| Professor John Stuart Mackenzie FBA | Year of birth 1860 | Year of death 1935 | Year elected 1934 | Fellowship category UK |
| Professor Neil MacKenzie FBA | Year of birth 1926 | Year of death 2001 | Year elected 1996 | Fellowship category UK |
| Professor William MacKenzie CBE, FBA | Year of birth 1909 | Year of death 1996 | Year elected 1968 | Fellowship category UK |
| Dr Piers Mackesy FBA | Year of birth 1924 | Year of death 2014 | Year elected 1988 | Fellowship category UK Emeritus |
| Professor John Mackie FBA | Year of birth 1917 | Year of death 1981 | Year elected 1974 | Fellowship category UK |
| Professor Donald MacKinnon FBA | Year of birth 1913 | Year of death 1994 | Year elected 1978 | Fellowship category UK |
| Right Hon the Earl Harold Macmillan OM, PC, Hon FBA, FRS | Year of birth 1894 | Year of death 1986 | Year elected 1981 | Fellowship category Honorary |
| Professor Richard MacNeish FBA | Year of birth 1918 | Year of death 2001 | Year elected 1973 | Fellowship category Corresponding |
| Revd Professor John Macquarrie FBA | Year of birth 1919 | Year of death 2007 | Year elected 1984 | Fellowship category UK |
| Professor Angus Maddison FBA | Year of birth 1926 | Year of death 2010 | Year elected 1994 | Fellowship category Corresponding |
| Professor Wilferd Madelung FBA | Year of birth 1930 | Year of death 2023 | Year elected 1999 | Fellowship category UK Emeritus |
| Dr Ibrahim Madkour FBA | Year of birth 1900 | Year of death 1900 | Year elected 1974 | Fellowship category Corresponding |
| Professor Herwig Maehler FBA | Year of birth 1935 | Year of death 2021 | Year elected 1986 | Fellowship category UK Emeritus |
| Professor Vitorino Magalhães-Godinho FBA | Year of birth 1918 | Year of death 2011 | Year elected 1974 | Fellowship category Corresponding |
| Sir Denis Mahon CH, FBA | Year of birth 1910 | Year of death 2011 | Year elected 1964 | Fellowship category UK Emeritus |
| Professor Frederic William Maitland FBA | Year of birth 1850 | Year of death 1906 | Year elected 1902 | Fellowship category UK |