# List of fellows of the Royal Society M, N, O

About 8,000 fellows have been elected to the Royal Society of London since its inception in 1660. Below is a list of people who are or were Fellow or Foreign Member of the Royal Society. The date of election to the fellowship follows the name. Dates in brackets relate to an award or event associated with the person.
The Society maintains complete online list. This list is complete up to and including 2019.
List of Fellows and Foreign Members of the Royal Society :
| A, B, C | D, E, F | G, H, I | J, K, L | M, N, O | P, Q, R | S, T, U, V | W, X, Y, Z |

## List of fellows
### M

| Name | Election date | Notes |
| Otto Maass | 1940-03-14 | 8 July 1890 – 3 July 1961 Prof. of Physical Chemistry, Montreal |
| Alexander Macalister | 1881-06-02 | 9 April 1844 – 2 September 1919 |
| Archibald Byron Macallum | 1906-05-03 | 10 April 1858 – 5 April 1934 |
| Robert MacAndrew | 1853-06-02 | 22 March 1801 – 22 May 1873 |
| Justin Macarthy | 1770-04-05 | fl 1770 |
| George Macartney, 1st Earl Macartney | 1792-06-07 | 14 May 1737 – 31 March 1806 |
| James Macartney | 1811-02-21 | 8 March 1770 – 6 March 1843 |
| Francis Sowerby Macaulay | 1928-05-10 | 12 February 1862 – 9 February 1937 |
| Thomas Babington Macaulay, Baron Macaulay | 1849-11-22 | 25 October 1800 – 28 December 1859 |
| Zachary Macaulay | 1821-02-08 | 2 May 1768 – 13 May 1838 |
| Forbes Macbean | 1786-11-09 | 1725 – 11 November 1800 |
| Ernest William MacBride | 1905-05-11 | 12 December 1866 – 17 November 1940 |
| James MacCullagh | 1843-02-02 | 1809 – 24 October 1847 |
| John MacCulloch | 1820-05-18 | 6 October 1773 – 20 August 1835 |
| Alan Graham MacDiarmid | 2003-05-15 | 14 April 1927 – 7 February 2007 |
| David Keith Chalmers Macdonald | 1960-03-24 | 24 July 1920 – 28 July 1963 Physicist |
| Hector Munro Macdonald | 1901-06-06 | 19 January 1865 – 16 May 1935 |
| Ian Grant Macdonald | 1979-03-15 | 11 October 1928 – 8 August 2023 |
| James Ramsay MacDonald | 1930-06-26 | 13 October 1866 – 9 November 1937 Statute |
| John MacDonald | 1800-05-15 | 30 October 1759 – 16 August 1831 Military Engineer |
| John Denis Macdonald | 1859-06-09 | 26 October 1826 – 7 February 1908 Surgeon |
| John Hay Athole Macdonald, Lord Kingsburgh | 1888-05-03 | 28 December 1836 – 9 May 1919 |
| John Smyth Macdonald | 1917-05-03 | 28 April 1867 – 29 March 1941 Physiologist, Sheffield University |
| Georgina Mary Mace | 2002-05-13 | |
| William Mace | 1745-05-23 | - 17 December 1767 |
| William Macewen | 1895-06-13 | 22 June 1848 – 22 March 1924 |
| Alexander MacFarlane | 1747-02-19 | - 23 August 1755 Judge, Jamaica |
| Robert Gwyn Macfarlane | 1956-03-15 | 26 June 1907 – 26 March 1987 |
| Alistair George James MacFarlane | 1984-03-15 | |
| James Gordon MacGregor | 1900-06-14 | 31 March 1852 – 21 May 1913 |
| John Machin | 1710-11-30 | - 9 June 1751 |
| Charles Macintosh | 1824-04-29 | 29 December 1766 – 25 July 1843 |
| Frank Campbell MacIntosh | 1954-03-18 | 24 December 1909 – 11 September 1992 |
| Angus John Macintyre | 1993-03-11 | |
| Iain MacIntyre | 1996-03-14 | |
| George B. Mackaness | 1976-03-18 | 20 August 1922 – 4 March 2007 Australian Microbiologist |
| Alan Lindsay Mackay | 1988-03-17 | |
| David John Cameron MacKay | 2009-05-15 | |
| George Mackay, 3rd Lord Reay | 1698-11-09 | 1678 – 21 March 1748 |
| Robert Sinclair MacKay | 2000-05-11 | |
| Trudy Frances Charlene Mackay | 2006-05-18 | |
| Andrew Mackenzie | 2014-04-30 | 1956– |
| Andrew Peter Mackenzie | 2015-05-01 | 1964 - Physicist |
| Chalmers Jack Mackenzie | 1946-11-21 | 11 July 1888 – 26 February 1984 |
| Charles Mackenzie | 1815-06-01 | fl 1815 |
| Colin Mackenzie | 1819-06-10 | c. 1753 – 8 May 1821 |
| Francis Humberston Mackenzie, 1st Baron Seaforth | 1794-06-26 | 9 June 1754 – 11 January 1815 |
| George Mackenzie, 1st Earl of Cromartie | 1692-12-14 | 1630 – 17 August 1714 |
| Sir George Steuart Mackenzie | 1815-04-13 | 22 June 1780 – October 1848 |
| James Mackenzie | 1915-05-06 | 12 April 1853 – 26 January 1925 |
| Kenneth Mackenzie, 1st Earl of Seaforth | 1772-11-12 | 1744–1781 |
| George Owen Mackie | 1991-03-14 | British biologist, Canada |
| John William Mackie | 1817-05-15 | c. 1788 – Chaplain to Duke of York |
| William Alexander Mackinnon | 1827-06-14 | 2 August 1789 - 30 April 1870 |
| Allan Roy Mackintosh | 1991-03-14 | 22 January 1936 – 20 December 1995 |
| James Mackintosh | 1813-11-11 | 24 October 1765 – 30 May 1832 |
| Nicholas John Mackintosh | 1987-03-19 | 9 July 1935 - 8 February 2015 Psychologist |
| Gilbert Wakefield Mackmurdo | 1839-05-30 | c. 1788 – 26 August 1869 |
| Sir Herbert Mackworth, 1st Baronet | 1777-01-09 | 1 January 1737 – 25 October 1791 MP |
| Colin MacLaurin | 1719-11-05 | |
| Thomas Maclear | 1831-12-08 | 17 March 1794 – 14 July 1879 |
| David Herman MacLennan | 1994-03-10 | Canadian-born biochemist |
| Ian Calman Muir MacLennan | 2012-04-19 | |
| John James Rickard Macleod | 1923-05-03 | 6 September 1876 – 16 March 1935 |
| Norman Macleod | 1791-03-24 | 4 March 1754 – General in Army |
| Percy Alexander MacMahon | 1890-06-05 | 26 September 1854 – 25 December 1929 |
| William Macmichael | 1817-03-27 | 1784 – 10 January 1839 |
| John (Jake) MacMillan | 1978-03-16 | 13 September 1926 – 12 May 2014 Chemist |
| David W.C. MacMillan | 2012-04-19 | |
| Maurice Harold Macmillan | 1962-05-31 | 10 February 1894 – 29 December 1986 Statute 12 |
| John Benjamin Macneill | 1838-04-05 | c. 1793 – 2 March 1880 |
| Enid Anne Campbell MacRobbie | 1991-03-14 | |
| James Ormiston MacWilliam | 1848-06-09 | 1808 – 4 May 1862 |
| John Alexander MacWilliam | 1916-05-11 | 31 July 1857 – 13 January 1937 |
| Paul Anthony Madden | 2001-05-10 | |
| Frederick Madden | 1832-02-02 | 16 February 1801 - 08 Mar 1873 |
| Ieuan Maddock | 1967-03-16 | 29 March 1917 – 29 December 1988 |
| John Royden Maddox | 2000-05-11 | Honorary |
| Simon Hugh Piper Maddrell | 1981-03-19 | |
| John Maddy | 1817-06-12 | c. 1765 – 17 June 1853 |
| Scipione Maffei | 1736-12-23 | 2 June 1675 – 11 February 1755 |
| John Hyacinth de Magalhaens | 1774-04-21 | 5 November 1722 – 7 February 1790 |
| Lorenzo Magalotti | 1709-05-04 | ? 23 October 1637 – ? 2 March 1711 |
| William Magee, Archbishop of Dublin | 1813-11-11 | 18 March 1766 – 18 August 1831 |
| Philip D. Magnus [de] | 1985-03-21 | |
| George Magrath | 1819-06-24 | 1775 – 12 June 1857 |
| Eleanor Anne Maguire | 2016-04-29 | 27 March 1970 – |
| Lakshminarayanan Mahadevan | 2016-04-29 | |
| Prasanta Chandra Mahalanobis | 1945-03-22 | 29 June 1893 – 28 June 1972 |
| Panchanan Maheshwari | 1965-03-18 | 9 November 1904 – 18 May 1966 Professor of Botany, Delhi Univ. |
| Kurt Mahler | 1948-03-18 | 27 July 1903 – 25 February 1988, mathematician |
| Yadvinder Malhi | 2017-05-05 | |
| Charles Mahon, 3rd Earl Stanhope | 1772-11-19 | 3 August 1753 – 15 December 1816 |
| Philip Henry Mahon, 4th Earl Stanhope | 1807-01-08 | 4 December 1781 – 2 March 1855 |
| Philip Henry Mahon, 5th Earl Stanhope | 1827-03-22 | 30 January 1805 – 24 December 1875 |
| Yiu-Wing Mai [zh] | 2008-05-16 | |
| Joseph Henry Maiden | 1916-05-11 | 25 April 1859 – 16 November 1925 |
| John Paul Maier | 1999-05-13 | |
| Robert Main | 1860-06-07 | 12 July 1808 – 9 May 1878 |
| Henry James Sumner Maine | 1874-06-04 | 15 August 1822 – 03 |
| Philip Maini | 2015-05-01 | 1959-10-16 - Professor of Mathematical Biology |
| Ravinder Nath Maini | 2007-05-17 | |
| Robert James Mair | 2007-05-17 | |
| Ebenezer Fuller Maitland | 1829-03-28 | c. 1780 – 1 November 1858 Landowner, MP for Wallingford |
| John Gorham Maitland | 1847-04-15 | 1818 – 27 April 1863 Barrister & civil servant |
| Samuel Roffey Maitland | 1839-04-18 | 7 January 1792 – 19 January 1866 clergyman |
| William Maitland | 1733-04-12 | c. 1693 – 16 July 1757 Historian, Writer |
| Peter Michael Maitlis | 1984-03-15 | |
| Montague Maizels | 1961-03-16 | 30 September 1899 – 10 February 1976 |
| Ashhurst Majendie | 1821-06-28 | 24 April 1784 – 7 October 1867 |
| John James Majendie | 1768-04-14 | 1709 – 7 August 1783 Clergyman |
| Lewis Majendie | 1794-07-03 | - 1838 Army Officer & Antiquary |
| Charles Immanuel Forsyth Major | 1908-05-07 | 15 August 1843 – 25 March 1923 |
| Tak Wah Mak | 1994-03-10 | |
| Roger Mellor Makins, 1st Baron Sherfield | 1986-06-26 | 3 February 1904 – 9 February 1996 |
