| Dr Emmanuel Laroche FBA | Year of birth 1914 | Year of death 1991 | Year elected 1984 | Fellowship category Corresponding |
| Professor Jakob Aall Ottesen Larsen FBA | Year of birth 1888 | Year of death 1974 | Year elected 1967 | Fellowship category Corresponding |
| Professor Victor Lasareff FBA | Year of birth 1900 | Year of death 1900 | Year elected 1959 | Fellowship category Corresponding |
| Miss Mary Lascelles FBA | Year of birth 1900 | Year of death 1995 | Year elected 1962 | Fellowship category UK |
| Hon Chief Justice Bora Laskin FBA | Year of birth 1912 | Year of death 1984 | Year elected 1972 | Fellowship category Corresponding |
| Professor Peter Lasko CBE, FBA | Year of birth 1924 | Year of death 2003 | Year elected 1978 | Fellowship category UK |
| Mr Peter Laslett CBE, FBA | Year of birth 1915 | Year of death 2001 | Year elected 1979 | Fellowship category UK |
| Mr Robert Latham CBE, FBA | Year of birth 1912 | Year of death 1995 | Year elected 1982 | Fellowship category UK |
| Professor Bruno Latour FBA | Year of birth None | Year of death 2022 | Year elected 2016 | Fellowship category Corresponding |
| Professor Dr Kurt Latte FBA | Year of birth 1891 | Year of death 1964 | Year elected 1948 | Fellowship category Corresponding |
| M Jean-Phillippe Lauer FBA | Year of birth 1900 | Year of death 2001 | Year elected 1984 | Fellowship category Corresponding |
| Sir Hersch Lauterpacht QC, FBA | Year of birth 1897 | Year of death 1960 | Year elected 1948 | Fellowship category UK |
| Professor John Laver CBE, FBA, FRSE | Year of birth 1938 | Year of death 2020 | Year elected 1990 | Fellowship category UK Emeritus |
| M Ernest Lavisse FBA | Year of birth 1842 | Year of death 1922 | Year elected 1916 | Fellowship category Corresponding |
| Dr Vivien Law FBA | Year of birth 1954 | Year of death 2002 | Year elected 1999 | Fellowship category UK |
| Mr Arnold Walter Lawrence Hon FBA | Year of birth 1900 | Year of death 1991 | Year elected 1982 | Fellowship category Honorary |