| Henry Dundas | 1775 | 1779 |
| George Patton | July 1866 | February 1867 |
| James Avon Clyde | December 1916 | January 1920 |
| Craigie Mason Aitchison | 19 June 1929 | October 1933 |
| Rt Hon John Thomas Wheatley | October 1947 | October 1951 |
| Rt Hon James Latham McDiarmid Clyde | November 1951 | December 1954 |
| William Rankine Milligan | December 1954 | April 1960 |
| Rt Hon William Grant | April 1960 | August 1962 |
| Rt Hon Norman Russell Wylie | June 1970 | February 1974 |
| Ronald King Murray | March 1974 | May 1979 |
| Peter Lovat Fraser | 1989 | 1992 |