| John Malcolm | 1824-02-26 | 2 May 1769 – 30 April 1833 |
| John Grant Malcolmson | 1840-04-30 | 17 November 1802 – 23 March 1844 geologist |
| John Christian Malet | 1882-06-08 | 25 December 1847 – 9 April 1901 Prof of Mathematics, Queens College, Cork |
| Charles Warre Malet | 1806-01-23 | ? 1753 – 15 December 1815 Diplomat, Governor of Bombay |
| Michael Henry Malim | 2007-05-17 | |
| John William Mallet | 1877-06-07 | 10 October 1832 – 7 November 1912 |
| Robert Mallet | 1854-06-01 | 3 June 1810 – 5 November 1881 |
| John Malliet | 1767-04-02 | - 1786 |
| Henry Reginald Arnulph Mallock | 1903-06-11 | 12 March 1851 – 26 June 1933 Mechanic |
| Paul Jacques Malouin | 1753-03-01 | 29 June 1701 – ? 31 December 1777 |
| Marcello Malpighi | 1669-03-04 | 10 March 1628 – ? 30 November 1694 |
| Edward Maltby | 1824-02-19 | 6 April 1770 – 3 July 1859 |
| Thomas Robert Malthus | 1818-03-05 | ? 17 February 1766 – 23 December 1834 |
| Jean Paul de Gua de Malves | 1743-03-10 | c. 1714 – 2 June 1785 |
| Charles Manby | 1853-06-02 | 5 February 1804 – 31 July 1884 |
| George William Manby | 1831-05-12 | 28 November 1765 – 18 November 1854 |
| Joel Mandelstam | 1971-03-18 | |
| Stanley Mandelstam | 1962-03-15 | theoretical physicist |
| Lewis Norman Mander | 1990-03-15 | |
| Xaverius Manetti | 1756-11-11 | 1723 – 19 November 1785 |
| Eustachio Manfredi | 1728-10-24 | 20 September 1674 – 15 February 1739 |
| James Mangles | 1825-01-20 | 1786 – 18 November 1867 Royal Navy |
| Frederick George Mann | 1947-03-20 | 29 June 1897 – 29 March 1982 |
| Nicholas Mann | 1738-01-26 | - 24 November 1753 Antiquary |
| Stephen Mann | 2003-05-15 | |
| Thaddeus Robert Rudolph Mann | 1951-03-15 | 4 December 1908 – 27 November 1993 |
| Theodore Augustine Mann | 1788-04-03 | 22 June 1735 – 23 February 1809 |
| Ian Manners | 2011-05-19 | |
| Owen Manning | 1767-12-10 | 11 August 1721 – 9 September 1801 Vicar of Godalming |
| Richard Manningham | 1720-03-10 | 1690 – 11 May 1759 |
| David Eusthatios Manolopoulos | 2011-05-19 | |
| Anton Adam Mansberg | 1727-03-09 | fl 1727 |
| James Mansergh | 1901-06-06 | 29 April 1834 – 15 June 1905 |
| Eric Harold Mansfield | 1971-03-18 | |
| Peter Mansfield | 1987-03-19 | |
| Terence Arthur Mansfield | 1987-03-19 | |
| Patrick Manson | 1900-06-14 | 3 October 1844 – 9 April 1922 |
| Gideon Algernon Mantell | 1825-11-24 | 4 February 1790 – 10 November 1852 |
| Ernst Christoph von Manteuffel [de] | 1748-03-24 | 1676 – 30 January 1749 |
| Irene Manton | 1961-03-16 | 17 April 1904 – 31 May 1988 |
| Nicholas Stephen Manton | 1996-03-14 | |
| Sidnie Milana Manton | 1948-03-18 | 4 May 1902 – 2 January 1979 |
| John Mapletoft | 1676-02-10 | 15 June 1631 – 10 November 1721 |
| Leslie William Mapson | 1969-03-20 | 17 November 1907 – 3 December 1970 |
| Richard Marais | 2018-05-09 | |
| Alexander John Gaspard Marcet | 1808-06-02 | 1770 – 19 October 1822 |
| Francis Marcet | 1836-01-28 | 25 May 1803 – 12 April 1883 |
| William Marcet | 1857-06-11 | 13 May 1828 – 4 March 1900 |
| Alfred Le Marchant | 1819-11-25 | fl 1819 |
| Giovanni Giacomo Marinoni [de] | 1746-03-20 | 1676 – 10 January 1755 |
| Leo Edmond Marion | 1961-03-16 | 22 March 1899 – 16 July 1979 |
| Roy Markham | 1956-03-15 | 29 January 1916 – 16 November 1979 |
| Clements Robert Markham | 1873-06-12 | 20 July 1830 – 30 January 1916 |
| George Markham | 1708-04-07 | 1666 – 16 June 1736 Barrister |
| James Heywood Markland | 1816-03-28 | 7 December 1788 – 28 December 1864 |
| Vladimir Markovic | 2014-04-30 | Mathematician, California Institute of Technology |
| Paul Jacob Marperger | 1715-06-09 | 3 October 1683 – 20 November 1767 |
| Jens Marklof | 2015-05-01 | German mathematician |
| John Edward Marr | 1891-06-04 | 14 June 1857 – 1 October 1933 |
| Philippa Charlotte Marrack | 1997-05-15 | |
| Guy Frederic Marrian | 1944-03-16 | 3 March 1904 – 24 July 1981 |
| Frederick Marryat | 1819-05-13 | 10 July 1792 – 9 August 1848 |
| Charles David Marsden | 1983-03-17 | 15 April 1938 – 29 September 1998 |
| Jerrold Eldon Marsden | 2006-05-18 | 17 August 1942 – 21 September 2010 Prof of Engineering, Caltech |
| Ernest Marsden | 1946-03-21 | 20 February 1889 – ? 14 December 1970 Fellow 1946-03-21 |
| William Marsden | 1783-01-23 | 16 November 1754 – 6 October 1836 |
| Herbert Marsh, Bishop of Peterborough | 1801-01-08 | 10 December 1757 – 1 May 1839 |
| James Ernest Marsh | 1906-05-03 | 5 July 1860 – 13 April 1938 Chemist |
| Arthur Milnes Marshall | 1885-06-04 | 8 June 1852 – 31 December 1893 |
| Barry James Marshall | 1999-05-13 | |
| Christopher John Marshall | 1995-03-09 | |
| Francis Hugh Adam Marshall | 1920-05-13 | 11 July 1878 – 5 February 1949 |
| Guy Anstruther Knox Marshall | 1923-05-03 | 20 December 1871 – 8 April 1959 |
| Hugh Marshall | 1904-05-05 | 7 January 1868 – 6 September 1913 |
| John Marshall | 1857-06-11 | 11 September 1818 – 1 January 1891 Surgeon |
| John Charles Marshall | 2008-05-16 | |
| Norman Bertram Marshall | 1970-03-19 | 6 February 1915 – 13 February 1996 Zoologist |
| Robin Marshall | 1995-03-09 | |
| Sheina Macalister Marshall | 1963-03-21 | 20 April 1896 – 7 April 1977 |
| Walter Charles Marshall, Baron Marshall of Goring | 1971-03-18 | 6 March 1932 – 20 February 1996 |
| Charles Marsham, 1st Earl of Romney | 1776-03-14 | 28 September 1744 – 1 March 1811 |
| Robert Marsham | 1780-03-09 | c. 1707 – 4 September 1797 |
| Robert Marsham, 1st Baron Romney | 1723-11-21 | 17 September 1685 – 28 November 1724 |
| Robert Marsham, 2nd Baron Romney | 1757-05-19 | 22 August 1717 – 16 November 1793 |
| Thomas Nelson Marsham | 1986-03-20 | 10 November 1923 – 12 October 1989 |
| Luigi Ferdinand, Count Marsigli | 1691-11-25 | ? 10 July 1658 – 1 November 1730 |
| Giovanni Marsili | 1758-04-06 | - 1773 |
| Hedley Ralph Marston | 1949-03-17 | 26 August 1900 – 25 August 1965 |
| Robert A. Martienssen | 2006-05-18 | |
| Alan Douglas Martin | 2004-05-27 | |
| Archer John Porter Martin | 1950-03-16 | 1 March 1910 – 28 July 2002 |
| Cathie Martin | 2018-05-09 | 1955 |
| Charles James Martin | 1901-06-06 | 10 January 1866 – 15 February 1955 |
| George Steven Martin | 1998-05-14 | |
| Henry Newell Martin | 1885-06-04 | 1 July 1848 – 27 October 1896 |
| James Ranald Martin | 1845-02-13 | 1793 – 27 November 1874 |
| Leslie Harold Martin | 1957-03-21 | 22 December 1900 – 1 February 1983 |
| Matthew Martin | 1794-07-10 | 1748 – 20 November 1838 Merchant of Exeter |
| Sidney Harris Cox Martin | 1895-06-13 | 8 April 1860 – 22 September 1924 |
| Thomas John Martin | 2000-05-11 | |
| George Martine | 1740-12-11 | 1700 – ? April 1741 |
| David Forbes Martyn | 1950-03-16 | 27 June 1906 – 5 March 1970 |
| John Martyn | 1727-03-30 | 12 September 1699 – 29 January 1768 |
| Thomas Martyn | 1786-05-18 | 23 September 1735 – 3 June 1825 |
| Martin van Marum | 1798-04-19 | 20 March 1750 – 26 December 1837 |
| Francis Maseres | 1771-05-02 | 15 December 1731 – 19 May 1824 |
| Raghunath Anant Mashelkar | 1998-05-14 | |
| Ernest John Maskell | 1939-03-16 | 2 February 1895 – 20 December 1958 |
| Nevil Maskelyne | 1758-04-27 | 6 October 1732 – 9 February 1811 |
| Basil John Mason | 1965-03-18 | |
| Charles Mason | 1742-06-24 | c. 1699 – 18 December 1771 Clergyman, Geologist |
| Paul James Mason | 1995-03-09 | |
| Ronald Mason | 1975-03-20 | Prof of Chemistry, Sussex University |
| Stephen Finney Mason | 1982-03-18 | Physical Chemist |
| Thomas Godfrey Mason | 1937-05-06 | 24 July 1890 – 22 October 1959 Plant physiologist, Trinidad |
| David William Masser | 2005-05-26 | |
| Victor Ame Philippe Ferrero de Fiesque Masseran | 1770-01-11 | - 1777 |
| Richard Myddleton Massey | 1712-10-23 | c. 1678 – 27 March 1743 |
| Harrie Stewart Wilson Massey | 1940-03-14 | 16 May 1908 – 27 November 1983 |
| Vincent Massey | 1977-03-17 | 28 November 1926 – 26 August 2002 |
| Jean Masson | 1743-12-08 | fl 1743 Chevalier de Besse |
| David Orme Masson | 1903-06-11 | 13 January 1858 – 10 August 1937 |
| James Irvine Orme Masson | 1939-03-16 | 3 September 1887 – 22 October 1962 |
| Arthur Thomas Masterman | 1915-05-06 | 10 April 1869 – 10 February 1941 Fellow 1915-05-06 |
| Maxwell Tylden Masters | 1870-06-02 | 15 April 1833 – 30 May 1907 |
| Thomas Guy Masters | 2005-05-26 | |
| Yoshio Masui | 1998-05-14 | |
