| Rt Hon Barbara Anne Castle | October 1964 | 23 December 1965 |
| Rt Hon Arthur George Bottomley | 11 August 1966 | 29 August 1967 |
| Rt Hon Judith Constance Mary Hart, Baroness Hart of South Lanark | October 1969 | June 1970 |
| Rt Hon Judith Constance Mary Hart, Baroness Hart of South Lanark | June 1974 | June 1975 |