| Rt Hon Sir Hudson Ewbanke Kearley, Baron Devonport | 10 December 1916 | 1 June 1917 |
| Rt Hon David Alfred Thomas, Baron Rhondda | 19 June 1917 | 3 July 1918 |
| Rt Hon Joseph Robert Clynes | 9 July 1918 | 10 January 1919 |
| Rt Hon George Henry Roberts | 10 January 1919 | 19 March 1920 |
| Charles Albert McCurdy | 19 March 1920 | 31 March 1921 |