| Antonio Matani [it] | 1763-03-10 | 27 July 1730 – 21 June 1779 |
| Gerhard Theodor Materlik | 2011-05-19 | |
| Cotton Mather | 1713-07-27 | 13 February 1663 – 13 February 1728 |
| Robert Mather | 1729-05-08 | c. 1700 – 6 January 1730 |
| Kenneth Mather | 1949-03-17 | 22 June 1911 – 21 March 1990 |
| Thomas Mather | 1902-06-05 | 15 December 1856 – 23 June 1937 |
| Nicholas James Sutherland Matheson | 1846-02-19 | 1796 – 31 December 1878 Jardine Matheson Bank |
| William Mathew | 1720-03-10 | - 30 September 1752 |
| George Ballard Mathews | 1897-06-03 | 24 February 1861 – 19 March 1922 |
| Thomas James Mathias | 1795-03-19 | ? 1754 – August 1835 |
| William George Maton | 1800-06-26 | 31 January 1774 – 30 March 1835 |
| Iain William Mattaj | 1999-05-13 | |
| William Diller Matthew | 1919-05-15 | 20 February 1871 – 24 September 1930 |
| Drummond Hoyle Matthews | 1974-03-21 | 6 February 1931 – 20 July 1997 |
| Leonard Harrison Matthews | 1954-03-18 | 12 June 1901 – 27 November 1986 |
| Paul Taunton Matthews | 1963-03-21 | 20 November 1919 – 26 February 1987 |
| Peter Bryan Conrad Matthews | 1973-03-15 | |
| Richard Ellis Ford Matthews | 1974-03-21 | |
| Bryan Harold Cabot Matthews | 1940-03-14 | 14 June 1906 – 22 July 1986 |
| Philip Matthews | 1671-03-23 | c. 1642 – ? December 1685 |
| George Matthey | 1879-06-12 | 9 May 1825 – 14 February 1913 Refiner, Johnson & Matthey |
| Augustus Matthiessen | 1861-06-06 | 2 January 1831 – 6 October 1870 |
| Matthew Maty | 1751-12-19 | 17 May 1718 – 2 July 1776 |
| Paul Henry Maty | 1771-05-16 | 1745 – 16 January 1787 |
| John Maud | 1738-04-20 | - 8 June 1782 Chemist |
| Israel Mauduit | 1751-06-13 | 1708 – 14 June 1787 |
| Pierre Louis Moreau de Maupertuis | 1728-06-27 | ? 17 July 1698 – 27 July 1759 |
| Douglas Mawson | 1923-05-03 | 5 May 1882 – ? 15 October 1958 |
| King of Bavaria, Maximilian I | 1802-03-04 | 27 May 1756 – 13 October 1825 Royal |
| Joseph Maximilian, Archduke of Austria | 1819-01-21 | 1782–1863 Royal |
| James Clerk Maxwell | 1861-06-06 | 13 June 1831 – 5 November 1879, physicist |
| James Rankin Maxwell | 1997-05-15 | |
| Herbert Eustace Maxwell | 1898-01-27 | 8 January 1845 – 30 October 1937 |
| John Maxwell | 1829-02-26 | 12 May 1791 – 6 June 1865 |
| Murray Maxwell | 1819-02-18 | 10 September 1775 – 26 June 1831 |
| Charles May | 1854-06-01 | 1800 – 10 August 1860 Civil engineer |
| Michael David May | 1991-03-14 | |
| Robert McCredie May, Baron May of Oxford | 1979-03-15 | |
| Christian Mayer | 1765-12-19 | 20 August 1719 – ? 16 April 1783 |
| David Quinn Mayne | 1985-03-21 | |
| John Thomas Mayne | 1818-01-29 | fl 1818 |
| William Valentine Mayneord | 1965-03-18 | 15 February 1902 – 10 August 1988 |
| Mark Mayer | 2019-04-16 | |
| Charles Mayo | 1827-03-01 | 24 March 1767 – 10 December 1858 Prof. of Anglo-Saxon, Oxford |
| Herbert Mayo | 1828-04-17 | ? 3 April 1796 – 15 May 1852 |
| Paul Jose de Mayo | 1975-03-20 | 8 August 1924 – 26 July 1994 |
| Thomas Mayo | 1835-06-04 | 24 January 1790 – 13 January 1871 |
| John Mayow | 1678-11-30 | 24 May 1640 – October 1679 |
| Guillaume Mazeas | 1752-05-28 | 2 August 1720 – 13 September 1775 |
| James William McBain | 1923-05-03 | 22 March 1882 – 12 March 1953 |
| Robert Alexander McCance | 1948-03-18 | 9 December 1898 – 5 March 1993 |
| Andrew McCance | 1943-03-18 | 30 March 1889 – 11 June 1983 |
| John Vincent McCanny | 2002-05-09 | |
| Frank McClean | 1895-06-13 | 13 November 1837 – 8 November 1904 |
| John Robinson McClean | 1869-06-03 | 1813 – 13 July 1873 |
| John Alexander McClelland | 1909-05-06 | 1 December 1870 – 13 April 1920 |
| Sir Francis Leopold McClintock | 1865-06-01 | 8 July 1819 – 17 November 1907 |
| James Desmond Caldwell McConnell | 1987-03-19 | |
| Francis Patrick McCormick | 1996-03-14 | |
| William Symington McCormick | 1928-06-21 | 30 April 1859 – 23 March 1930 Statute |
| Frederick McCoy | 1880-06-03 | 1823 – ? 13 May 1899 |
| William Hunter McCrea | 1952-03-20 | 13 December 1904 – 25 April 1999 |
| Peter McCullagh | 1994-03-10 | |
| Ernest A McCulloch | 1999-05-13 | |
| Malcolm Thomas McCulloch | 2010-05-20 | |
| Arthur Bruce McDonald | 2009-05-15 | |
| Robert McDonnell | 1865-06-01 | 15 March 1828 – 6 May 1889 Surgeon |
| Trevor John McDougall | 2012-04-19 | |
| William McDougall | 1912-05-02 | 22 June 1871 – 28 November 1938 |
| Dusa McDuff | 1994-03-10 | |
| James Dwyer McGee | 1966-03-17 | 17 December 1903 – 28 February 1987 Physicist |
| Simon McGillivray | 1838-03-29 | - 9 June 1840 |
| Ian Alexander McGregor | 1981-03-19 | 26 August 1922 – 1 February 2007 Immunologist |
| James McGrigor | 1816-03-14 | 9 April 1771 – 2 April 1858 |
| William Carmichael McIntosh | 1877-06-07 | 10 October 1838 – 1 April 1931 |
| Michael Edgeworth McIntyre | 1990-03-15 | 1939-7 July 2022 |
| John Gray McKendrick | 1884-06-12 | 12 August 1841 – 2 January 1926 |
| Alexander McKenzie | 1916-05-11 | 6 December 1869 – 11 June 1951 Prof of Chemistry, Univ College, Dundee |
| Andrew N. J. McKenzie | 2017-05-05 | |
| Dan Peter McKenzie | 1976-03-18 | |
| Murdoch McKenzie | 1774-05-19 | - ? October 1797 |
| James McKernan | 2011-05-19 | 1964- |
| Thomas Fulton Wilson McKillop | 2005-05-26 | CEO, AstroZeneca |
| Gareth H. McKinley | 2019-04-16 | |
| Andrew David McLachlan | 1989-03-16 | |
| Robert McLachlan | 1877-06-07 | 10 April 1837 – 23 May 1904 Botanist & Entomologist |
| Anne Laura McLaren | 1975-03-20 | biologist, Foreign Secretary for the Royal Society (1991-6) |
| Digby Johns McLaren | 1979-03-15 | 11 December 1919 – 8 December 2004 |
| Keith Alan McLauchlan | 1992-03-12 | |
| Angela McLean | 2009-05-15 | |
| Irwin McLean | 2014-04-30 | Geneticist, Dundee University |
| Alexander McLeay | 1809-01-19 | 24 June 1767 – 18 July 1848 |
| John Cunningham McLennan | 1915-05-06 | 14 April 1867 – 9 October 1935 |
| Thomas Charles Buckland McLeish | 2011 | |
| Herbert McLeod | 1881-06-02 | 20 February 1841 – 1 October 1923 Chemist, Royal Indian Eng.Coll. |
| James Walter McLeod | 1933-05-11 | 2 January 1887 – 11 March 1978 Prof. of Bacteriology |
| John Bryce McLeod | 1992-03-12 | |
| Andrew Paul McMahon | 2007-05-17 | |
| Charles Alexander McMahon | 1898-06-09 | 24 March 1830 – 21 February 1904 Geologist |
| Harvey Thomas McMahon | 2008-05-16 | Molecular Biologist, Cambridge |
| Andrew James McMichael | 1992-03-12 | Molecular Biologist, MRC |
| John McMichael | 1957-03-21 | 25 July 1904 – 3 March 1993 |
| David Roberts McMurtry | 2011-05-19 | |
| John Michael McNamara | 2012-04-19 | |
| James McFadyen McNeill | 1949-03-17 | 19 August 1892 – 24 July 1964 |
| Bryan Austin McSwiney | 1944-03-16 | 20 May 1894 – 8 March 1947 |
| Gilean Alistair Tristram McVean | 2016-04-29 | |
| John Graham McWhirter | 1999-05-13 | |
| Richard Mead | 1703-11-30 | 11 August 1673 – 16 February 1754 |
| Samuel Mead | 1739-03-08 | - 11 October 1776 |
| Thomas Wilson Meade | 1996-03-14 | |
| Pierre François Andre Méchain | 1789-04-30 | ? 16 April 1744 – ? 20 September 1805 |
| Peter Brian Medawar | 1949-03-17 | 28 February 1915 – 2 October 1987 |
| Henry Benedict Medlicott | 1877-06-07 | 3 August 1829 – 6 April 1905 |
| Gerard Meerman | 1760-04-24 | 6 December 1722 – 15 December 1771 |
| Charles Edward Kenneth Mees | 1939-03-16 | 26 May 1882 – 15 August 1960 |
| Goverdhan Mehta | 2005-05-26 | |
| Raphael Meldola | 1886-06-04 | 19 July 1849 – 16 November 1915, chemist |
| Charles Meldrum | 1876-06-01 | 19 October 1821 – 28 August 1901 |
| John Mellanby | 1929-05-02 | 12 June 1878 – 15 July 1939 |
| Edward Mellanby | 1925-05-07 | 8 April 1884 – 30 January 1955 |
| Pierre de Mellarede | 1713-06-11 | c. 1659 – 19 March 1730 |
| Martinho de Mello e Castro | 1757-04-21 | fl 1757 |
| Sebastian Joseph de Carvalho e Marquis of Pombal Mello | 1740-05-15 | 13 May 1699 – 8 May 1782 |
| Joseph William Mellor | 1927-05-12 | 9 July 1869 – 24 May 1938 |
| James Cosmo Melvill | 1841-01-14 | 1792 – 23 July 1861 Secretary to East India Co |
| Robert Melvill | 1775-02-16 | 12 October 1723 – 29 August 1809 General in British Army |
| Alexander Melville | 1827-02-01 | 14 October 1790 – 16 September 1840 Supt East India Co Mint |
| Harry Work Melville | 1941-03-20 | 27 April 1908 – 15 June 2000 Professor of Chemistry |
| Bruno Mendel [de] | 1957-03-21 | 3 November 1897 – 23 August 1959 |
