| Rt Hon Sir Philip Lloyd-Greame, Viscount Swinton | 24 November 1952 | 1955 |
| Rt Hon Alexander Frederick Douglas-Home, Earl of Home | April 1955 | July 1960 |
| Rt Hon Arthur George Bottomley | 16 October 1964 | 1 August 1966 |
| Rt Hon Herbert William Bowden | 1966 | 1967 |
| Rt Hon George Morgan Thomson | August 1967 | October 1968 |