| Name | Election date | Notes |
|---|
| Daniel Ernest Jablonski | 11 June 1713 | 20 November 1660 – 25 May 1741, German theologian, and reformer |
| James Julian Bennett Jack | 15 May 1997 | |
| Kenneth Henderson Jack | 20 March 1980 | 12 October 1918 – 28 January 2013 |
| Sir David Jack | 12 March 1992 | 22 February 1924 – 8 November 2011 Pharmacologist, Glaxo |
| Cyril Jackson | 16 January 1772 | 1746 – 31 August 1819 |
| Derek Ainslie Jackson | 20 March 1947 | 23 June 1906 – 20 February 1982 |
| Henry Bradwardine Jackson | 6 June 1901 | 21 January 1855 – 14 December 1929 |
| Herbert Jackson | 3 May 1917 | 17 March 1863 – 10 December 1936 Chemist |
| Humphry Jackson | 19 November 1772 | 1717 – ? 29 June 1801 Chemist |
| James Anthony Jackson | 9 May 2002 | |
| John Jackson | 17 March 1938 | 12 February 1887 – 9 December 1958 |
| John Jackson | 30 November 1694 | c. 1672–1724 |
| John Hughlings Jackson | 6 June 1878 | 4 April 1835 – 7 October 1911 |
| Julian Jackson | 3 April 1845 | 30 March 1790 – 16 March 1853 Colonel (Russian Army) and geographer |
| Richard James Jackson | 18 May 2006 | |
| Roy Jackson | 11 May 2000 | Prof. of Chem. Eng., Princeton. |
| Samuel Jackson | 8 November 1798 | fl 1798 surgeon |
| 16 May 2008 | Professor of Biology, Cambridge |
| William Lawies Jackson, 1st Baron Allerton | 5 February 1891 | 17 February 1840 – 4 April 1917 |
| Willis Jackson, Baron Jackson of Burnley | 19 March 1953 | 30 October 1904 – 17 February 1970 Fellow 19 March 1953 |
| William Jacob | 23 April 1807 | c. 1762 – ? 17 December 1851 |
| Joannes Adolphus Jacobaeus | 25 June 1724 | 21 May 1698 – 3 August 1772 Professor of Medicine |
| Patricia Ann Jacobs | 11 March 1993 | geneticist. |
| Theodore Jacobsen | 22 June 1727 | - 25 April 1772 |
| Francis Jacquier | 10 December 1741 | 7 June 1711 – 3 July 1788 |
| Nicolas Joseph Jacquin | 3 April 1788 | 17 February 1727 – ? 24 October 1817 |
| John Conrad Jaeger | 19 March 1970 | 30 July 1907 – 15 May 1979 |
| James Jago | 2 June 1870 | 18 December 1815 – 18 January 1893 |
| Eric Jakeman | 15 March 1990 | |
| Jean Jallabert | 13 November 1740 | 26 July 1712 – 11 March 1768 |
| James II, King of Great Britain and Ireland | 9 January 1665 | 14 October 1633 – 6 September 1701 |
| Anthony Trafford James | 17 March 1983 | 6 March 1922 – 7 December 2006 |
| Henry James | 9 June 1848 | 8 June 1803 – 14 June 1877 |
| Ioan Mackenzie James | 21 March 1968 | |
| Michael Norman George James | 16 March 1989 | |
| Reginald William James | 17 March 1955 | 9 January 1891 – 7 July 1964 |
| Sydney Price James | 7 May 1931 | 17 September 1870 – 17 April 1946 Army physician |
| William James | 30 March 1775 | c. 1721 – 16 December 1783 |
| William James | 9 April 1767 | - 11 December 1786 |
| William Owen James | 20 March 1952 | 21 May 1900 – 15 September 1978 Botanist, Oxford University |
| Guy Antony Jameson | 9 March 1995 | |
| Graeme Jameson | 2018-05-09 | 1936 |
| Robert Jameson | 25 May 1826 | 11 July 1774 – 19 April 1854 |
| Robin Ralph Jamison | 20 March 1969 | 12 July 1912 – 18 March 1991 |
| Francis Robert Japp | 4 June 1885 | 9 February 1848 – 1 August 1925 |
| William Jardine | 7 June 1860 | 24 February 1800 – 21 November 1874 |
| William Fleming Hoggan Jarrett | 20 March 1980 | 2 January 1927 – 27 August 2011 |
| Paul Gordon Jarvis | 15 May 1997 | 23 May 1935 – 5 February 2013 |
| Jacobus Jattica | 12 February 1736 | fl 1736 |
| Louis de Jaucourt | 8 January 1756 | 27 September 1704 – 3 February 1780 |
| James Hopwood Jeans | 3 May 1906 | 11 September 1877 – 16 September 1946 |
| John Jebb | 18 February 1779 | 17 February 1736 – 2 March 1786 |
| John Jebb | 26 February 1824 | 27 September 1775 – 9 December 1833 |
| Richard Jebb | 28 March 1765 | ? October 1729 – 4 July 1787 physician |
| Geoffrey Jefferson | 20 March 1947 | 10 April 1886 – 29 January 1961 |
| George Barker Jeffery | 6 May 1926 | 9 May 1891 – 27 April 1956 |
| Henry Martyn Jeffery | 3 June 1880 | 5 January 1826 – 3 November 1891 |
| Edward Jeffreys | 28 October 1669 | fl 1655–1702 |
| Alec John Jeffreys | 20 March 1986 | |
| Harold Jeffreys | 7 May 1925 | 22 April 1891 – 18 March 1989 |
| John Jeffreys | 12 May 1726 | - 20 July 1741 |
| John Gwyn Jeffreys | 2 April 1840 | 18 January 1809 – 24 January 1885 |
| Julius Jeffreys | 7 January 1841 | ? 1801 – 13 May 1877 |
| Walter Jeffreys | 14 November 1717 | fl 1717–1753 |
| Joseph Jekyll | 3 June 1790 | 1 January 1754 – 8 March 1837 Barrister & MP |
| Joseph Jekyll | 5 June 1834 | 23 September 1802 – 23 November 1841 Son of above. |
| George Patrick John Rushworth Jellicoe, 2nd Earl Jellicoe | 28 June 1990 | 5 April 1918 – 22 February 2007 |
| Henry Jenkes | 30 November 1674 | - August 1697 |
| Charles Frewen Jenkin | 7 May 1931 | 24 September 1865 – 23 August 1940 |
| Henry Charles Fleeming Jenkin | 1 June 1865 | 25 March 1833 – 12 June 1885 |
| Richard Jenkins | 18 February 1841 | 19 February 1785 – 30 December 1853 Civil Servant & MP of Shrewsbury |
| David Stewart Jenkinson | 14 March 1991 | 25 February 1928 – 16 February 2011 Soil Scientist Rothamsted |
| Robert Banks Jenkinson, 2nd Earl of Liverpool | 22 May 1794 | 7 June 1770 – 4 December 1828 |
| Edward Jenner | 26 February 1789 | 17 May 1749 – 26 January 1823 |
| William Jenner | 2 June 1864 | 30 January 1815 – 11 December 1898 |
| John Jennings | 18 November 1779 | fl 1779 |
| Philip Jennings | 1 March 1821 | c. 1783 – 20 December 1849 |
| Niels Kaj Jerne | 20 March 1980 | 23 December 1911 – 7 October 1994 |
| John Jervis, 1st Earl of St Vincent | 21 December 1809 | 9 January 1735 – 14 March 1823 |
| Thomas Best Jervis | 15 March 1838 | 2 August 1794 – 3 April 1857 |
| William Francis Drummond Jervois | 7 June 1888 | 10 September 1821 – 16 August 1897 |
| John Jesse | 5 May 1842 | 6 January 1801 – 26 September 1863 Amateur naturalist of Llanbedr Hall, Wales. |
| George Jessel | 25 November 1880 | 14 February 1824 – 21 March 1883, Solicitor General (1871–1873) |
| Thomas Michael Jessell | 14 March 1996 | |
| Thomas Jett | 30 November 1714 | - 1 July 1730 Barrister |
| William Stanley Jevons | 6 June 1872 | 1 September 1835 – 13 August 1882 |