| Kurt Alfred Georg Mendelssohn | 1951-03-15 | 7 January 1906 – 18 September 1980, German-born British medical physicist cryogenic engineering |
| Diego de Mendoca | 1736-02-05 | fl 1736 |
| Joseph Mendoza y Rios | 1793-04-11 | ? 15 September 1762 – ? 3 March 1815 |
| Francisco Xavier de Menezes | 1738-11-02 | fl 1738 |
| Johann Burchard Menkenius | 1699-11-30 | 27 March 1675 – 1 April 1732 |
| Mambillikalathil Govind Kumar Menon | 1970-03-19 | |
| James Woodham Menter | 1966-03-17 | 22 August 1921 – 18 July 2006 |
| Alexander Danilovich Menzicoff | 1714-07-29 | ? 1673 – ? 12 November 1729 |
| Robert Gordon Menzies | 1965-06-03 | 20 December 1894 – 15 May 1978, twelfth Prime Minister of Australia |
| Nicholas Mercator | 1666-11-14 | c. 1620 – ? February 1687 |
| Frank Brian Mercer | 1984-03-15 | 22 December 1927 – 22 November 1998 |
| James Mercer | 1922-05-11 | 15 January 1883 – 21 February 1932 |
| John Mercer | 1852-06-03 | 22 February 1791 – 30 November 1866 |
| Roger Meredith | 1681-04-06 | 1637 – 17 February 1701 |
| William George Meredith | 1830-03-18 | c. 1804 – August 1831 |
| John Meres | 1724-03-12 | - 1726 Apothecary |
| John Meres | 1719-03-12 | - 22 February 1736 |
| Thomas Meres | 1686-12-08 | c. 1662 - |
| John Merewether | 1838-05-03 | 1797 – 4 April 1850 |
| Christopher Merrett | 1663-05-20 | ? 16 February 1614 – 19 August 1695 Original Fellow 1664-05-20 |
| Charles Watkins Merrifield | 1863-06-04 | 20 October 1827 – 1 January 1884 |
| John Merrill | 1745-03-21 | fl 1745 Mathematician |
| Alexander Walter Merrison | 1969-03-20 | 21 March 1924 – 19 February 1989 |
| Patrick Anthony Merton | 1979-03-15 | 8 October 1920 – 13 June 2000 |
| Thomas Ralph Merton | 1920-05-13 | 12 January 1888 – 10 October 1969 |
| Rudolf Messel | 1912-05-02 | 14 January 1848 – 18 April 1920 |
| Charles Messier | 1764-12-06 | 26 June 1730 – ? 12 April 1817 |
| Leon Mestel | 1977-03-17 | astronomer |
| Donald Metcalf | 1983-03-17 | |
| Philip Metcalfe | 1790-11-04 | c. 1733 – 26 August 1818 |
| Friedrich Christian Meuschen | 1764-04-05 | 1719 - |
| Edward Meyrick | 1904-05-05 | 24 November 1854 – 31 March 1938 |
| James Meyrick | 1800-06-19 | ? 1748 – 27 November 1818 |
| Owen Putland Meyrick | 1776-05-09 | c. 1752 – 24 March 1825 |
| Louis Compton Miall | 1892-06-02 | 13 September 1842 – 21 February 1921 |
| John David Michaelis | 1789-04-30 | 1717 – 22 August 1791 |
| Anthony George Maldon Michell | 1934-05-03 | 21 June 1870 – 17 February 1959 |
| John Michell | 1760-06-12 | 1724 – 21 April 1793 |
| John Henry Michell | 1902-06-05 | 26 October 1863 – 3 February 1940 |
| Richard Michell | 1774-05-12 | 1728–1789 |
| Robert Hall Michell | 1986-03-20 | |
| Pietro Antonio Michelotti | 1718-12-11 | 1680 – 1 January 1740 |
| James Mickleton | 1718-07-03 | fl 1718 |
| Charles Stewart Middlemiss | 1921-05-12 | 22 November 1859 – 11 June 1945 |
| Benjamin Middleton | 1687-12-14 | fl 1668–1712 |
| Christopher Middleton | 1737-04-07 | - 12 February 1770 |
| Thomas Hudson Middleton | 1936-06-25 | 32 August 1863 – 14 May 1943 Statute Bishop of Calcutta |
| Thomas Fanshawe Middleton | 1814-05-19 | 26 January 1769 – 8 July 1822 |
| Paul Midgley | 2014-04-30 | Materials Scientist, Cambridge University |
| John Edwin Midwinter | 1985-03-21 | Prof of Electronic Eng, University College, London |
| John Miers | 1843-03-09 | 25 August 1789 – 17 October 1879 |
| Henry Alexander Miers | 1896-06-04 | 25 May 1858 – 10 December 1942 |
| Gero Miesenböck | 2015-05-01 | 1965-07-15 - Neuroscientist |
| Gerard James Milburn | 2017-05-05 | |
| Ricardo Miledi | 1970-03-19 | |
| Arnold Ashley Miles | 1961-03-16 | 21 March 1904 – 11 February 1988 Fellow 1961-03-16 |
| Henry Miles | 1743-06-09 | 3 June 1698 – 10 February 1763 |
| Mervyn John Miles | 2011-05-19 | |
| Thomas Miles | 1722-03-15 | - 9 December 1767 Clergyman & Headmaster |
| Andrew Millar (scientist) | 2012-04-19 | |
| David Andrew Barclay Miller | 1995-03-09 | |
| Frederick Robert Miller | 1932-05-05 | 2 May 1881 – 11 November 1967 Prof of Physiology, Univ of W.Ontario |
| George Miller | 1827-05-24 | - ? November 1849 Lt-Col in Army |
| Jacques Francis Albert Pierre Miller | 1970-03-19 | |
| John Fletcher Miller | 1850-06-06 | 20 June 1816 – 14 July 1856 |
| Joseph Miller | 1843-03-30 | ? 1798 – 23 February 1860 Marine Engineer |
| Philip Miller | 1730-01-22 | 1691 – 18 December 1771 |
| Roger Ervin Miller [ru] | 2005-05-26 | |
| Stewart Crichton Miller | 1996-03-14 | 2 July 1934 – 7 August 1999 |
| William Allen Miller | 1845-02-06 | 17 December 1817 – 30 September 1870 |
| William Hallowes Miller | 1838-02-08 | 6 April 1801 – 20 May 1880 |
| Daniel Milles | 1675-01-14 | 1626–1689 |
| Edward Milles | 1746-06-19 | - 7 February 1776 Fellow 1747-06-19 |
| Jeremiah Milles | 1775-02-23 | c. 1751 – ? November 1796 |
| Jeremiah Milles | 1742-04-01 | c. 1714 – 13 February 1784 |
| Thomas Milles | 1708-04-07 | 19 June 1671 – 13 May 1740 |
| Langford Millington | 1802-05-06 | - 9 May 1807 |
| Abraham Mills | 1799-05-30 | c. 1750 – 2 March 1828 Mineralogist |
| Anne Mills | 2013-05-02 | |
| Bernard Yarnton Mills | 1963-03-21 | |
| Edmund James Mills | 1874-06-04 | 8 December 1840 – 21 April 1921 |
| Ian Mark Mills | 1996-03-14 | |
| John Mills | 1766-02-13 | c. 1717 – ? 1796 |
| Walter Mills | 1682-07-12 | 1654 – 7 January 1726 Physician |
| William Hobson Mills | 1923-05-03 | 6 July 1873 – 22 February 1959 |
| Francis Milman | 1772-05-07 | 31 August 1746 – 24 June 1821 |
| Edward Arthur Milne | 1926-05-06 | 15 February 1896 – 21 September 1950 |
| John Milne | 1887-06-09 | 30 December 1850 – ? 30 July 1913 |
| Malcolm Davenport Milne | 1978-03-16 | 22 May 1915 – 3 April 1991 |
| Arthur David Milner | 2011-05-19 | |
| Arthur John Robin Gorell Milner | 1988-03-17 | 13 January 1934 – 20 March 2010 Computer Scientist, Cambridge |
| Brenda Atkinson Milner | 1979-03-15 | |
| Isaac Milner | 1780-06-15 | 11 January 1750 – 1 April 1820 |
| Samuel Roslington Milner | 1922-05-11 | 22 August 1875 – 12 August 1958 |
| Richard Monckton Milnes, 1st Baron Houghton | 1868-12-10 | 19 June 1809 – 11 August 1885 |
| César Milstein | 1975-03-20 | 8 October 1927 – 24 March 2002, medicine, Nobel Prize (1984) |
| Edward Milward | 1742-01-14 | c. 1712 – 26 August 1757 |
| Edward Alfred Minchin | 1911-05-04 | 22 February 1866 – 30 September 1915 |
| George Minchin Minchin | 1895-06-13 | 25 May 1845 – 23 March 1914 |
| Daniel Minet | 1767-06-18 | - 25 January 1790 |
| David Michael Patrick Mingos | 1992-03-12 | |
| Andrew Mitchell | 1736-02-26 | 15 April 1708 – 28 January 1771 Diplomat |
| Edgar William John Mitchell | 1986-03-20 | 25 September 1925 – 30 October 2002 |
| George Francis Mitchell | 1973-03-15 | 15 October 1912 – 25 November 1997 |
| George Hoole Mitchell | 1953-03-19 | 31 December 1902 – 11 March 1976 |
| John Mitchell | 1748-12-15 | 14 April 1711 – 29 February 1768 |
| John Francis Brake Mitchell | 2004-05-27 | |
| John Wesley Mitchell | 1956-03-15 | NZ physicist |
| Joseph Stanley Mitchell | 1952-03-20 | 22 July 1909 – 22 February 1987 |
| Peter Chalmers Mitchell | 1906-05-03 | 23 November 1864 – 2 July 1945 |
| Peter Dennis Mitchell | 1974-03-21 | 29 September 1920 – 10 April 1992 |
| John Murdoch Mitchison | 1978-03-16 | 15 June 1922 – 17 March 2011 |
| Nicholas Avrion Mitchison | 1967-03-16 | |
| Timothy John Mitchison | 1997-05-15 | |
| William Mitford | 1749-04-13 | - 1787 Clerk of Chancery Court |
| Ashesh Prosad Mitra | 1988-03-17 | |
| Sisir Kumar Mitra | 1958-03-20 | 24 October 1890 – 13 August 1963 |
| St. George Jackson Mivart | 1869-06-03 | 30 November 1827 – 1 April 1900 |
| Henry Keith Moffatt | 1986-03-20 | |
| James Reid Moir | 1937-05-06 | 13 June 1879 – 24 February 1944 Archaeologist |
| Abraham de Moivre | 1697-11-30 | 26 May 1667 – 27 November 1754 |
| Coote Molesworth | 1731-03-18 | ? 1695 – 29 November 1782 |
| Richard Molesworth | 1786-05-04 | 1737 – 29 September 1799 |
| Richard Molesworth, 3rd Viscount Molesworth | 1722-03-15 | 1680 – 12 October 1758 |
| Robert Molesworth, 1st Viscount Molesworth | 1698-03-23 | 7 September 1656 – 22 May 1725 |
| William Molesworth | 1835-11-26 | 23 May 1810 – 22 October 1855 |
| Pietro Paolo Molinelli | 1749-04-20 | 2 March 1702 – 11 October 1764 |
