| Sir Basil Markesinis FBA | Year of birth 1944 | Year of death 2021 | Year elected 1997 | Fellowship category UK Emeritus |
| Professor Robert Markus OBE, FBA | Year of birth 1924 | Year of death 2010 | Year elected 1985 | Fellowship category UK Emeritus |
| Professor Henri-Irénée Marrou FBA | Year of birth 1904 | Year of death 1977 | Year elected 1965 | Fellowship category Corresponding |
| Professor Alfred Marshall FBA | Year of birth 1842 | Year of death 1924 | Year elected 1902 | Fellowship category UK |
| Dr Geoffrey Marshall FBA | Year of birth 1929 | Year of death 2003 | Year elected 1971 | Fellowship category UK |
| Sir John Marshall FBA | Year of birth 1876 | Year of death 1958 | Year elected 1936 | Fellowship category UK |
| Professor David Martin FBA | Year of birth 1929 | Year of death 2019 | Year elected 2007 | Fellowship category UK Emeritus |
| Professor Henri-Jean Martin FBA | Year of birth 1924 | Year of death 2007 | Year elected 1995 | Fellowship category Corresponding |
| Professor Louis Martz FBA | Year of birth 1913 | Year of death 2001 | Year elected 1979 | Fellowship category Corresponding |
| Professor Masao Maruyama FBA | Year of birth 1914 | Year of death 1996 | Year elected 1982 | Fellowship category Corresponding |
| Dr Tomas Garrigue Masaryk FBA | Year of birth 1850 | Year of death 1937 | Year elected 1920 | Fellowship category Corresponding |
| Professor Eric Mascall FBA | Year of birth 1905 | Year of death 1993 | Year elected 1974 | Fellowship category UK |
| Professor Doreen Massey FBA | Year of birth 1944 | Year of death 2016 | Year elected 2002 | Fellowship category UK |
| Professor Peter Mathias CBE, FBA | Year of birth 1928 | Year of death 2016 | Year elected 1977 | Fellowship category UK Emeritus |
| Professor Henry Matthew FBA | Year of birth 1941 | Year of death 1999 | Year elected 1991 | Fellowship category UK |
| Professor Peter Matthews FBA | Year of birth 1932 | Year of death 2021 | Year elected 1985 | Fellowship category UK |