| Tottenham North (1918 - 1950) |
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| Tottenham South (1918 - 1950) |
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| Twickenham (1918) |
Full name (in Craig 3) Middlesex, Twickenham. Craig (3) 245 from 1945 revision. |
| Tyrone North East (1918 - 1922) |
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| Tyrone North West (1918 - 1922) |
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| University of Wales (1918 - 1950) |
Non-geographic constituency. |
| Wallasey (1918) |
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| Wallsend (1918 - 1997) |
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| Walthamstow East (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Walthamstow West (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Wandsworth Balham and Tooting (1918 - 1950) |
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| Wandsworth Central (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Wandsworth Clapham (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Wandsworth Putney (1918 - 1983) |
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| Wandsworth Streatham (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Waterford [county] (1918 - 1922) |
Constituency of same name also existed 1832-1885 |
| Waterloo (1918 - 1950) |
Full name (in Craig 3) Lancashire, Waterloo |
| Wellingborough (1918 - 2024) |
Full name (in Craig 3,4) Northamptonshire (and the Soke of Peterborough), Wellingborough |
| Wembley North (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Wembley South (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Wentworth (1918 - 2010) |
Full name (in Craig 3) Yorkshire (West Riding), Wentworth |
| Western Isles (1918 - 2005) |
Full name (in Craig 3,4) Inverness-shire and Ross and Cromarty, Western Isles |
| 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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