| Patrick Loudon Mollison | 1968-03-21 | 17 March 1914 – 26 November 2011 Haematologist |
| John Dixon Mollon | 1999-05-13 | |
| Adam Gottlob Moltke | 1764-04-05 | 10 November 1710 – 25 September 1792 |
| Daniel Molyneux | 1736-02-19 | 1708–1738 |
| Samuel Molyneux | 1712-12-01 | ? 16 July 1689 – 13 April 1728 |
| Thomas Molyneux | 1686-11-03 | 14 April 1661 – 19 October 1733 |
| William Molyneux | 1686-02-03 | 17 April 1656 – 11 October 1698 |
| Salvador Moncada | 1988-03-17 | |
| Andre Monceaux | 1670-12-15 | fl 1670 |
| George Monck, 1st Duke of Albemarle | 1665-01-09 | 6 December 1608 – 3 January 1670 |
| Alexander Moncrieff | 1871-06-08 | 17 April 1829 – 3 August 1906 Military Engineer |
| Alfred Moritz Mond, 1st Baron Melchett | 1928-06-21 | 24 October 1868 – 27 December 1930 Statute, chemist |
| Ludwig Mond | 1891-06-04 | 7 March 1839 – 11 December 1909, 1928, chemist |
| Robert Ludwig Mond | 1938-03-17 | 9 September 1867 – 22 October 1938, chemist and archaeologist |
| William Taylor Money | 1818-06-11 | - July 1834 |
| Louis Guillaume Le Monnier | 1745-02-07 | 27 June 1717 – 7 September 1799 |
| Pierre Charles Le Monnier | 1739-04-05 | 20 November 1715 – ? 31 May 1799 |
| Alexander Monro | 1723-06-27 | 8 September 1697 – 10 July 1767 |
| Charles Monro | 1821-05-17 | c. 1757 – 25 September 1821 |
| Donald Monro | 1766-04-24 | 15 January 1728 – 9 June 1802 |
| James Monson | 1684-11-12 | c. 1660 – ? 1688 |
| Joseph de Montagny | 1739-06-07 | fl 1739 |
| Charles Montagu, 1st Earl of Halifax | 1695-11-30 | 16 April 1661 – 19 May 1715 Statute 12 |
| Edward Montagu | 1745-12-12 | - 1775 |
| Edward Wortley Montagu | 1750-05-31 | 1713 – 29 April 1776 |
| Edward Montagu, 1st Earl of Sandwich | 1663-05-20 | 27 July 1625 – 28 May 1672 Original |
| Edward Montagu, 2nd Earl of Manchester | 1665-05-10 | 1602 – 5 May 1671 |
| Frederick Montagu | 1792-02-16 | July 1733 – 30 July 1800 |
| George Montagu, 1st Duke of Montagu, 2nd creation | 1749-12-07 | 26 July 1712 – 23 May 1790 |
| John Montagu, 2nd Duke of Montagu | 1718-03-13 | 29 March 1690 – 6 July 1749 |
| John Montagu, 4th Earl of Sandwich | 1740-03-20 | 3 November 1718 – 30 April 1792 |
| Matthew Montagu | 1795-03-05 | fl 1795 |
| Nicholas de Montaudouin | 1749-02-16 | fl 1749 |
| Marques de Monte Leone | 1716-04-05 | fl 1716–1718 |
| Moses Haim Montefiore | 1836-06-16 | 24 October 1784 – 28 July 1885 |
| John Lennox Monteith | 1971-03-18 | 3 September 1929 - 20 July 2012 Physicist |
| William Monteith | 1845-02-13 | 22 June 1790 – 18 April 1864 |
| Charles de Secondat Montesquieu | 1730-02-26 | 18 January 1689 – 10 February 1755 |
| Jean Baptiste Montesquieu | 1744-12-06 | 10 December 1716 – 1796 |
| Thomas George Montgomerie | 1872-06-06 | 23 April 1830 – 31 January 1878 |
| Charles Daniel Trudaine De Montigny | 1766-01-23 | 3 January 1703 – 19 January 1769 |
| Conde de Montijo | 1732-11-16 | fl.1732 |
| Pierre Remond de Montmort | 1715-06-09 | 27 October 1678 – 7 October 1719 |
| Antoine Jean Baptiste Robert Auget Montyon, Baron de Montyon | 1812-11-05 | 26 December 1733 – 29 December 1820 |
| Philip Burton Moon | 1947-03-20 | 17 May 1907 – 9 October 1994 |
| Edward Moor | 1806-05-01 | 1771 – 26 February 1848 |
| Robert Michael Moor | 1994-03-10 | |
| Stephen Erwin Moorbath | 1977-03-17 | |
| Benjamin Moore | 1912-05-02 | 14 January 1867 – 3 March 1922 |
| Brian Cecil Joseph Moore | 2002-05-09 | Prof of Auditory Perception, Cambridge |
| Charles Moore | 1768-02-25 | c. 1722 – 18 May 1775 antiquary |
| Daniel Moore | 1810-06-28 | c. 1760 – 6 January 1828 barrister |
| Derek William Moore | 1990-03-15 | Prof of Maths, Imperial College |
| George Moore | 1835-04-02 | c. 1777 – 8 November 1859 |
| John Moore | 1715-11-10 | fl 1715–1734 |
| John Arthur Moore | 1846-02-26 | 1791 – 7 July 1860 Major, East India Co. |
| John Carrick Moore | 1856-06-05 | 14 February 1805 – 12 February 1898 |
| Michael Arthur Moore | 1989-03-16 | |
| Jonas Moore | 1680-03-12 | - ? 1681 Surveyor-general of Ordnance (son) |
| Jonas Moore | 1674-12-03 | 9 February 1617 – 25 August 1679 Surveyor-general of Ordnance (father) |
| Patrick Alfred Caldwell Moore | 2001-05-10 | 4 March 1923 – 9 December 2012 Honorary |
| Stephen Moore, 3rd Earl Mount Cashell | 1847-04-22 | 20 May 1792 – 10 October 1883 |
| Thomas Edward Lawes Moore | 1854-06-01 | 1819 – 1 May 1872 Naval (magnetic) surveyor |
| Patrick Alfred Pierce Moran | 1975-03-20 | 14 July 1917 – 19 September 1988 |
| Jean François Clement Morand | 1769-06-01 | 28 April 1726 – 13 August 1784 |
| Sauveur François Morand | 1729-01-09 | 2 April 1697 – 21 July 1773 |
| Robert Moray | 1660-11-28 | 1608 – 4 July 1673 |
| Henry Mordaunt, 2nd Earl of Peterborough | 1663-11-18 | ? October 1624 – 19 June 1697 |
| Thomas Osbert Mordaunt | 1796-04-14 | c. 1729 – 13 February 1809 Lt-General in Army |
| Louis Joel Mordell | 1924-05-15 | 28 January 1888 – 12 March 1972 |
| Henry More | 1664-05-25 | October 1614 – 1 September 1687 |
| Robert More | 1730-02-05 | 1703 – January 1780 Botanist |
| Cesar Moreau | 1827-02-08 | 1791 – 28 November 1861 |
| Thomas Morell | 1768-06-16 | 18 March 1703 – 19 February 1784 Garrison chaplain, Portsmouth, librettist |
| Henry John Reynolds Moreton, 3rd Earl of Ducie | 1855-02-22 | 25 June 1827 – 28 October 1921 |
| Thomas Reynolds-Moreton, 1st Earl of Ducie | 1814-06-09 | 31 August 1776 – 22 June 1840 |
| Giambattista Morgagni | 1722-11-30 | 26 February 1682 – ? 6 December 1771 |
| Anthony Morgan | 1663-05-20 | 1621 – c. November 1668 Original Soldier & MP |
| Arthur Morgan | 1835-04-02 | 1801 – 10 March 1870 Actuary |
| Campbell Greig De Morgan | 1861-06-06 | 22 November 1811 – 12 April 1876 |
| Charles Octavius Swinnerton Morgan | 1832-02-02 | 15 September 1803 – 5 August 1888 |
| Conwy Lloyd Morgan | 1899-06-01 | 7 February 1852 – 6 March 1936 |
| David Owen Morgan | 2012-04-19 | |
| John Morgan | 1765-03-07 | 10 June 1735 – 15 October 1789 |
| Michael John Morgan | 2005-05-26 | |
| Charles Morgan | 1816-05-30 | 5 February 1760 – 5 December 1846 |
| Gilbert Thomas Morgan | 1915-05-06 | 22 September 1870 – 1 February 1940 |
| Morien Bedford Morgan | 1972-03-16 | 20 December 1912 – 4 April 1978 |
| Walter Thomas James Morgan | 1949-03-17 | 5 October 1900 – 10 February 2003 |
| William Morgan | 1790-05-06 | June 1750 – 4 May 1833 |
| James Justinian Morier | 1819-02-04 | c. 1780 – 19 March 1849 |
| William Morison | 1842-03-03 | - 15 May 1851 |
| Benjamin Morland | 1707-03-12 | c. 1653 – 9 October 1733 Schoolmaster |
| Joseph Morland | 1703-11-30 | c. 1671–1716 Author & Physician |
| Samuel Morland | 1704-11-30 | - 1722 |
| Samuel Morland | 1722-05-24 | - 1734 |
| George Morley | 1666-11-28 | 27 Feb 1597 – 29 October 1684 |
| John Morley, 1st Viscount Morley of Blackburn | 1892-12-15 | 24 December 1838 – 23 September 1923 MP |
| Leslie Sydney Dennis Morley | 1992-03-12 | - 16 June 2011 |
| Lorenzo Morosini | 1763-03-10 | fl 1763 |
| Hervey Redmond Morres, 2nd Viscount Mountmorres | 1793-12-12 | c. 1746 – 18 August 1797 |
| Corbyn Morris | 1757-05-19 | - 24 December 1779 Commissioner of Customs |
| Edward Morris | 1812-06-18 | c. 1769 – 13 April 1815 MP for Newport, Cornwall |
| Gareth Alun Morris | 2014-04-30 | |
| George Paulet Morris | 1805-02-14 | c. 1760 – 17 September 1837 Physician |
| Howard Redfern Morris | 1988-03-17 | |
| John Carnac Morris | 1831-03-10 | 16 October 1798 – 2 August 1858 Civil Servant |
| John Gareth Morris | 1988-03-17 | |
| Matthew Robinson Morris, 2nd Baron Rokeby | 1746-11-27 | ? April 1713 – 30 November 1800 |
| Michael Morris | 1764-04-05 | - 1791 Army Physician |
| Richard Graham Michael Morris | 1997-05-15 | |
| Robert Hunter Morris | 1755-06-12 | c. 1700 – 27 January 1764 Governor of Pennsylvania |
| Peter John Morris | 1994-03-10 | |
| Russell Morris | 2016-04-29 | Materials chemist |
| William Richard Morris, Viscount Nuffield | 1939-06-08 | 11 October 1877 – 22 August 1963 Statute |
| Robert Morrison | 1825-05-12 | 5 January 1782 – 1 August 1834 |
| Henton Morrogh | 1964-03-19 | 29 September 1917 – 20 September 2003 |
| Leonard Morse | 1766-05-15 | - 31 January 1808 |
| Robert Morse | 1789-11-12 | 30 February 1743 – 28 January 1818 Military Engineer |
| Clifford Hiley Mortimer | 1958-03-20 | 27 February 1911 – 11 May 2010 Biologist, Wisconsin |