| Harren Jhoti | 2018-05-09 | 1962 – |
| John Leonard Jinks | 19 March 1970 | 21 October 1929 – 6 June 1987 |
| Joao, Duke of Braganza | 17 November 1757 | 1719–1806 |
| Richard Paul Jodrell | 9 January 1772 | 13 November 1745 – 26 January 1831 |
| Paul Jodrell | 15 November 1781 | 12 November 1746 – 6 August 1803 |
| Archduke John of Austria | 8 February 1816 | 1782–1859 Royal |
| Alan Woodworth Johnson | 18 March 1965 | 29 September 1917 – 5 December 1982 Chemist |
| Barry Edward Johnson | 16 March 1978 | 1 August 1937 – 5 May 2002 Mathematician |
| Brian Frederick Gilbert Johnson | 14 March 1991 | |
| Cuthbert William Johnson | 10 March 1842 | 21 September 1799 – 8 March 1878 Barrister |
| Edward John Johnson | 10 March 1836 | ? 1795 – 7 February 1853 |
| George Johnson | 6 June 1872 | 29 November 1818 – 3 June 1896 Physician |
| George Henry Sacheverell Johnson | 18 January 1838 | 1808 – 4 November 1881 Mathematician |
| James Rawlins Johnson | 26 June 1817 | - 1840 Physician |
| Kenneth Langstreth Johnson | 18 March 1982 | |
| Louise Napier Johnson | 15 March 1990 | |
| Manuel John Johnson | 5 June 1856 | 23 May 1805 – 28 February 1859 |
| 30 April 2014 | Physiologist, Cambridge University |
| Percival Norton Johnson | 30 April 1846 | 1793 – 1 June 1866 |
| Robert Augustus Johnson | 17 April 1788 | 1745 – 9 January 1799 |
| William Johnson | 18 March 1982 | 20 April 1922 – 13 June 2010 Prof. of Mech Eng, Cambridge Univ. |
| Philip Nicholas Johnson-Laird | 14 March 1991 | |
| Alexander Johnston | 22 November 1810 | 25 April 1775 – 6 March 1849 |
| James Finlay Weir Johnston | 15 June 1837 | 13 September 1796 – 18 September 1855 |
| John Johnstone | 18 March 1813 | 1768 – 28 December 1836 physician |
| Charles Jasper Joly | 5 May 1904 | 27 June 1864 – 4 January 1906 |
| John Joly | 2 June 1892 | 1 November 1857 – 8 December 1933 |
| Bennett Melvill Jones | 16 March 1939 | 28 January 1887 – 31 October 1975 Prof. of Aeronautical Eng., Cambridge Univ. |
| Charles Handfield Jones | 6 June 1850 | 1 October 1819 – 30 September 1890 physician |
| Douglas Samuel Jones | 21 March 1968 | 10 January 1922 – 27 November 2013 Mathematician |
| E. Yvonne Jones | 2017-05-05 | |
| Ewart Ray Herbert Jones | 16 March 1950 | 16 March 1911 – 7 May 2002 |
| Francis Edgar Jones | 16 March 1967 | 16 January 1914 – 10 April 1988 electronics, co-developed "Oboe" |
| Frederic Wood Jones | 7 May 1925 | 23 January 1879 – 29 September 1954 |
| Geoffrey Melvill Jones | 15 March 1979 | |
| Harry Jones | 20 March 1952 | 12 April 1905 – 15 December 1986 Prof of Mathematics |
| Henry Jones | 27 June 1723 | - January 1727 |
| Henry Bence Jones | 30 April 1846 | 31 December 1813 – 20 April 1873 |
| Humphrey Owen Jones | 2 May 1912 | 20 February 1878 – 12 August 1912 |
| John Kenyon Netherton Jones | 21 March 1957 | 28 January 1912 – 13 April 1977 chemist, Bristol University |
| John Viriamu Jones | 7 June 1894 | 2 January 1856 – 2 June 1901 |
| Jonathan Dallas George Jones | 15 May 2003 | |
| Owen Thomas Jones | 6 May 1926 | 16 April 1878 – 5 May 1967 |
| Reginald Victor Jones | 18 March 1965 | 29 September 1911 – 17 December 1997 |
| Richard Anthony Lewis Jones | 18 May 2006 | |
| Richard Jones, 1st Earl of Ranelagh | 20 May 1663 | 9 February 1641 – 5 January 1712 Original Fellow |
| Roger Jones | 18 March 1736 | - 1748 Physician & Natural Historian |
| Steve Jones | 2012 | 24 March 1944 - |
| Thomas Jones | 4 June 1835 | 24 June 1775 – 29 July 1852 Optician |
| Thomas Alwyn Jones | 12 March 1992 | |
| Thomas Rupert Jones | 6 June 1872 | 1 October 1819 – 13 April 1911 Physician & Prof of Geology |
| Thomas Rymer Jones | 21 March 1844 | 20 March 1810 – 10 December 1880 Prof of Physiology, London |
| Thomas Tyrwhitt Jones | 9 January 1800 | 1765 – 26 November 1811 MP |
| Thomas Wharton Jones | 30 April 1840 | 9 January 1808 – ? 7 November 1891 Surgeon |
| Vaughan Frederick Randal Jones | 15 March 1990 | |
| William Jones | 30 November 1711 | 1675 – ? 1 July 1749 |
| William Jones | 30 April 1772 | 28 September 1746 – 27 April 1794 |
| William Jones | 22 June 1775 | 30 July 1726 – 6 January 1800 |
| Carole Jordan | 15 March 1990 | astrophysicist |
| Gibbes Walker Jordan | 29 May 1800 | c. 1757 – 16 February 1823 barrister |
| Heinrich Ernst Karl Jordan | 5 May 1932 | 7 December 1861 – 12 January 1959 |
| John Philip Jordis | 27 April 1681 | fl 1681–1715 |
| Brian David Josephson | 19 March 1970 | physicist, Nobel Prize (1973) |
| James Prescott Joule | 6 June 1850 | 24 December 1818 – 11 October 1889 |
| Bruce Arthur Joyce | 11 May 2000 | |
| Dominic Joyce | 2012 | |
| Charles Joye | 17 November 1748 | ? 1719 – ? April 1776 |
| Richard Jozsa | 2019-04-16 | 13 November 1953 – |
| Jorge Juan y Santacilia | 9 November 1749 | ? 5 January 1713 – ? 21 June 1773 |
| John Wesley Judd | 7 June 1877 | 19 February 1840 – 3 March 1916 |
| Alfred John Jukes-Browne | 6 May 1909 | 16 April 1851 – 14 August 1914 |
| Joseph Beete Jukes | 2 June 1853 | 10 October 1811 – 29 July 1869 |
| Calestous Juma | 18 May 2006 | |
| James Jurin | 1 April 1756 | c. 1731 – 3 July 1762 Commissioner for Peace, Northumberland |
| James Jurin | 14 November 1717 | ? December 1684 – 29 March 1750 |
| Antoine de Jussieu | 11 December 1718 | 6 July 1686 – 22 April 1758 |
| Bernard de Jussieu | 22 June 1727 | 17 August 1699 – 6 November 1777 |
| John Obadiah Justamond | 14 December 1775 | 14 October 1737 – 27 March 1786 Surgeon |
| Henry Justel | 7 December 1681 | 1620 – ? 24 September 1693 |
| James Justice | 22 October 1730 | fl 1730–1757 Horticulturalist | |
| Name | Election date | Notes |
|---|
| Alejandro Kacelnik | 2011-05-19 | |
| Franz Daniel Kahn | 11 March 1993 | 14 May 1926 – ? 8 February 1998 |
| 16 May 2008 | |
| George Ernest Kalmus | 17 March 1988 | |
| Sophien Kamoun | 2018-05-09 | 8 December 1965 – |
| Yuet Wai Kan | 19 March 1981 | |
| Robert John Kane | 7 June 1849 | 25 September 1809 – 16 February 1890 |
| Gagandeep Kang | 2019-04-16 | 3 November 1962 – |
| Charles Kuen Kao | 15 May 1997 | |
| Piotr Leonidovich Kapitza | 2 May 1929 | 26 June 1894 – 8 April 1984 |
| Jack Henri Kaplan | 9 March 1995 | |
