| Stoke-on-Trent Stoke (1918 - 1950) |
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| Stone (1918 - 1950) |
Full name (in Craig 3) Staffordshire, Stone. Constituency of same name reformed 1997. |
| Stourbridge (1918 - 1950) |
Full name (in Craig 3) Worcestershire, Stourbridge. Constituency of same name reformed 1997. |
| St Pancras South East (1918 - 1950) |
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| St Pancras South West (1918 - 1950) |
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| Sudbury (1885 - 1950) |
Full name (in Craig 2,3) Suffolk (West), Sudbury. Constituency of same name also existed 1832-1844. |
| Sunderland (1832 - 1950) |
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| Surrey Eastern (1832 - 1950) |
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| Thornbury (1885 - 1950) |
Full name (in Craig 2,3) Gloucestershire, Thornbury |
| Tottenham North (1918 - 1950) |
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| Tottenham South (1918 - 1950) |
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| University of Wales (1918 - 1950) |
Non-geographic constituency. |
| Wandsworth Balham and Tooting (1918 - 1950) |
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| Wansbeck (1885 - 1950) |
Full name (in Craig 2,3) Northumberland, Wansbeck. Constituency of same name reformed in 1983. |
| Waterloo (1918 - 1950) |
Full name (in Craig 3) Lancashire, Waterloo |
| West Ham Plaistow (1918 - 1950) |
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| West Ham Silvertown (1918 - 1950) |
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| West Ham Stratford (1918 - 1950) |
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| West Ham Upton (1918 - 1950) |
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| Westminster Abbey (1918 - 1950) |
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| Westminster St George's (1918 - 1950) |
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| Wolverhampton Bilston (1918 - 1950) |
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| Wolverhampton East (1885 - 1950) |
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| Wolverhampton West (1885 - 1950) |
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| Woodbridge (1885 - 1950) |
Full name (in Craig 2,3) Suffolk (East), Woodbridge. Also known as Suffolk South East. |