| St Andrew St John | April 1783 | December 1783 |
| Cospatrick Alexander Home, Lord Dunglass | 1828 | 1830 |
| Edward Henry Smith Stanley, Baron Stanley | 1852 | 1855 |
| John Wodehouse, Baron Wodehouse of Kimberley | 1852 | 1856 |
| Austen Henry Layard | 12 February 1852 | 21 February 1852 |
| Henry Petty-Fitzmaurice, Earl of Shelburne | 1856 | 1858 |
| John Wodehouse, Baron Wodehouse of Kimberley | 1859 | 1861 |
| Austen Henry Layard | 15 August 1861 | 26 June 1866 |
| Sir Charles Wentworth Dilke, bt | 1880 | 1882 |
| James Bryce | 7 February 1886 | 20 July 1886 |
| Rt Hon Sir James Fergusson, bt | 4 August 1886 | 22 September 1891 |
| Rt Hon Sir Edward Grey, bt | 1892 | 1895 |
| Henry Algernon George Percy, Earl Percy | 9 October 1903 | 4 December 1905 |
| Edgar Algernon Robert Cecil | 1915 | 1916 |
| Rt Hon Robert Anthony Eden | 1931 | 1934 |
| Rt Hon George Henry Hall | September 1943 | July 1945 |
| Christopher Paget Mayhew | October 1946 | March 1950 |
| William David Ormsby-Gore | November 1956 | January 1957 |
| Rt Hon John Dennis Profumo | 1958 | 1959 |
| William Thomas Rodgers | 1967 | 1968 |