| Victoria Michelle Kaspi | 2010-05-20 | |
| Basil Kassanis | 17 March 1966 | 16 October 1911 – 23 March 1985 |
| Abraham Gotthelf Kastner | 30 April 1789 | 27 September 1719 – 20 June 1800 |
| Edward Kater | 19 November 1840 | 1816 – 6 July 1866 |
| Henry Kater | 15 December 1814 | 16 April 1777 – 26 April 1835 |
| Alan Roy Katritzky | 20 March 1980 | |
| Bernard Katz | 20 March 1952 | 26 March 1911 – 20 April 2003, Nobel Prize for Medicine (1970) |
| Herbert Davenport Kay | 22 March 1945 | 9 September 1893 – 24 November 1976 |
| Joseph Henry Kay | 26 February 1846 | 1814 – 17 July 1875 |
| Lewis Edward Kay | 2010-05-20 | |
| Steve A. Kay | 2019-04-16 | 4 October 1959 – |
| George William Clarkson Kaye | 16 March 1939 | 8 April 1880 – 16 April 1941 physicist,radiologist |
| John Kaye | 7 March 1811 | 28 December 1783 – 18 February 1853 |
| John William Kaye | 7 June 1866 | 1814 – 24 July 1876 |
| Richard Kaye | 5 December 1765 | 1736–1809 Clergyman, York |
| John Kearney | 15 May 1806 | 1741 – 22 May 1813 |
| Frank Kearton, Baron Kearton | 16 March 1961 | 18 February 1911 – 2 July 1992 |
| George Keate | 23 January 1766 | 30 November 1729 – 28 June 1797 |
| Thomas Keate | 27 March 1794 | 1745 – 5 July 1821 Surgeon, Chelsea Hospital |
| 15 May 2009 | |
| Robert Keck | 11 March 1714 | c. 1686 – 10 September 1719 Barrister |
| Frederick William Keeble | 1 May 1913 | 2 March 1870 – 19 October 1952 Prof. of Botany, Univ. Coll., Reading |
| Bernard Augustus Keen | 16 May 1935 | 5 September 1890 – 5 August 1981 Agriculturalist |
| Benjamin Keene | 31 January 1745 | 1697 – 15 December 1757 |
| 30 April 2014 | Geneticist, University of Edinburgh |
| David Keilin | 10 May 1928 | 22 March 1887 – 27 February 1963 |
| James Keill | 20 March 1712 | 27 March 1673 – 16 July 1719 |
| John Keill | 30 November 1700 | 1 December 1671 – 31 August 1721 |
| James Keir | 8 December 1785 | 29 September 1735 – 11 October 1820 |
| Arthur Keith | 1 May 1913 | 6 February 1866 – 7 January 1955 |
| Ralph Ambrose Kekwick | 17 March 1966 | 11 November 1908 – 17 January 2000 |
| Philip Kelland | 6 December 1838 | 17 October 1808 – 7 May 1879 |
| Charles Halliley Kellaway | 14 March 1940 | 16 January 1889 – 13 December 1952 |
| Andrew Keller | 16 March 1972 | 23 August 1925 – 8 February 1999, U.S. mathematician |
| Anthony Kelly | 15 March 1973 | Materials scientist |
| Francis Patrick Kelly | 16 March 1989 | |
| Michael Joseph Kelly | 11 March 1993 | |
| Henry Kelsall | 27 May 1736 | c. 1693 – 10 February 1762 |
| Charles Kemball | 18 March 1965 | 27 March 1923 – 4 September 1998 |
| Nicholas Kemmer | 15 March 1956 | 7 December 1911 – 21 October 1998 |
| Bruce Ernest Kemp | 9 May 2002 | |
| David Thomas Kemp | 27 May 2004 | |
| Stanley Wells Kemp | 7 May 1931 | 14 June 1882 – 16 May 1945 |
| John Kempe | 20 March 1712 | 1665 – 19 September 1717 Antiquary |
| Alfred Bray Kempe | 2 June 1881 | 6 July 1849 – 21 April 1922 |
| David George Kendall | 19 March 1964 | |
| James Pickering Kendall | 12 May 1927 | 30 July 1889 – 14 June 1978 |
| John Kendall | 12 March 1724 | - 1 January 1735 barrister |
| John-Michael Kendall | 2019-04-16 | |
| Kevin Kendall | 11 March 1993 | |
| Percy Fry Kendall | 15 May 1924 | 15 November 1856 – 19 March 1936 |
| John Cowdery Kendrew | 24 March 1960 | 24 March 1917 – 23 August 1997 |
| Olga Kennard | 19 March 1987 | crystallographer |
| Ernest Laurence Kennaway | 3 May 1934 | 23 May 1881 – 1 January 1958 |
| Archibald Kennedy, 1st Marquess of Ailsa | 18 February 1819 | February 1770 – 8 September 1846 |
| Gilbert Kennedy | 23 February 1738 | c. 1692 – 29 December 1780 Physician of Lisbon |
| John Stodart Kennedy | 18 April 1965 | 20 May 1912 – 4 February 1993 entomologist |
| Alexander Blackie William Kennedy | 9 June 1887 | 17 March 1847 – 1 November 1928 |
| William Quarrier Kennedy | 17 March 1949 | 30 November 1903 – 13 March 1979 |
| George Wallace Kenner | 19 March 1964 | 16 November 1922 – 26 June 1978 |
| James Kenner | 7 May 1925 | 13 April 1885 – 30 June 1974 |
| Brian Leslie Norman Kennett | 26 May 2005 | |
| Benjamin Kennicott | 16 February 1764 | 4 April 1718 – 18 August 1783 |
| Robert Charles Kennicutt | 2011-05-19 | |
| Percy Edward Kent | 17 March 1966 | 18 March 1913 – 9 July 1986 |
| Joseph Kenyon | 7 May 1936 | 8 April 1885 – 12 November 1961 Chemistry teacher |
| Charles Henry Bellenden Ker | 10 June 1819 | c. 1785 – 2 November 1871 |
| John Ker, 1st Duke of Roxburghe | 28 May 1707 | c. 1680 – 24 February 1741 |
| Robert Ker | 25 January 1776 | fl 1776 Ship's Captain, East India Coy |
| Theodor Kerckring | 17 January 1678 | 1640 – 2 November 1693 |
| Oleg Alexander Kerensky | 19 March 1970 | 16 April 1905 – 25 June 1984 |
| Thomas Kerigan | 29 February 1844 | - 1848 |
| William Ogilvy Kermack | 16 March 1944 | 26 April 1898 – 20 July 1970 |
| Allen Kerr | 20 March 1986 | |
| Ian Macpherson Kerr | 21 March 1985 | |
| John Kerr | 5 June 1890 | 17 December 1824 – 18 August 1907 |
| John Graham Kerr | 6 May 1909 | 18 September 1869 – 21 April 1957 |
| Roy Patrick Kerr | 2019-04-16 | 16 May 1934 – |
| Robert Masters Kerrison | 4 March 1841 | c. 1766 – 27 April 1847 |
| Richard Kerswell | 2012-04-19 | |
| Abel Ketelbey | 25 February 1720 | c. 1676 – 5 December 1744 |
| Robert Johnston Ketelbey | 12 May 1726 | - 30 June 1743 |
| Edgar Hartley Kettle | 7 May 1936 | 20 April 1882 – 1 December 1936 |
| Eric Barrington Keverne | 15 May 1997 | |
| Astley Cooper Key | 4 June 1868 | 18 January 1821 – 3 March 1888 |
| Thomas Hewitt Key | 7 June 1860 | 20 March 1799 – 29 November 1875 |
| Richard Darwin Keynes | 19 March 1959 | 14 August 1919 – 12 June 2010 Physiologist, Cambridge |
| Johann Georg Keyssler | 5 February 1719 | 13 April 1693 – 21 June 1743 |
| Chandrashekhar Bhalchandra Khare | 2012-04-19 | |
| Subhash Khot | 2017-05-05 | |
| Gurdev Singh Khush | 9 March 1995 | |
| Thomas Walter Bannerman Kibble | 20 March 1980 | |
| John Kidby | 3 June 1756 | c. 1696 – 2 July 1762 |
| Franklin Kidd | 16 March 1944 | 12 October 1890 – 7 May 1974 Biochemist |
| John Kidd | 28 March 1822 | 10 September 1775 – 17 September 1851 |