| Cromwell Mortimer | 1728-06-27 | c. 1699 – 7 January 1752 |
| John Mortimer | 1705-11-30 | c. 1656–1736 Author, Merchant, Agriculturalist |
| Charles Morton | 1752-01-16 | 1716 – 10 February 1799 |
| John Morton | 1703-11-30 | c. 1670 – 18 July 1726 Naturalist |
| John Morton | 2011-05-19 | Psychologist |
| Richard Alan Morton | 1950-03-16 | 22 September 1899 – 21 January 1977 Spectroscopist |
| Henry Moseley | 1839-02-07 | 9 July 1801 – 20 January 1872 |
| Henry Nottidge Moseley | 1877-06-07 | 14 November 1844 – 10 November 1891 |
| Charles Moss | 1752-05-28 | 1711 – 13 April 1802 |
| Joseph William Moss | 1830-02-18 | 1803 – 23 May 1862 |
| William Branks Motherwell | 2004-05-27 | Professor of Chemistry, University College |
| Basil Mott | 1932-05-05 | 16 September 1859 – 7 September 1938 |
| Frederick Walker Mott | 1896-06-04 | 23 October 1853 – 8 June 1926 |
| Nevill Francis Mott | 1936-05-07 | 30 September 1905 – 8 August 1996 |
| Allen Moulin | 1683-07-18 | c. 1653–1690 aka Mullen |
| Jacques du Moulin | 1667-12-05 | - c. 1686 |
| George Moult | 1689-11-30 | - 1727 |
| John Fletcher Moulton, Baron Moulton | 1880-06-03 | 18 November 1844 – 9 March 1921 |
| Pierre Moultou | 1780-04-27 | - 27 July 1821 |
| James Mounsey | 1750-03-08 | 1700 – 2 February 1773 |
| William Mountaine | 1751-03-14 | - 2 May 1779 |
| Louis Mountbatten, 1st Earl Mountbatten of Burma | 1966-05-19 | 26 June 1900 – 27 August 1979 Statute |
| Arthur Ernest Mourant | 1966-03-17 | 11 April 1904 – 29 August 1994 |
| Edward Richard Moxon | 2007-05-17 | |
| Joseph Moxon | 1678-11-30 | 8 August 1627 – 28 February 1691 |
| John Mudge | 1777-05-29 | 1721 – 26 March 1793 |
| Richard Zachary Mudge | 1822-12-05 | 6 September 1790 – 24 September 1854 |
| William Mudge | 1798-06-28 | 1 December 1762 – 17 April 1820 |
| Ferdinand Jacob Heinrich Mueller | 1861-06-06 | 30 June 1825 – 9 October 1896, botanist |
| Isabella Helen Mary Muir | 1977-03-17 | 20 August 1920 – 28 November 2005 |
| Robert Muir | 1911-05-04 | 5 July 1864 – 30 March 1959 |
| Thomas Muir | 1900-06-14 | 25 August 1844 – 21 March 1934 |
| Alexander Muirhead | 1904-05-05 | 26 May 1848 – 13 December 1920 |
| Gerhard Friedrich Muller | 1730-12-10 | 1705–1783 |
| Hugo Muller | 1866-06-07 | 29 July 1833 – 23 May 1915 |
| Benjamin von Munchausen | 1684-04-30 | fl 1684 |
| Jan de Munck | 1748-01-21 | fl 1748 |
| Nicholas Munckley | 1749-01-26 | c. 1721 – 20 February 1770 |
| Anthony John Mundella | 1882-03-09 | 28 March 1825 – 21 July 1897 |
| Sean Munro | 2011-05-19 | |
| Ludovico Antonio Muratori | 1717-11-14 | 21 October 1673 – 23 January 1750 |
| Charles Murchison | 1866-06-07 | 26 July 1830 – 23 April 1879 |
| Roderick Impey Murchison | 1826-04-06 | 20 February 1792 – 22 October 1871 |
| Patrick Murdoch | 1746-03-20 | - October 1774 |
| Thomas Murdoch | 1805-07-04 | 1758–1846 |
| Robert Murphy | 1834-06-05 | 1806 – 12 March 1843 |
| David William Murray, 3rd Earl of Mansfield | 1802-05-20 | 8 March 1777 – 18 February 1840 |
| David Murray, 4th Viscount Stormont | 1666-08-29 | - 24 July 1668 |
| George Murray | 1823-06-19 | 7 February 1772 – 28 July 1846 |
| George Robert Milne Murray | 1897-06-03 | 11 November 1858 – 16 December 1911 |
| James Murray | 1779-06-24 | c. 1722 – 19 April 1794 |
| James Alexander Murray | 1925-05-07 | 25 November 1873 – 20 November 1950 Director, Imp. Cancer Relief Fund |
| James Dickson Murray | 1985-03-21 | |
| James Murray, 1st Baron Glenlyon | 1818-04-09 | 29 May 1782 – 12 October 1837 |
| John Murray, 4th Duke of Atholl | 1780-11-09 | 30 June 1755 – 29 September 1830 |
| John Murray | 1896-06-04 | 3 March 1841 – 16 March 1914 |
| Kenneth Murray | 1979-03-15 | 30 December 1930 – 7 April 2013 |
| Mungo Murray | 1661-09-11 | 12 October 1599 – 1670 |
| Noreen Elizabeth Murray | 1982-03-18 | |
| Robin MacGregor Murray | 2010-05-20 | |
| John Norman Murrell | 1991-03-14 | 2 March 1932 - 25 January 2016 Theoretical chemist |
| Samuel Musgrave | 1760-06-12 | 29 September 1732 – 4 July 1780 |
| William Musgrave | 1774-03-17 | 8 October 1735 – 3 January 1800 Barrister |
| William Musgrave | 1684-03-19 | 4 November 1655 – ? December 1721 |
| William Musgrave | 1722-03-15 | c. 1696 – November 1724 Physician |
| Elon Musk | 2018-05-09 | 28 June 1971 |
| Pieter van Musschenbroek | 1734-11-14 | 14 March 1692 – 19 September 1761 |
| John Myddleton | 1739-03-08 | 1685 - 9 April 1747 |
| Charles Samuel Myers | 1915-05-06 | 13 March 1873 – 12 October 1946 |
| Robert Mylne | 1767-05-21 | 4 January 1734 – 5 May 1811 |
| Robert William Mylne | 1860-06-07 | 14 June 1817 – 2 July 1890 |
| William Chadwell Mylne | 1826-03-16 | ? 5 April 1781 – 25 December 1863 |
| John Mytton | 1767-02-26 | - 1769 |

### N

| Names | Election date | Notes |
| Frank Reginald Nunes Nabarro | 1971-03-18 | 7 March 1916 – 20 July 2006, British-South African physicist |
| Kiyoshi Nagai | 2000-05-11 | |
| Werner Nahm | 2011-05-19 | |
| Edward Nairne | 1776-06-20 | 1726 – 1 September 1806 |
| James H. Naismith | 2014-05-01 | Professor of Chemical Biology, University of St Andrews |
| William Naper | 1679-12-01 | - ? 1683 |
| Henry Edward Napier | 1820-05-18 | 5 March 1789 – 13 October 1853 |
| James Robert Napier | 1867-06-06 | 12 September 1821 – 13 December 1879 |
| Macvey Napier | 1817-06-12 | 12 April 1776 – 11 February 1847 |
| Robert Cornelis Napier, 1st Baron Napier of Magdala | 1869-12-16 | 6 December 1810 – 14 January 1890 |
| James Napier | 1775-03-30 | c. 1710 – 21 December 1799 Insp-Gen. of N.American hospitals |
| Roddam Narasimha | 1992-03-12 | |
| Mudumbai Seshachalu Narasimhan | 1996-03-14 | |
| Ramesh Narayan | 2006-05-18 | Prof of Astrophysics, Harvard-Smithsonian |
| Robert Nares | 1804-05-10 | 9 June 1753 – 23 March 1829 |
| George Strong Nares | 1875-06-03 | 24 April 1831 – 15 January 1915 |
| John Narrien | 1840-06-18 | 1782 – 30 March 1860 |
| Joseph Nash | 1778-04-09 | - 16 October 1782 |
| Kim Ashley Nasmyth | 1989-03-16 | |
| Sir James Naesmyth, Bt | 1767-02-12 | c. 1704 – 4 February 1779 MP Peeblesshire, botanist |
| Lorenz Natter | 1757-11-24 | 21 March 1705 – ? December 1763 |
| Philip Naude | 1738-02-23 | 18 October 1684 – 17 January 1745 |
| Louis Jouard de La Nauze | 1732-01-27 | 27 March 1696 – 2 May 1773 |
| George Nayler | 1826-06-01 | c. 1764 – 28 October 1831 |
| Thomas Neale | 1664-06-01 | ? October 1641 – December 1699 |
| Richard Neave | 1785-06-16 | 22 November 1731 – 28 January 1814 |
| Thomas Neave | 1814-05-05 | 11 November 1761 – 11 April 1848 |
| Caspar Needham | 1663-05-20 | c. 1622 – 31 October 1679 Original |
| Dorothy Mary Moyle Needham | 1948-03-18 | 22 September 1896 – 22 December 1987 |
| John Turberville Needham | 1747-01-22 | 10 September 1713 – 30 December 1781 |
| Joseph Needham | 1941-03-20 | 9 December 1900 – 25 March 1995 |
| Roger Michael Needham | 1985-03-21 | 10 February 1935 – 28 February 2003 Fellow 1985-03-21 |
| Walter Needham | 1667-06-20 | |
| Paul Neile | 1660-11-28 | ? May 1613 – ? January 1686 Founder |
| William Neile | 1663-05-20 | 7 December 1637 – 24 August 1670 Original |
| James Beaumont Neilson | 1846-01-15 | 22 June 1792 – 18 January 1865 |
| Arthur Charles Neish | 1971-03-18 | 4 July 1916 – 7 September 1973, Canadian plant biochemist |
| John Ashworth Nelder | 1981-03-19 | 8 October 1924 – 7 August 2010 Biomathematician, Rothamsted |
| Richard John Nelmes | 2003-05-15 | |
| Jenny K. Nelson | 2014-04-30 | |
| Robert Nelson | 1680-04-01 | 22 June 1656 – 16 January 1715 |
| Edward Nelthorpe | 1666-06-27 | ? 1604 – c. 1685 |
| Evan Nepean | 1820-05-04 | 1751 – 2 October 1822 |
| Robert Nesbitt | 1725-04-15 | c. 1697 – 27 May 1761 physician |
| Edward Nettleship | 1912-05-02 | 3 March 1845 – 30 October 1913 |
| Albert Neuberger | 1951-03-15 | 15 April 1908 – 14 August 1996, chemical pathologist |
| David Neuberger, Baron Neuberger of Abbotsbury | 2017-05-05 | Honorary fellow |
| Michael Samuel Neuberger | 1993-03-11 | biochemist |
| Bernhard Hermann Neumann | 1959-03-19 | 15 October 1909 – 21 October 2002 |
| Caspar Neumann | 1725-12-09 | 11 July 1683 – 20 October 1737 |
| Peter Le Neve | 1712-03-20 | ? January 1662 – 24 September 1729 |
| Edmund Neville Nevill | 1908-05-07 | 27 August 1849 – 14 January 1940 |
| Anne Neville | 2017-05-05 | |
