- Tain Burghs 1708-1832
- Tamworth 1997-
- Tamworth 1660-1945
- Tatton 1983-
- Taunton 1660-
- Tavistock 1660-1974
- Tayside North 1983-2005
- Teesside Middlesbrough 1974-1983
- Teesside Redcar 1974-1983
- Teesside Stockton 1974-1983
- Teesside Thornaby 1974-1983
- Teignbridge 1983-
- Telford 1997-
- Tewkesbury 1997-
- Tewkesbury 1660-1918
- Thanet East 1974-1983
- Thanet North 1983-
- Thanet South 1983-
- Thanet West 1974-1983
- Thetford 1660-1868
- Thirsk 1660-1885
- Thirsk and Malton 1885-1983
- Thornbury 1885-1950
- Thurrock 1918-
- Tipperary 1832-1885
- Tipperary East 1885-1922
- Tipperary Mid 1885-1922
- Tipperary North 1885-1922
- Tipperary South 1885-1922
- Tiverton 1660-1997
- Tiverton and Honiton 1997-
- Tonbridge 1918-1974
- Tonbridge and Malling 1974-
- Tooting 1983-
- Torbay 1974-
- Torfaen 1983-
- Torquay 1885-1974
- Torrington 1950-1974
- Totnes 1660-1868
- Totnes 1885-
- Tottenham 1983-
- Tottenham 1950-1974
- Tottenham 1885-1918
- Tottenham North 1918-1950
- Tottenham South 1918-1950
- Tower Hamlets 1832-1885
- Tower Hamlets Bethnal Green and Bow 1974-1983
- Tower Hamlets Bow and Bromley 1885-1918
- Tower Hamlets Limehouse 1885-1918
- Tower Hamlets Mile End 1885-1918
- Tower Hamlets Poplar 1885-1918
- Tower Hamlets St George 1885-1918
- Tower Hamlets Stepney 1885-1918
- Tower Hamlets Stepney and Poplar 1974-1983
- Tower Hamlets Whitechapel 1885-1918
- Tralee 1802-1885
- Tregony 1660-1832
- Truro 1950-1997
- Truro 1660-1918
- Truro and St Austell 1997-
- Tunbridge 1885-1918
- Tunbridge Wells 1983-
- Tweeddale, Ettrick and Lauderdale 1983-2005
- Twickenham 1918-
- Tyne Bridge 1983-
- Tynemouth 1885-
- Tynemouth and North Shields 1832-1885
- Tyneside 1885-1918
- Tyneside North 1997-
- Tyrone 1802-1885
- Tyrone East 1885-1918
- Tyrone Mid 1885-1918
- Tyrone North 1885-1918
- Tyrone North East 1918-1922
- Tyrone North West 1918-1922
- Tyrone South 1885-1922
- Tyrone West 1997-
2,145 constituencies in total