| Robert Kidston | 5 June 1902 | 29 June 1852 – 13 July 1924 |
| Francis Kiernan | 18 December 1834 | 2 October 1800 – 31 December 1874 |
| Tom Kilburn | 18 March 1965 | 11 August 1921 – 17 January 2001 |
| John Vincent Kilmartin | 9 May 2002 | |
| Peter Kinck | 16 October 1729 | fl 1729–1754 |
| Andrew King | 20 May 1663 | - ? March 1678 Original, Merchant |
| Andrew King | 2018-05-09 | 8 April 1959 – |
| David Anthony King | 14 March 1991 | |
| Edmond King | 18 July 1666 | 1629 – 30 May 1709 Physician |
| Edward King | 14 May 1767 | 1735 – 16 April 1807 |
| Frederick Ernest King | 18 March 1954 | 2 May 1905 – 14 August 1999 Professor of Chemistry, Nottingham Univ. |
| George King | 9 June 1887 | 12 April 1840 – 12 February 1909 Fellow |
| Harold King | 11 May 1933 | 25 February 1887 – 20 February 1956 Chemist, Nat.Inst. for Med.Research, Hampstead |
| James King | 1 March 1781 | 1750 – October 1784 |
| John King | 30 November 1676 | ? June 1648 – Rhetoric Professor, Gresham College |
| John Glen King | 21 February 1771 | 1732 – 3 November 1787 Clergyman |
| John King, 2nd Baron King of Ockham | 9 January 1735 | ? January 1706 – 10 February 1740 |
| 2017-05-05 | |
| Louis Vessot King | 15 May 1924 | 18 April 1886 – 6 June 1956 Professor of Physics, McGill University |
| Peter King, 1st Baron King of Ockham | 14 November 1728 | 1669 – 22 July 1734 |
| Phillip Parker King | 26 February 1824 | 13 December 1793 – 26 February 1856 |
| William King | 30 November 1705 | 1 May 1650 – 8 May 1729 |
| William Bernard Robinson King | 17 March 1949 | 12 November 1889 – 23 January 1963 |
| Desmond George King-Hele | 17 March 1966 | |
| William King, Earl of Lovelace and Viscount Ockham | 25 November 1841 | 21 February 1805 – 29 December 1893 |
| John Frank Charles Kingman | 18 March 1971 | |
| John Kingston | 25 April 1816 | fl 1816 |
| Anthony James Kinloch | 17 May 2007 | |
| George Kinnaird, 7th Lord Kinnaird | 19 February 1784 | 1745 – 11 October 1805 |
| 15 May 2009 | |
| Philip Joseph Kinski | 18 November 1731 | 28 November 1700 – 12 January 1749 |
| Frederic Stanley Kipping | 3 June 1897 | 16 August 1863 – 1 May 1949 |
| Andrew Kippis | 17 June 1779 | 28 March 1726 – 8 October 1795 |
| Anthony John Kirby | 19 March 1987 | |
| Joshua Kirby | 26 March 1767 | 1716 – 20 June 1774 |
| William Kirby | 5 March 1818 | 19 September 1759 – 4 July 1850 |
| Christfried Kirch | 16 December 1742 | 24 December 1694 – 9 March 1740 |
| John Kirk | 9 June 1887 | 19 December 1832 – 15 January 1922 |
| Thomas Kirke | 30 November 1693 | 22 December 1650 – 24 April 1706 |
| Thomas Penyngton Kirkman | 11 June 1857 | 31 March 1806 – 3 February 1895 |
| Frances Clare Kirwan | 10 May 2001 | |
| Richard Kirwan | 24 February 1780 | 1733 – 1 June 1812 |
| 16 May 2008 | |
| Finlay Lorimer Kitchin | 10 May 1928 | 13 December 1870 – 20 January 1934 |
| John Alwyne Kitching | 24 March 1960 | 24 October 1908 – 1 April 1996 |
| Martin Heinrich Klaproth | 16 April 1795 | 1 December 1743 – 1 January 1817 |
| Alfred Alexander Peter Kleczkowski | 15 March 1962 | 4 December 1908 – 27 November 1970 |
| Edward Emanuel Klein | 3 June 1875 | 32 October 1844 – 9 February 1925 |
| Jacobus Theodorus Klein | 6 March 1729 | 16 August 1685 – 27 February 1759 |
| Michael Lawrence Klein | 15 May 2003 | |
| David Klenerman | 2012-04-19 | |
| Samuel Klingenstierna | 23 April 1730 | August 1698 – ? November 1765 |
| Aaron Klug | 20 March 1969 | chemist, Nobel Prize (1982), President of Royal Society (1995–2000) |
| Edward Knatchbull | 6 May 1802 | 20 December 1781 – 24 May 1849 |
| James Lewis Knight-Bruce | 18 March 1830 | 16 February 1791 – 7 November 1866 |
| Gowin Knight | 25 April 1745 | ? September 1713 – 8 June 1772 |
| Henry Gally Knight | 20 May 1841 | 2 December 1786 – 9 February 1846 |
| John Knight | 4 December 1706 | c. 1687 – 2 October 1733 |
| Jonathan Cave Knight | 2019-04-16 | 17 June 1964 – |
| Ralph Knight | 28 May 1741 | fl 1741 |
| Peter Leonard Knight | 13 May 1999 | |
| Thomas Andrew Knight | 21 March 1805 | 12 August 1759 – 11 May 1838 |
| Cargill Gilston Knott | 13 May 1920 | 30 June 1856 – 26 October 1922 |
| John Frederick Knott | 15 March 1990 | |
| Jeremy Randall Knowles | 17 March 1977 | |
| John Knowles | 5 July 1821 | 1781 – 21 July 1841 |
| Francis Charles Knowles | 4 March 1830 | 10 June 1802 – 19 March 1892 |
| Francis Gerald William Knowles | 17 March 1966 | 9 March 1915 – 13 July 1974 |
| George Knox | 25 February 1802 | 14 January 1765 – 13 June 1827 |
| John Henderson Knox | 15 March 1984 | |
| Philip Joseph Kocienski | 15 May 1997 | |
| Egon Hynek Kodicek | 15 March 1973 | 3 August 1908 – 27 July 1982 |
| Ralph Kohn | 18 May 2006 | Honorary |
| Samuel Koleseri | 16 October 1729 | 18 November 1663 – 24 December 1732 |
| John Komarzewski | 10 May 1792 | c. 1744–1810 |
| George Armand Robert Kon | 18 March 1943 | 19 February 1892 – 15 March 1951 Fellow 18 March 1943 |
| Charles Dietrich Eberhard Konig | 18 January 1810 | 1774 – 6 September 1851 |
| Hans Leo Kornberg | 18 March 1965 | |
| Hans Walter Kosterlitz | 16 March 1978 | 27 April 1903 – 26 October 1996, biochemist, Nobel Prize (1953) |
| Tony Kouzarides | 2012-04-19 | |
| Hans Adolf Krebs | 20 March 1947 | 25 August 1900 – 22 November 1981 |
| John Richard Krebs | 15 March 1984 | |
| Von Kreienberg | 11 June 1713 | - ? 1743 |
| Georg Kreisel | 17 March 1966 | |
| David Krieg | 11 January 1699 | 1669 – 23 July 1710 Physician |
| Kariamanickam Srinivasa Krishnan | 14 March 1940 | 4 December 1898 – 14 June 1961 |
| Ondrej Krivanek | 2010-05-20 | |
| Peter Leslie Krohn | 21 March 1963 | |
| Hans Kronberger | 18 March 1965 | 28 July 1920 – 29 September 1970, nuclear physicist |
| Peter Benedict Kronheimer | 15 May 1997 | |
| Harold Walter Kroto | 15 March 1990 | chemist, Nobel Prize (1996) |
| Dietrich Kuchemann | 21 March 1963 | 12 September 1911 – 23 February 1976 |
| Tesser Samuel Kuckahn | 4 June 1772 | fl 1772 |
| Heinrich Gerhard Kuhn | 18 March 1954 | 10 March 1904 – 26 August 1994 |
| Dimitri Kullmann | 2018-05-09 | 1958 |
| Shrinivas R. Kulkarni | 10 May 2001 | astronomer |
| Eugenia Kumacheva | 2016-04-29 | |
