| Tower Hamlets Poplar (1885 - 1918) |
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| Tower Hamlets Stepney (1885 - 1918) |
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| Tower Hamlets St George (1885 - 1918) |
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| Tower Hamlets Whitechapel (1885 - 1918) |
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| Truro (1832 - 1918) |
Full name (in Craig 2,4) Cornwall, Truro. Constituency of same name also existed 1950-1997. |
| Tunbridge (1885 - 1918) |
Full name (in Craig 2) Kent, Tunbridge |
| Tyneside (1885 - 1918) |
Full name (in Craig 2) Northumberland, Tynside |
| Tyrone East (1885 - 1918) |
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| Tyrone Mid (1885 - 1918) |
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| Tyrone North (1885 - 1918) |
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| Walthamstow (1885 - 1918) |
Full name (in Craig 2) Essex, Walthamstow. Constituency of same name reformed 1983. |
| Wandsworth (1885 - 1918) |
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| Waterford East (1885 - 1918) |
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| Waterford West (1885 - 1918) |
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| Wellington [Shropshire] (1885 - 1918) |
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| Wellington [Somerset] (1885 - 1918) |
Full name (in Craig 2) Somerset, Wellington |
| West Ham North (1885 - 1918) |
Constituency of same name also existed 1950-1974¹. |
| West Ham South (1885 - 1918) |
Constituency of same name also existed 1950-1974¹ |
| Westmeath North (1885 - 1918) |
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| Westmeath South (1885 - 1918) |
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| Westminster (1832 - 1918) |
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| Whitby (1832 - 1918) |
Full name (in Craig 2) Yorkshire (North Riding), Whitby |
| Wick District of Burghs (1832 - 1918) |
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| Wigtownshire (1832 - 1918) |
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| Wilton (1832 - 1918) |
Full name (in Craig 2) Wiltshire, Wilton |