FBA | Year of birth 1880 | Year of death 1955 | Year elected 1931 | Fellowship category Corresponding |
| Revd Bernard J F Lonergan SJ, FBA | Year of birth 1904 | Year of death 1984 | Year elected 1975 | Fellowship category Corresponding |
| Professor Roger Lonsdale FBA | Year of birth 1933 | Year of death 2022 | Year elected 1991 | Fellowship category UK Emeritus |
| Professor Robert Sabatino Lopez FBA | Year of birth 1910 | Year of death 1986 | Year elected 1976 | Fellowship category Corresponding |
| Professor William Lorimer FBA | Year of birth 1885 | Year of death 1967 | Year elected 1953 | Fellowship category UK |