| Nicholas Kurti | 15 March 1956 | 14 May 1908 – 24 November 1998, physicist, vice-president of Royal Society (1965–67) |
| Henricus Gerardus Jacobus Maria Kuypers | 17 March 1988 | 9 September 1925 – 26 September 1989 Neuroscientist, Cambridge University |
| Dominic Kwiatkowski | 2018-05-09 | |
| Marta Zofia Kwiatkowska | 2019-04-16 | 1957 |
| Alexander Kyd | 16 March 1820 | c. 1754 – 25 November 1826 Lieutenant-General | |
| Names | Election date | Notes |
|---|
| Thomas Howell Laby | 7 May 1931 | 3 May 1880 – 21 June 1946 |
| Nicolas Louis de Lacaille | 17 January 1760 | ? 15 May 1713 – 21 March 1762 |
| Peter Julius Lachmann | 18 March 1982 | |
| David Lambert Lack | 15 March 1951 | 16 July 1910 – 12 March 1973 |
| Thomas Fantet de Lagny | 1 December 1718 | 7 November 1660 – ? 12 April 1734 |
| Joseph Louis Lagrange | 5 May 1791 | 25 January 1736 – 10 April 1813 |
| Patrick Playfair Laidlaw | 12 May 1927 | 26 September 1881 – ? 20 March 1940 |
| David Laing | 23 November 1843 | 1800 – 6 August 1860 Clergyman |
| Ralph Lainson | 18 March 1982 | |
| Thomas Lake | 14 February 1667 | fl 1657–1711 |
| Devendra Lal | 15 March 1979 | |
| Joseph Jerome le François de Lalande | 24 November 1763 | 11 July 1732 – 4 April 1807 |
| 16 May 2008 | |
| Horace Lamb | 12 June 1884 | ? 27 November 1849 – 4 December 1934 |
| Trevor David Lamb | 11 March 1993 | |
| William Lamb, 2nd Viscount Melbourne | 25 February 1841 | 15 March 1779 – 24 November 1848 |
| Robert Lambe | 6 April 1758 | - 3 November 1769 |
| Kurt Lambeck | 10 March 1994 | |
| Aylmer Bourke Lambert | 31 March 1791 | 3 February 1761 – 10 January 1842 |
| William Lambton | 9 January 1817 | 1756 – 26 January 1823 |
| Angus Iain Lamond | 20 May 2010 | Molecular biologist |
| Charles Lamotte | 22 June 1727 | - 25 February 1742 |
| George William Lamplugh | 11 May 1905 | 8 April 1859 – 9 October 1926 |
| Frederick William Lanchester | 11 May 1922 | ? 23 October 1868 – 8 March 1946 |
| Giovanni Maria Lancisi | 20 November 1706 | 26 October 1654 – 20 January 1720 |
| Michael Francis Land | 18 March 1982 | neurobiologist |
| Russell Lande | 19 April 2012 | |
| John Landen | 16 January 1766 | 23 January 1719 – 15 January 1790 |
| Anthony Milner Lane | 20 March 1975 | 27 July 1928 – 9 February 2011 |
| David Philip Lane | 14 March 1996 | |
| George Lane, 1st Viscount Lanesborough | 19 February 1662 | c. 1621 – 11 December 1683 |
| Joseph Lane | 31 January 1678 | - June 1728 Barrister |
| Ralph Lane | 30 November 1692 | - 1732 Turkey merchant |
| Timothy Lane | 11 January 1770 | June 1734 – 5 July 1807 Apothecary |
| Benjamin Laney | 14 November 1666 | 1591 – 24 January 1675 |
| Andrew Richard Lang | 20 March 1975 | 9 February 1924 – 30 June 2008 |
| William Dickson Lang | 2 May 1929 | 29 December 1878 – 7 March 1966 |
| William Henry Lang | 4 May 1911 | 12 May 1874 – 29 August 1960 |
| Jane Alison Langdale | 2015-05-01 | 1960 – Botanist |
| John de Lange | 11 March 1736 | - 7 July 1755 |
| William Langford | 17 March 1796 | fl 1796 Master, Eton School |
| James Langham | 17 January 1678 | c. 1620 – 22 August 1699 |
| Robert Phelan Langlands | 19 March 1981 | |
| John Newport Langley | 7 June 1883 | 2 November 1852 – 5 November 1925 |
| Browne Langrish | 16 May 1734 | - 29 November 1759 |
| Edwin Lankester | 18 December 1845 | 23 April 1814 – 30 October 1874 |
| Edwin Ray Lankester | 3 June 1875 | 15 May 1847 – 15 August 1929 |
| Jacob Frederick Lantsheer | 13 May 1756 | fl 1756 |
| Edward Lany | 30 November 1692 | c. 1667 – 9 August 1728 |
| Pierre Simon Laplace | 30 April 1789 | 28 March 1749 – 5 March 1827 |
| Michael Franz Lappert | 15 March 1979 | 21 December 1928 – 28 March 2014 Chemist |
| Arthur Lapworth | 5 May 1910 | 10 October 1872 – 5 April 1941 |
| Charles Lapworth | 7 June 1888 | ? 20 September 1842 – 13 March 1920 |
| Thomas Aiskew Larcom | 16 May 1844 | 22 April 1801 – 15 June 1879 Cartographer & civil servant |
| Dionysius Lardner | 28 February 1828 | 3 April 1793 – 29 April 1859 |
| William Larkins | 14 April 1796 | - 24 April 1800 |
| Joseph Larmor | 2 June 1892 | 11 July 1857 – 19 May 1942 |
| 15 May 2009 | |
| Thomas Lashley | 24 November 1768 | - 1807 |
| Ronald Alfred Laskey | 15 March 1984 | |
| William Lassell | 7 June 1849 | 18 June 1799 – 5 October 1880 |
| John Latham | 25 May 1775 | 27 June 1740 – 4 February 1837 |
| John Latham | 30 April 1801 | 29 December 1761 – 20 April 1843 physician |
| Robert Gordon Latham | 9 June 1848 | 24 March 1812 – 9 March 1888 |
| William Latham | 10 November 1796 | - 7 February 1807 Antiquarian |
| John Lauder | 24 December 1772 | fl 1772 |
| Simon Barry Laughlin | 11 May 2000 | |
| Anthony Seymour Laughton | 20 March 1980 | |
| Brian Edward Launder | 10 March 1994 | |
| Steffen Lilholt Lauritzen | 19 May 2011 | |
| Jean Rodolphe Lavater | 30 November 1708 | fl 1704–1716 |
| William Graeme Laver | 19 March 1987 | |
| Antoine Laurent Lavoisier | 3 April 1788 | ? August 1743 – 8 May 1794 |
| George Henry Law | 24 February 1814 | 12 September 1761 – 22 September 1845 |
| John Law | 20 March 1783 | 1745 – 18 March 1810 |
| John Bennet Lawes | 1 June 1854 | 28 December 1814 – 31 August 1900 |
| Peter Anthony Lawrence | 17 March 1983 | |
| Edward Lawrence | 30 November 1708 | - 1725 Customs collector, Gentleman Usher |
| John Lawrence | 27 November 1673 | - 26 January 1692 Merchant & Lord Mayor of London |
| Thomas Lawrence | 28 February 1822 | 4 May 1769 – 7 January 1830 |
| William Lawrence | 11 November 1813 | 16 July 1783 – 5 July 1867 |
| Peter John Lawrenson | 18 March 1982 | |
| John Lawry | 17 June 1742 | c. 1716 – ? 28 August 1773 Clergyman |
| Richard Maitland Laws | 20 March 1980 | |
| Henry Lawson | 21 May 1840 | 23 March 1774 – 22 August 1855 Astronomer & Meteorologist |
| James Lawson | 12 March 1812 | - 9 April 1818 Chief engineer of the Mint |
| John David Lawson | 17 March 1983 | |
| Wilfrid Lawson | 11 December 1718 | 1697 – 13 July 1737 |
| John Hartley Lawton | 16 March 1989 | |
| William Lax | 5 May 1796 | 1761 – 29 October 1836 |
| Charles Peter Layard | 26 March 1778 | 1749 – 10 April 1803 Dean of Bristol |
