| Ruislip Northwood (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). Constituency of same name reformed 1983. |
| Runcorn (1950 - 1983) |
Full name (in Craig 4) Cheshire, Runcorn |
| Salford East (1950 - 1997) |
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| Sheffield, Heeley (1950) |
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| Sheffield, Neepsend (1950 - 1955) |
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| Shoreditch and Finsbury (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Somerset North (1950 - 1983) |
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| Southampton, Itchen (1950) |
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| Southampton, Test (1950) |
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| South Angus (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). Full name (in Craig 4) Aberdeenshire and Kincardineshire, South Angus |
| Southend East (1950 - 1997) |
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| Southend West (1950 - 2024) |
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| South Fylde (1950 - 1983) |
Full name (in Craig 4) Lancashire, South Fylde |
| Southgate (1950 - 1983) |
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| Southwark (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). Constituency of same name also existed 1832-1885. |
| Stafford and Stone (1950 - 1983) |
Full name (in Craig 4) Staffordshire, Stafford and Stone |
| Stepney (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Stirling and Falkirk Burghs (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Stockport North (1950 - 1983) |
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| Stockport South (1950 - 1983) |
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| Stoke Newington and Hackney North (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Stoke-on-Trent Central (1950) |
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| Stoke-on-Trent North (1950) |
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| Stoke-on-Trent South (1950) |
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| Stratford-on-Avon (1950) |
Seat of same name existed 1885-1918. |