| Francis Henry Neville | 1897-06-03 | 2 December 1847 – 5 June 1915 |
| Hugh Frank Newall | 1902-06-05 | 22 June 1857 – 22 February 1944 |
| Robert Stirling Newall | 1875-06-03 | 27 May 1812 – 21 April 1889 |
| Thomas John Newbold | 1842-01-06 | 9 February 1807 – 29 May 1850 |
| John Newburgh | 1664-11-02 | 1630–1692 |
| Peter Newcome | 1743-02-24 | - 1779 |
| John Newey | 1696-11-30 | 4 December 1664 – 13 September 1735 |
| Dudley Maurice Newitt | 1942-03-19 | 28 April 1894 – 14 March 1980 |
| Maxwell Herman Alexander Newman | 1939-03-16 | 8 February 1897 – 22 February 1984 |
| Ronald Charles Newman | 1998-05-14 | |
| William Newmarch | 1861-06-06 | 28 January 1820 – 23 March 1882 |
| George Newport | 1846-03-26 | 4 July 1803 – 7 April 1854 |
| John Michael Newsom-Davis | 1991-03-14 | |
| Robert Newstead | 1912-05-02 | 12 September 1859 – 17 February 1947 |
| Alfred Newton | 1870-06-02 | 11 June 1829 – 7 June 1907 |
| Edwin Tulley Newton | 1893-06-01 | 4 May 1840 – 28 January 1930 |
| Henry Newton | 1709-05-04 | 18 August 1651 – 29 July 1715 Advocate, Diplomat |
| Ian Newton | 1993-03-11 | |
| Isaac Newton | 1672-01-11 | 25 December 1642 – 20 March 1727, PRS 1703–1727, natural philosopher, mathematician, astronomer, physicist |
| William Nicholas | 1742-04-01 | - 1750 |
| Sir John Nicholl | 1806-03-20 | 16 March 1759 – 26 August 1838 |
| Whitlock Nicholl | 1830-02-18 | 1786 – 3 December 1838 |
| David G. Nicholls | 2019-04-16 | |
| Frank Nicholls | 1728-05-02 | 1699 – 7 January 1788 |
| John Nicholls | 1744-03-08 | ? 1710 – 11 January 1745 Merchant |
| John Graham Nicholls | 1988-03-17 | |
| Colin Nichols | 2014-04-30 | Biochemist, Washington University in St. Louis |
| Henry Nicholson | 1716-04-05 | c.1681 - 1733 Irish Physician |
| Henry Alleyne Nicholson | 1897-06-03 | 11 September 1844 – 19 January 1899 |
| John William Nicholson | 1917-05-03 | 1 November 1881 – ? 3 October 1955 |
| Robert Nicholson | 1807-06-04 | fl.1807 |
| Francis Nicholson | 1706-12-04 | 1660 – 5 March 1728 |
| Robin Buchanan Nicholson | 1978-03-16 | |
| Joseph Arthur Colin Nicol | 1967-03-16 | 5 December 1915 – 20 December 2004 |
| Antonio Nicolini, Marchese di Ponsacco | 1747-03-26 | 1700–1769 |
| Alexander Nicoll | 1826-02-23 | 3 April 1793 – 24 September 1828 |
| John Nicoll | 1765-02-28 | fl 1765 |
| William Nicolson | 1705-11-30 | 3 June 1655 – 14 February 1727 |
| James Nihill | 1742-04-01 | 1705 – 1 June 1759 |
| Robert Adam Nisbet-Hamilton | 1833-04-18 | - 9 June 1877 |
| Charles Niven | 1880-06-03 | 14 September 1845 – 11 May 1923 |
| William Davidson Niven | 1882-06-08 | 24 March 1842 – 29 March 1917 |
| Louis Jules Barbon Mancini Mazarini Nivernois | 1763-02-10 | 16 December 1716 – 98 |
| John Nixon | 1744-11-15 | - May 1777 |
| John Forster Nixon | 1994-03-10 | |
| Robert Nixon | 1801-06-11 | 1759 – 5 November 1837 Clergyman |
| Henry Minchin Noad | 1856-06-05 | 22 June 1815 – 23 July 1877 |
| Alison Noble | 2017-05-05 | |
| Denis Noble | 1979-03-15 | |
| Andrew Noble | 1870-06-02 | 13 September 1831 – 22 October 1915 |
| Stephen Robert Nockolds | 1959-03-19 | 11 May 1909 – 7 February 1990 |
| George Henry Noehden | 1820-05-04 | 23 January 1770 – 14 March 1826 |
| Henry Noel-Fearn | 1842-04-14 | 1811 – 11 March 1868 alias Henry Christmas, Clergyman |
| John Anthony Noguier | 1809-04-13 | fl.1809 |
| Frederick Nolan | 1833-02-07 | 9 February 1784 – 16 September 1864 Clergyman, theologian |
| Gustavus Adam Nolcken | 1777-05-08 | c. 1732 – 16 December 1812 |
| Jean Antoine Nollet | 1735-01-23 | 19 November 1700 – 24 April 1770 |
| John Mervin Nooth | 1774-03-03 | ? September 1737 – 3 May 1828 |
| Frederic Lewis Norden | 1741-01-08 | 22 October 1708 – 22 September 1742, Danish naval captain and explorer |
| Alfred Merle Norman | 1890-06-05 | 29 August 1831 – 26 October 1918 |
| Richard Oswald Chandler Norman | 1977-03-17 | 27 April 1932 – 6 June 1993 |
| Edward Norris | 1698-11-09 | 1663 – 22 July 1726 Physician |
| Ronald George Wreyford Norrish | 1936-05-07 | 9 November 1897 – 7 June 1978 |
| Frederick North, 5th Earl of Guilford | 1794-02-06 | 7 February 1766 – 14 October 1827 |
| George Augustus North, 3rd Earl of Guilford | 1782-01-17 | 11 September 1757 – 20 April 1802 |
| Richard Alan North | 1995-03-09 | |
| Ford North | 1900-06-21 | 10 January 1830 – 12 October 1913 |
| William North, 6th Baron North and 2nd Lord Grey | 1720-06-30 | 22 December 1678 – 31 October 1734 |
| Donald Henry Northcote | 1968-03-21 | 27 December 1921 – 8 January 2004 |
| Stafford Henry Northcote, 1st Earl of Iddesleigh and Viscount St Cyres | 1875-02-18 | 27 October 1818 – 12 January 1887 |
| Douglas Geoffrey Northcott | 1961-03-16 | 31 December 1916 – 8 April 2005 |
| William Northey | 1753-06-21 | 1721 – 24 December 1770 Commissioner & MP gor Calne, Maidstone & Bedwin |
| Fletcher Norton, 1st Baron Grantley | 1776-04-18 | 23 June 1716 – 1 January 1789 |
| Gustav Joseph Victor Nossal | 1982-03-18 | biologist |
| Thomas Nott | 1663-05-20 | ? December 1606 – 18 December 1681 Original |
| Edward Nourse | 1728-10-24 | 1701 – 13 May 1761 Surgeon |
| Thomas Novell | 1681-04-06 | - 1686 |
| Konstantin Sergeevich Novoselov | 2011-05-19 | aka Kostya Novoselov |
| Christopher Nugent | 1768-04-14 | - 12 October 1775 Physician |
| Paul Maxime Nurse | 1989-03-16 | |
| Phillip Sadler Nutman | 1968-03-21 | 10 October 1914 – 5 May 2004 |
| George Henry Falkiner Nuttall | 1904-05-05 | 5 July 1862 – 16 December 1937 |
| John Frederick Nye | 1976-03-18 | |
| Peter Hague Nye | 1987-03-19 | 16 September 1921 – 13 February 2009 Soil Chemist |
| Ronald Sydney Nyholm | 1958-03-20 | 29 January 1917 – 4 December 1971 |

### O

| Name | Election date | Notes |
| Lucius Henry O'Brien | 1773-05-27 | 1731 – 15 January 1795 |
| Paul O'Brien | 2013-05-02 | |
| Anne O'Garra | 2008-05-16 | |
| James O'Hara, 2nd Baron Tyrawley | 1748-01-07 | 1690 – 14 July 1773 |
| Michael John O'Hara | 1981-03-19 | |
| Peter O'Hearn | 2018-05-09 | 13 July 1963 – |
| John Michael O'Keefe | 1992-03-12 | Cognitive neuroscientist |
| Hugh O'Neill | 2012-04-19 | Experimental Petrologist/Thermodynamicist |
| Luke O'Neill | 2016-04-29 | Biochemist |
| Robert Keith O'Nions | 1983-03-17 | |
| William Brooke O'Shaughnessy | 1843-03-16 | October 1809 – 10 January 1889 |
| Cornelius O'Sullivan | 1885-06-04 | 20 December 1841 – 8 January 1907 |
| Sylvia Onora O'Niell, Baroness O’Neill of Bengarve | 2007-05-17 | Honorary |
| Stephen Patrick O’Rahilly | 2003-05-15 | |
| Charles Henry Oakes | 1835-04-02 | 25 November 1810 – 16 May 1864 |
| Cyril Leslie Oakley | 1957-03-21 | 20 June 1907 – 27 March 1975 |
| Charles William Oatley | 1969-03-20 | 15 February 1904 – 11 March 1996 |
| John Richard Ockendon | 1999-05-13 | |
| William Odling | 1859-06-09 | 5 September 1829 – 17 February 1921 Prof of Chemistry, Guy's Hospital |
| Albert Cyril Offord | 1952-03-20 | 9 June 1906 – 4 June 2000 |
| Raymond William Ogden | 2006-05-18 | |
| Bridget Margaret Ogilvie | 2003-05-15 | |
| James Ogilvy, 1st Earl of Seafield and 4th Earl of Findlater | 1698-11-09 | 11 July 1663 – 15 August 1730 |
| James Adey Ogle | 1826-02-02 | 22 October 1792 – 25 September 1857 |
| James Edward Oglethorpe | 1749-11-09 | 22 December 1696 – 1 July 1785 |
| Alexander George Ogston | 1955-03-17 | 30 January 1911 – 29 June 1996 |
| Takeshi Oka | 1984-03-15 | |
| Heinrich Wilhelm Matthäus Olbers | 1804-04-12 | 11 October 1758 – 2 March 1840 |
| Henry Oldenburg | 1663-04-22 | c. 1617 – ? September 1677 Original |
| John Oldershaw | 1786-11-16 | 27 May 1754 – 31 January 1847 |
| Richard Dixon Oldham | 1911-05-04 | 31 July 1858 – 15 July 1936 |
| Thomas Oldham | 1848-06-09 | 4 May 1816 – 17 July 1878 |
| Charles Oliphant | 1713-06-11 | c. 1666–1720 |
| Marcus Laurence Elwin Oliphant | 1937-05-06 | 8 October 1901 – 14 July 2000 |
| David Ian Olive | 1987-03-19 | |
| Benjamin Oliveira | 1835-06-04 | c. 1807 – 28 September 1865 |
| Daniel Oliver | 1863-06-04 | 7 February 1830 – 21 December 1916 |
| Francis Wall Oliver | 1905-05-11 | 10 May 1864 – 14 September 1951 |
| William Oliver | 1730-01-22 | 4 August 1695 – 17 March 1764 |
| William Oliver | 1703-11-30 | 1659 – 4 April 1716 Army Physician |
| William David Ollis | 1972-03-16 | 22 December 1924 – 13 June 1999 |
| Erasmus Ommanney | 1868-06-04 | 22 May 1814 – 21 December 1904 |