| Daniel Peter Layard | 22 January 1747 | 1721–1802 |
| 30 April 2014 | |
| Corinne Le Quéré | 2016-04-29 | |
| 5 June 1890 | 1 December 1853 – 23 March 1915 |
| Sydney Leach | 11 March 1993 | |
| William Elford Leach | 15 February 1816 | 2 February 1791 – 25 August 1836 |
| Peter Francis Leadlay | 11 May 2000 | |
| William Martin Leake | 13 April 1815 | 14 January 1777 – 6 January 1860 |
| Richard Leakey | 17 May 2007 | 19 December 1944 – 2 January 2022 |
| John Beresford Leathes | 4 May 1911 | 5 November 1864 – 14 September 1956 |
| Christopher John Leaver | 20 March 1986 | |
| Charles Philippe Leblond | 18 March 1965 | 6 February 1910 – 10 April 2007 |
| Georges-Louis Leclerc, Comte de Buffon | 7 February 1740 | 7 September 1707 – 16 April 1788 |
| Thomas Lediard | 9 December 1742 | 1685 – June 1743 |
| John Charles Grant Ledingham | 12 May 1921 | 19 May 1875 – 4 October 1944 |
| Anthony Ledwith | 9 March 1995 | 14 August 1933 – 5 January 2015 Chemist |
| Arthur Lee | 29 May 1766 | 21 December 1740 – 12 December 1792 |
| Charles Dillon Lee, 12th Viscount Dillon of Costello-Gallen | 28 May 1767 | 1745 – 9 November 1813 |
| James Prince Lee | 21 June 1849 | 28 July 1804 – 24 December 1869 |
| John Lee | 15 February 1781 | - 6 July 1822 Physician |
| John Lee | 24 February 1831 | 28 April 1783 – 25 February 1866 Antiquary |
| Robert Lee | 25 March 1830 | 1793 – 6 February 1877 |
| Stephen Lee | 19 April 1798 | - 1835 Astronomer |
| William Lee | 26 May 1748 | fl 1748 Son of Lord Chief Justice William Lee |
| Anthony David Lees | 21 March 1968 | 27 February 1917 – 3 October 1992 |
| Charles Herbert Lees | 3 May 1906 | 28 July 1864 – 25 September 1952 |
| George Martin Lees | 18 March 1948 | 16 April 1898 – 25 January 1955 |
| Henry Beaumont Leeson | 7 June 1849 | 1800 – 8 November 1872 |
| Antoni van Leeuwenhoek | 29 January 1680 | 24 October 1632 – 26 August 1723 |
| Charles Shaw Lefevre | 10 November 1796 | - 27 April 1823 |
| John Henry Lefroy | 9 June 1848 | 28 January 1817 – 11 April 1890 |
| Edward Legge | 26 February 1736 | 1710 – 19 September 1747 |
| George Legge, 3rd Earl of Dartmouth | 3 May 1781 | 3 October 1755 – 1 November 1810 |
| William Legge, 2nd Earl of Dartmouth | 7 November 1754 | 20 June 1731 – 15 July 1801 |
| William Legge, 4th Earl of Dartmouth | 7 November 1822 | 29 November 1784 – 22 November 1853 |
| Anthony James Leggett | 20 March 1980 | |
| Thomas Legh | 12 June 1817 | 1793 – 8 May 1857 |
| Anthony Charles Legon | 11 May 2000 | |
| Alan Robert Lehmann | 20 May 2010 | |
| Hermann Lehmann | 16 March 1972 | 8 July 1910 – 13 July 1985 |
| Gottfried Wilhelm Leibniz | 9 April 1673 | ? 21 June 1646 – 14 November 1716 |
| Ralph Leicester | 7 May 1724 | c. 1699–1777 |
| Charles Leigh | 13 May 1685 | 1662 – ? 1717 Physician |
| David Alan Leigh | 15 May 2009 | |
| Ellis Leighton | 9 December 1663 | - 9 January 1685 |
| 30 April 2014 | Professor of Ultrasonics, Southampton University |
| Robert Thomson Leiper | 3 May 1923 | 17 April 1881 – 21 May 1969 Parasitologist, London |
| Sir William Boog Leishman | 5 May 1910 | 6 November 1865 – 2 June 1926 |
| Theodore Forbes Leith | 20 December 1781 | 1746 – 6 September 1819 |
| Max Rudolf Lemberg | 20 March 1952 | 19 October 1896 – 10 April 1975 |
| Raymond Urgel Lemieux | 16 March 1967 | 16 June 1920 – 22 July 2000 |
| Mark A. Lemmon | 2016-04-29 | Pharmacologist |
| Charles Lemon | 23 May 1822 | 30 September 1784 – 13 February 1868 |
| John Edward Lennard-Jones | 11 May 1933 | 27 October 1894 – 1 November 1954 |
| Dacre Barret Lennard | 30 November 1705 | - 1733 |
| Charles Lennox, 2nd Duke of Richmond, Lennox and Aubigny | 6 February 1724 | 18 May 1701 – 8 August 1750 |
| Charles Lennox, 3rd Duke of Richmond and Lennox | 11 December 1755 | 23 February 1735 – 29 December 1806 |
| Gerald Ponsonby Lenox-Conyngham | 2 May 1918 | 21 August 1866 – 27 October 1956 |
| Leopold I, King of the Belgians | 30 November 1816 | ? 18 December 1790 – 10 December 1865 Royal |
| Leopold II, Grand Duke of Tuscany | 24 May 1838 | 3 October 1797 – 29 January 1870 |
| Johann Friedrich Leopold | 4 May 1709 | 3 February 1676 – 4 May 1711 |
| Antonio Leprotti | 16 May 1734 | c. 1684–1747 |
| Andrew Greig William Leslie | 10 May 2001 | |
| Frank Matthews Leslie | 9 March 1995 | 8 March 1935 – 15 June 2000 Prof. of Mathematics, Strathclyde Univ. |
| John Leslie | 22 January 1807 | 20 November 1759 – November 1824 Soldier, aka John Curning |
| Patrick Duguid Leslie | 8 November 1781 | - 1783 Physician |
| John Letch | 20 March 1766 | - 17 September 1781 |
| Smart Lethieullier | 12 March 1724 | 3 November 1701 – 27 August 1760 |
| Gregorio Leti | 30 November 1681 | 29 May 1630 – 9 June 1701 |
| John Coakley Lettsom | 18 November 1773 | 22 November 1744 – 1 November 1815 |
| James Lever | 10 February 1743 | - 25 January 1749 |
| Ashton Lever | 18 February 1773 | 5 March 1729 – 24 January 1788 |
| John Leveret | 11 March 1714 | 25 August 1662 – 3 May 1724 President of Harvard College, Mass. |
| George Granville William Sutherland Leveson-Gower, 3rd Duke of Sutherland | 24 November 1870 | 19 December 1828 – 22 September 1892 |
| Granville George Leveson-Gower, 2nd Earl Granville | 13 January 1853 | 11 May 1815 – 31 March 1891 |
| William Russell Levick | 18 March 1982 | |
| Malcolm Harris Levitt | 17 May 2007 | |
| Michael Levitt | 10 May 2001 | biophysicist, computational biology |
| John Lewin | 20 June 1765 | - 1770 |
| Dan Lewis | 17 March 1955 | Plant geneticist, John Innes Inst. |
| George Lewis | 13 June 1754 | fl 1754 |
| Jack Lewis, Baron Lewis of Newnham | 15 March 1973 | 13 February 1928 – 17 July 2014 |
| Julian Hart Lewis | 19 April 2012 | 12 August 1946 – 30 April 2014 |
| Thomas Lewis | 2 May 1918 | 26 December 1881 – 17 March 1945 |
| Thomas Frankland Lewis | 8 June 1820 | 14 May 1780 – 22 January 1855 |
| Thomas Locke Lewis | 5 May 1836 | - 17 November 1852 |
| Wilfrid Bennett Lewis | 22 March 1945 | 24 June 1908 – 10 January 1987 |
| William Lewis | 31 October 1745 | ? June 1708 – 21 January 1781 |
| William Cudmore McCullagh Lewis | 6 May 1926 | 30 June 1885 – 11 February 1956 Prof Physical Chem, Liverpool Univ |
