| Rt Hon Lawrence John Lumley Dundas, Earl of Zetland | 28 May 1937 | 13 May 1940 |
| Rt Hon Leopold Charles Maurice Stennett Amery | 13 May 1940 | 26 July 1945 |
| Rt Hon Frederick William Pethick-Lawrence | 3 August 1945 | 17 April 1947 |
| William Francis Hare, Earl of Listowel | 23 April 1947 | 15 August 1947 |