| Charles Savill Onley | 1819-02-18 | ? 1757 – 31 August 1843 |
| Edward Onslow | 1780-01-27 | 9 April 1758 – 18 October 1829 |
| Sir Henry John Oram | 1912-05-02 | 19 June 1858 – 5 May 1939 |
| Craven Ord | 1787-05-03 | 1756 – ? January 1832 |
| John Ord | 1780-06-01 | c. 1729 – 6 June 1814 |
| Ralph Ord | 1723-11-30 | - 1724 |
| Robert Ord | 1724-03-12 | - ? 12 February 1778 |
| Christine Anne Orengo | 2019-04-16 | 22 June 1955 – |
| Leslie Eleazer Orgel | 1962-03-15 | 12 January 1927 - 27 October 2007 |
| Barnaba Oriani | 1795-04-16 | 17 July 1752 – 12 November 1832 |
| Louis Philippe Albert d'Orleans, Count of Paris | 1865-04-27 | 24 August 1838 – 8 September 1894 |
| Edward Latham Ormerod | 1872-06-06 | 27 August 1819 – 18 March 1873 Physician & Entomologist |
| George Ormerod | 1819-02-25 | 20 October 1785 – 9 October 1873 |
| H. Alexander Ormsby | 1839-04-11 | fl 1839 |
| Egon Orowan | 1947-03-20 | 2 August 1902 – 3 August 1989 |
| William McFadden Orr | 1909-05-06 | 2 May 1866 – 14 August 1934 |
| Andrew Orr-Ewing | 2017-05-05 | |
| Giovanni Giuseppe, Marquis Orsi | 1716-11-30 | 19 June 1652 – 21 December 1733 |
| Casimiro Gómez Ortega | 1777-06-05 | 4 March 1740 – 30 August 1818 |
| Jose Arcadio de Ortega | 1753-03-08 | - 1761 |
| James Herbert Orton | 1948-03-18 | 12 March 1884 – 2 February 1953 |
| Kennedy Joseph Previté Orton | 1921-05-12 | 21 January 1872 – 16 March 1930 |
| Jean Jacques d'Ortous de Mairan | 1735-01-23 | 27 November 1678 – 20 February 1771 |
| John Osborn | 1777-04-17 | 16 July 1743 – 12 January 1814 Diplomat |
| Sherard Osborn | 1870-06-02 | 25 April 1822 – 6 May 1875 |
| Francis Osborne, 5th Duke of Leeds | 1773-04-01 | 29 January 1751 – 31 January 1799 |
| Thomas Osborne, 4th Duke of Leeds | 1739-12-20 | 6 November 1713 – 23 March 1789 |
| Anne Elisabeth Osbourn | 2019-04-16 | |
| Oscar I, King of Sweden and Norway | 1826-12-21 | 4 July 1799 – 8 July 1859 Royal |
| Abraham Follett Osler | 1855-06-07 | 22 March 1808 – 26 April 1903 |
| William Osler | 1898-06-09 | 12 July 1849 – 29 December 1919 |
| Charles Barry Osmond | 1984-03-15 | |
| Il Cavaliere Osorio | 1748-04-21 | fl 1748 |
| Ronald Harry Ottewill | 1982-03-18 | |
| Alexander Ouchterlony | 1734-03-07 | - 13 April 1758 |
| Nicholas Oudart | 1667-11-21 | - December 1681 |
| Gore Ouseley | 1817-12-18 | 24 June 1770 – 18 November 1844 |
| Benjamin Fonseca Outram | 1838-05-03 | 1775 – 16 February 1856 |
| David J. Owen [Wikidata] | 2017-05-05 | |
| David Roger Jones Owen [pt] | 2009 | |
| Henry Owen | 1755-06-12 | 1716 – 14 October 1795 |
| John Joseph Thomas Owen | 1988-03-17 | |
| Paul Robert Owen | 1971-03-18 | 24 January 1920 – 11 November 1990 |
| Richard Owen | 1834-12-18 | 20 July 1804 – 18 December 1892 |
| Ernest Ronald Oxburgh, Baron Oxburgh of Liverpool in the County of Merseyside | 1978-03-16 | |
| George D'Oyly | 1815-03-16 | 31 October 1778 – 8 January 1846 Clergyman |

## Foreign members
### M

| Names | Election date | Notes |
| Heinrich Gustav Magnus | 1863-04-30 | 2 May 1802 – 4 April 1870 |
| Ho-kwang (David) Mao | 2008-05-16 | |
| Rudolph Arthur Marcus | 1987-06-25 | Canadian-born U.S. chemist, Nobel Prize (1992) |
| Emmanuel Marie Pierre Martin Jacquin de Margerie | 1931-06-25 | 11 November 1862 – ? 20 December 1953 |
| Jean Charles Galissard de Marignac | 1881-05-12 | 24 April 1817 – 15 April 1894 |
| Hubert Simon Markl | 2002-05-09 | |
| Peter Robert Marler | 2008-05-16 | |
| Gail Roberta Martin | 2015 | 1944 - American biologist |
| Carl Friedrich Philipp von Martius | 1838-12-20 | 17 April 1794 – 13 December 1868 |
| Eleuthere Elie Nicolas Mascart | 1892-05-19 | 21 February 1837 – ? 24 August 1908 |
| Ernst Mayr | 1988-06-30 | 5 July 1904 – 3 January 2005 |
| Barbara McClintock | 1989-06-29 | 16 June 1902 – 2 September 1992 |
| Elmer Verner McCollum | 1961-04-27 | 3 March 1879 – 15 November 1967 |
| Hugh O'Neill McDevitt | 1994-06-09 | |
| Marcia McNutt | 2017-05-05 | |
| Johann Friedrich Meckel | 1833-06-06 | ? 17 October 1781 – 31 October 1833 |
| Lise Meitner | 1955-04-28 | 7 November 1878 – 27 October 1968, Austrian-born Swedish physicist nuclear fission |
| Macedonio Melloni | 1839-05-30 | 11 April 1798 – 11 August 1854 |
| Dmitri Ivanovich Mendeleeff | 1892-05-19 | ? 7 February 1834 – 2 February 1907 Foreign Member |
| Matthew Stanley Meselson | 1984-06-28 | U.S. molecular biologist |
| Elias Metchnikoff | 1895-12-12 | ? 15 May 1845 – 15 July 1916, aka Ilya Ilyich Mechnikov, Ukrainian-born Russian French scientist, Nobel Prize for Medicine (1908) |
| Otto Fritz Meyerhof | 1937-06-17 | 12 April 1884 – 6 October 1951, German-born U.S. scientist, Nobel Prize (1922) |
| Elliot Martin Meyerowitz | 2004-05-27 | U.S. plant biologist |
| Hartmut Michel | 2005-05-26 | |
| Albert A. Michelson | 1902-11-27 | 19 December 1852 – 9 May 1931, Polish-born U.S. physicist, Nobel Prize (1907) |
| William Hughes Miller | 2015 | 16/03/41 - American chemist |
| Henri Milne-Edwards | 1848-03-30 | 23 October 1800 – 29 July 1885 |
| Charles-François Brisseau de Mirbel | 1837-04-27 | 27 March 1776 – 12 September 1854 |
| Silas Weir Mitchell | 1908-06-04 | 16 February 1829 – 4 January 1914 |
| Eilhard Mitscherlich | 1828-05-15 | 7 January 1794 – ? 28 August 1863 |
| Gösta Mittag-Leffler | 1896-11-26 | 16 March 1846 – 7 July 1927 |
| Hugo von Mohl | 1868-03-26 | 8 April 1805 – 1 April 1872 |
| Henri Moissan | 1905-05-11 | 28 September 1852 – 20 February 1907, French chemist, artificial diamonds, Nobel Prize (1906) |
| Jacques Lucien Monod | 1968-04-25 | 10 February 1910 – 31 May 1976 |
| Ginés Morata | 2017-05-05 | 19 April 1945 – Spanish biologist |
| Thomas Hunt Morgan | 1919-06-26 | 25 September 1866 – 4 December 1945 |
| Domenico Pini Morichini | 1827-03-08 | 23 September 1773 – 19 November 1836 |
| Kurt Albin Mothes [de; ru] | 1971-04-22 | 3 November 1900 – 12 February 1983 |
| Vernon Benjamin Mountcastle | 1996-03-14 | |
| Hermann Joseph Muller | 1953-04-23 | 21 December 1890 – 5 April 1967 |
| Johannes Muller | 1840-06-04 | 14 July 1801 – 28 April 1858 |
| Robert Sanderson Mulliken | 1967-04-20 | 7 June 1896 – 31 October 1986 |
| David Mumford | 2008-05-16 | |
| Walter Heinrich Munk | 1976-04-08 | 19 October 1917 – 8 February 2019, Austrian-born U.S. geophysicist |

### N

| Name | Election date | Notes |
| Carl Wilhelm von Nägeli | 1881-05-12 | 27 March 1817 – ? 11 May 1891 |
| Louis Eugène Félix Néel | 1966-04-21 | 22 November 1904 – 14 November 2000 |
| Erwin Neher | 1994-06-09 | |
| Hermann Walther Nernst | 1932-06-02 | 25 June 1864 – ? 19 November 1941 |
| Aleksandr Nikolaevich Nesmeyanov | 1961-04-27 | 9 September 1899 – 17 January 1980 |
| Franz Ernst Neumann | 1862-06-19 | 11 September 1798 – 23 May 1895 |
| Georg Balthasar von Neumayer | 1899-06-01 | 21 June 1826 – 25 May 1909 |
| Simon Newcomb | 1877-12-13 | 12 March 1835 – 11 July 1909 |
| Hubert Anson Newton | 1892-05-19 | 19 March 1830 – 12 August 1896 |
| Jerzy Neyman | 1979-04-26 | 16 April 1894 – 5 August 1981 |
| Kyriacos Costa Nicolaou | 2013-05-02 | |
| Yasutomi Nishizuka | 1990-06-28 | 12 July 1932 – 4 November 2004 |
| Niels Erik Nørlund | 1938-05-19 | 26 October 1885 – 4 July 1981 |
| Ryōji Noyori | 2005-05-26 | |
| Shosaku Numa | 1986-06-26 | 8 February 1929 – 15 February 1992 |
| Christiane Nüsslein-Volhard | 1990-06-28 | |

### O

| Name | Election date | Notes |
| Giuseppe Paolo Stanislao Occhialini | 1974-04-25 | 1907 – 30 December 1993 |
| Severo Ochoa | 1965-04-08 | 24 September 1905 – 1 November 1993 |
| Hans Christian Ørsted | 1821-04-12 | 14 August 1777 – 9 March 1851 |
| Georg Simon Ohm | 1842-05-05 | ? 16 March 1787 – ? 7 July 1854 |
| George Olah | 1997 | Hungarian-born U.S. chemist, Nobel Prize (1994) |
| Jean Baptiste Julien d'Omalius d'Halloy | 1873-11-27 | 17 February 1783 – 15 January 1875 Foreign Member |
| Heike Kamerlingh Onnes | 1916-03-23 | 22 September 1853 – 21 February 1926 Foreign Member |
| Lars Onsager | 1975-04-24 | 27 November 1903 – 5 October 1976 |
| Jan Hendrik Oort | 1959-04-23 | 28 April 1900 – 5 November 1992 |
| J. Robert Oppenheimer | 1962-05-03 | 23 April 1904 – 18 February 1967 Foreign Member, U.S. Physicist |
| Henry Fairfield Osborn | 1926-04-29 | 8 August 1857 – 6 November 1935 |
| Jeremiah Ostriker | 2007-05-17 | |