| William James Lewis | 6 May 1909 | 16 January 1847 – 16 April 1926 |
| Steven Victor Ley | 15 March 1990 | |
| Thomas Leybourn | 2 April 1835 | 9 April 1770 – 1 March 1840 |
| Johann Borkman Leyonbergh | 21 November 1667 | ? February 1625 – August 1691 |
| Christian Leyoncrona | 1 December 1701 | c. 1662 – 8 April 1710 |
| Ottoline Leyser | 17 May 2007 | |
| Edward Lhuyd | 30 November 1708 | 1660 – 30 June 1709 |
| Georg Christoph Lichtenberg | 11 April 1793 | ? 1 July 1744 – 24 |
| Edward George Tandy Liddell | 16 March 1939 | 25 March 1895 – 17 August 1981 |
| John Liddell | 18 June 1846 | 1794 – 28 May 1868 Royal Navy surgeon |
| Johann Nathaniel Lieberkuhn | 18 December 1740 | 5 September 1711 – 7 December 1756 |
| Johann Georg Liebknecht | 5 December 1728 | ? 23 April 1679 – 17 September 1749 |
| Joseph Lieutaud | 21 June 1739 | 21 June 1703 – ? 11 December 1780 |
| Eddie Liew | 19 April 2013 | |
| Graham Collingwood Liggins | 20 March 1980 | 24 June 1926 – 24 August 2010 Prof of Obstetrics, Auckland |
| John Lightfoot | 8 March 1781 | 10 December 1735 – 20 February 1788 |
| Michael James Lighthill | 19 March 1953 | 23 January 1924 – 17 July 1998 |
| Stafford Lightman | 2017-05-05 | |
| John Ligonier, 1st Earl Ligonier | 26 October 1749 | 7 November 1680 – 28 April 1770 |
| John Lihou | 6 June 1833 | 25 May 1792 – 13 July 1840 |
| David Malcolm James Lilley | 9 May 2002 | |
| Malcolm Douglas Lilly | 14 March 1991 | 9 August 1936 – 18 May 1998 |
| 30 April 2014 | Astronomist, ETH Zürich |
| John Philip de Limbourg | 30 May 1771 | 1726 – 1 February 1811 |
| Johann Heinrich Linck | 11 December 1718 | 17 December 1674 – 29 October 1734 |
| James Lind | 18 December 1777 | 17 May 1736 – 17 October 1812 Physician |
| John Lind | 25 November 1773 | 13 August 1737 – 12 January 1781 |
| Linda | 30 November 1711 | fl 1711 |
| Tomas Robert Lindahl | 17 March 1988 | |
| Frederick Alexander Lindemann, Viscount Cherwell | 13 May 1920 | 5 April 1886 – 3 July 1957 |
| Paul Fredrick Linden | 17 May 2007 | |
| John Lindley | 17 January 1828 | 5 February 1799 – 1 November 1865 |
| Nathaniel Lindley, Baron Lindley | 20 January 1898 | 29 November 1828 – 9 December 1921 |
| David Alexander Edward Lindsay, 27th Earl of Crawford and 10th Earl of Balcarres | 6 November 1924 | 11 October 1871 – 8 March 1940 Statute |
| James Ludovic Lindsay, 26th Earl of Crawford and 9th Earl of Balcarres | 6 June 1878 | 28 July 1847 – 31 January 1913 |
| John Lindsay, 20th Earl of Crawford | 15 June 1732 | 4 October 1702 – 20 September 1749 |
| Heinrich Friedrich Link | 5 May 1842 | 3 February 1767 – 1 January 1851 |
| Carl Linnaeus | 3 May 1753 | ? 24 May 1707 – 10 January 1778 |
| Anthony William Linnane | 20 March 1980 | |
| John Wilfrid Linnett | 17 March 1955 | 3 August 1913 – 7 November 1975 |
| Reginald Patrick Linstead | 14 March 1940 | 28 August 1902 – 22 September 1966 |
| Hugues Louis De Lionne | 28 June 1665 | fl 1665 |
| Henry Solomon Lipson | 21 March 1957 | 11 March 1910 – 26 April 1991 |
| John Liptrap | 4 March 1802 | fl 1802 |
| Joseph-Nicolas Delisle | 12 March 1724 | 4 April 1688 – ? 11 July 1768 |
| Samuel Lisle | 17 June 1742 | 1683 – 3 October 1749 |
| Thomas Lisle | 5 May 1757 | - 31 March 1767 Clergyman, Hampshire |
| 16 May 2008 | |
| Hans Werner Lissmann | 18 March 1954 | 30 April 1909 – 21 April 1995 |
| Arthur Lister | 9 June 1898 | 17 April 1830 – 19 July 1908 |
| Joseph Jackson Lister | 14 June 1900 | 3 August 1857 – 5 February 1927 Zoologist |
| Joseph Jackson Lister | 2 February 1832 | 11 January 1786 – 24 October 1869 |
| Joseph Lister, 1st Baron Lister of Lyme Regis | 7 June 1860 | 6 April 1827 – 10 February 1912 |
| Martin Lister | 2 November 1671 | 12 April 1639 – 2 February 1712 |
| Robert Liston | 13 May 1841 | 28 October 1794 – 7 December 1847 |
| Albert Edward Litherland | 21 March 1974 | |
| Edmond Littlehales | 30 November 1717 | c. 1690 – 24 September 1724 |
| Edward John Littleton, 1st Baron Hatherton | 15 February 1855 | 18 March 1791 – 4 May 1863 |
| John Edensor Littlewood | 11 May 1916 | 9 June 1885 – 6 September 1977 |
| Peter Brent Littlewood | 17 May 2007 | Head of Cavendish Laboratory |
| George Downing Liveing | 12 June 1879 | 21 December 1827 – 26 December 1924 |
| Archibald Liversidge | 8 June 1882 | 17 November 1847 – 26 September 1927 |
| David Livingstone | 3 June 1858 | 19 March 1813 – 1 May 1873 |
| Peter Livius | 29 April 1773 | 1727 – 23 July 1795 |
| John Dillwyn Llewelyn | 4 February 1836 | 12 January 1810 – 24 August 1882 |
| Charles Lloyd | 8 March 1764 | 1735 – 22 January 1773 secretary & antiquarian |
| David Graham Lloyd | 12 March 1992 | 20 June 1937 – 30 May 2006 NZ botanist |
| Edward Lloyd | 12 March 1818 | - 29 April 1855 Rear-admiral |
| George Lloyd | 10 February 1737 | c. 1708 – 4 December 1783 |
| Humphrey Lloyd | 21 January 1836 | 16 April 1800 – 17 January 1881 Clergyman, optics & magnetism |
| John Lloyd | 15 December 1774 | 25 January 1750 – 24 April 1815 |
| John Lloyd | 8 November 1759 | c. 1735 – 8 June 1777 |
| John Augustus Lloyd | 11 March 1830 | 1 May 1800 – 10 October 1854 |
| Owen Lloyd | 1 December 1701 | c. 1674–1738 Clergyman |
| Philemon Lloyd | 9 November 1727 | fl 1727–1735 |
| Robert Glanville Lloyd | 11 May 2000 | |
| William Forster Lloyd | 10 April 1834 | 1794 – 2 June 1852 |
| Guy Charles Lloyd-Jones | 3 May 2013 | |
| Yuk Ming Dennis Lo | 19 May 2011 | |
| Theophilus Lobb | 6 March 1729 | 17 August 1678 – 19 May 1763 |
| Ferdinand Philip Lobkowitz | 2 July 1747 | 1724–1784 |
| John Lock | 4 February 1742 | - 1767 |
| William Lock | 7 February 1754 | c. 1687 – 21 October 1761 MP for Grimsby |
| John Locke | 26 November 1668 | 29 August 1632 – 28 October 1704 |
| Joseph Locke | 22 February 1838 | 9 August 1805 – 18 September 1860 |
| Edward Hawke Locker | 5 December 1811 | 9 October 1777 – 16 October 1849 |
| John Lockman | 25 June 1778 | c. 1721 – 27 December 1807 |
| Ben Lockspeiser | 17 March 1949 | 9 March 1891 – 18 October 1990 |
| Michael Lockwood | 18 May 2006 | Physicist, Reading Univ. |
| Charles Lockyer | 15 May 1740 | - 13 April 1752 |
