| Dr Christopher Addison | 1915 | June 1916 |
| Sir Laming Worthington-Evans, bt | 14 December 1916 | 30 January 1918 |
| Frederick George Kellaway | 14 December 1916 | 1 April 1920 |
| Rt Hon John Edward Bernard Seely | 10 July 1918 | 10 January 1919 |
| Sir John Lawrence Baird, bt | 10 January 1919 | 29 April 1919 |