| Joseph Norman Lockyer | 3 June 1869 | 17 May 1836 – 16 August 1920 |
| Jean Marie François du Parc Locmaria | 12 January 1744 | c. 1708 – 2 October 1745 |
| Charles Locock | 2 June 1864 | 21 April 1799 – 23 July 1875 |
| David Lodge | 2016-04-29 | Physiologist |
| Oliver Joseph Lodge | 9 June 1887 | 12 June 1851 – 22 August 1940 |
| Francis Lodwick | 30 November 1681 | ? August 1619 – 5 January 1694 |
| William Edmond Logan | 5 June 1851 | 20 April 1798 – ? 22 June 1875 |
| Heinz London | 16 March 1961 | 7 November 1907 – 3 August 1970 |
| Charles Long, 1st Baron Farnborough | 2 February 1792 | 1761 – 17 January 1838 |
| Roger Long | 8 May 1729 | 3 February 1680 – 16 December 1770 |
| James Long | 20 May 1663 | ? 1617 – 22 January 1692 Original |
| Walter Hume Long, 1st Viscount Long of Wraxall | 19 June 1902 | 13 July 1854 – 26 September 1924 |
| William Long | 16 April 1801 | - 1818 |
| Malcolm Sim Longair | 27 May 2004 | |
| Hugh Christopher Longuet-Higgins | 20 March 1958 | 11 April 1923 – 27 March 2004 |
| Michael Selwyn Longuet-Higgins | 21 March 1963 | 8 December 1925 - 26 February 2016 |
| Kathleen Yardley Lonsdale | 22 March 1945 | 28 January 1903 – 1 April 1971 |
| Gilbert George Lonzarich | 16 March 1989 | |
| Antonio Maria Lorgna | 3 April 1788 | 1730 – 28 June 1796 |
| George Huntly Lorimer | 20 March 1986 | |
| Michael Lort | 15 May 1766 | 1725 – 5 November 1790 |
| John Gideon Loten | 27 November 1760 | 16 May 1710 – 25 February 1789 |
| Rodney Loudon | 19 March 1987 | |
| Archduke Louis of Austria | 8 February 1816 | 13 December 1784 – 21 December 1864 Royal |
| John Freeman Loutit | 21 March 1963 | 20 February 1910 – 11 June 1992, medical researcher, radiobiologist |
| Augustus Edward Hough Love | 7 June 1894 | 17 April 1863 – 5 June 1940 |
| Edward Loveden Loveden | 14 November 1805 | 1751 – 4 January 1822 |
| Robin Howard Lovell-Badge | 10 May 2001 | |
| Alfred Charles Bernard Lovell | 17 March 1955 | 31 August 1913 – 6 August 2012 |
| James Ephraim Lovelock | 21 March 1974 | |
| Martin Geoffrey Low | 14 March 1996 | |
| Edward Joseph Lowe | 6 June 1867 | 11 November 1825 – 10 March 1900 |
| George Lowe | 18 December 1834 | 1788 – 25 December 1868 Gas Engineer |
| Gordon Lowe | 15 March 1984 | 31 May 1933 – 6 August 2003 Organic Chemist |
| 16 May 2008 | |
| Robert Lowe, Viscount Sherbrooke | 25 May 1871 | 4 December 1811 – 27 July 1892 |
| Otto Egon Lowenstein | 17 March 1955 | 24 October 1906 – 31 January 1999 zoologist, Birmingham University |
| Richard Lower | 17 October 1667 | 1631 – 17 January 1691 |
| Ralph Lowndes | 15 July 1696 | 29 October 1662 – 31 August 1727 |
| Thomas Martin Lowry | 7 May 1914 | 26 October 1874 – 2 November 1936 |
| Wilson Lowry | 5 March 1812 | 24 January 1762 – 23 June 1824 |
| Robert Lowth | 21 November 1765 | 27 November 1710 – 3 November 1787 Bishop of London |
| Anthony Lowther | 20 May 1663 | ? May 1641 – 27 January 1693 Original |
| Henry Lowther, 3rd Viscount Lonsdale | 21 January 1742 | 1694 – 12 March 1751 |
| John Lowther, 1st Viscount Lonsdale | 20 December 1699 | 25 April 1655 – 10 July 1700 |
| James Lowther | 25 November 1736 | 5 August 1673 – 2 January 1755 |
| Sir John Lowther, 2nd Baronet | 27 January 1664 | ? November 1642 – ? January 1706 |
| William Lowther, 2nd Earl of Lonsdale | 5 July 1810 | 21 July 1787 – 4 March 1872 |
| John Lowthorp | 30 November 1702 | c. 1659 – 2 September 1724 |
| John Lubbock, 1st Baron Avebury | 3 June 1858 | 30 April 1834 – 28 May 1913 |
| Sir John William Lubbock, 2nd Baronet | 15 November 1821 | 26 August 1774 – 22 October 1840 |
| Sir John William Lubbock, 3rd Baronet | 15 January 1829 | 26 March 1803 – 20 June 1865 |
| Jean-André Deluc | 10 June 1773 | 9 February 1727 – 7 November 1817 Geologist, meteorologist |
| Cyril Edward Lucas | 17 March 1966 | 30 July 1909 – 12 January 2002 |
| John Lucas, 1st Baron Lucas of Shenfield | 20 May 1663 | ? October 1606 – 2 July 1671 Original |
| Keith Lucas | 1 May 1913 | 8 March 1879 – 5 October 1916 |
| Richard Lucas | 15 March 1722 | c. 1693 – ? October 1747 Rector, Foots Cray, Kent |
| Sir Berkeley Lucy, 3rd Baronet | 23 March 1698 | c. 1672 – 19 November 1759 |
| Sir Kingsmill Lucy, 2nd Baronet | 26 November 1668 | c. 1649 – 19 September 1678 |
| Ludlow | 30 November 1702 | fl 1702 |
| Carlo Maria Luigi, Count of Barbiano and Belgiojoso | 3 May 1781 | 2 January 1728 – 1801 |
| James Luke | 7 June 1855 | ? 1798 – 15 August 1881 |
| Johan Luloss | 18 March 1762 | 5 August 1711 – 4 November 1768 |
| Andrew Gino Sita Lumsden | 10 March 1994 | |
| John Walter Guerrier Lund | 21 March 1963 | Phycologist |
| Raymond Douglas Lund | 12 March 1992 | |
| Francis Lunn | 11 February 1819 | 14 October 1795 – 4 August 1839 |
| Edmund Henry Lushington | 18 March 1824 | 11 July 1776 – 27 March 1839 |
| George Lusztig | 17 March 1983 | |
| Richard Lydekker | 7 June 1894 | 25 July 1849 – 16 April 1915 |
| Nicholas B Lydon | 2 May 2013 | 27 May 1957 – |
| Charles Lyell | 2 February 1826 | 14 November 1797 – 22 February 1875 |
| William Beauchamp Lygon, 2nd Earl Beauchamp | 6 December 1810 | 1782 – 12 May 1823 |
| Thomas Ranken Lyle | 2 May 1912 | 26 August 1860 – 31 March 1944 |
| Donald Lynden-Bell | 16 March 1978 | |
| Ruth Marion Lynden-Bell | 18 May 2006 | |
| 30 April 2014 | |
| Andrew Geoffrey Lyne | 14 March 1996 | |
| George Francis Lyon | 15 November 1827 | 1795 – 8 October 1832 |
| Mary Frances Lyon | 15 March 1973 | |
| Pierre Lyonet | 14 January 1748 | ? 21 July 1707 – 10 January 1789 |
| Henry George Lyons | 3 May 1906 | 11 October 1864 – 10 August 1944 |
| Terence John Lyons | 9 May 2002 | |
| Daniel Lysons | 25 May 1797 | 28 April 1762 – 3 January 1834 |
| Samuel Lysons | 2 February 1797 | 17 May 1763 – 29 June 1819 |
| Basil Lythgoe | 20 March 1958 | |
| Charles Lyttelton | 27 January 1743 | 1714 – 22 December 1768 |
| George William Lyttelton, 4th Baron Lyttelton | 30 April 1840 | 31 March 1817 – 19 April 1876 |
| George Lyttelton, 1st Baron Lyttelton | 26 January 1744 | 17 January 1709 – 22 August 1773 |
| Raymond Arthur Lyttleton | 17 March 1955 | 7 May 1911 – 16 May 1995 |
| Richard Warburton Lytton | 28 May 1772 | 1745–1810 | |
