| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Totteridge | England | Greater London | Barnet | churchyard | Yes | Ancient 7m+ | View On Map |
| Tourner Bury Hill Fort | England | Hampshire | Havant | historic site | No | Lost | View On Map |
| Tourville-sur- Odon | France | Calvados - Normandie | Caen | churchyard | Yes | Notable | View On Map |
| Touville | France | Eure - Normandie | Bourg-Achard | churchyard | Yes | Ancient 5m-7m | View On Map |
| Towcester | England | Northamptonshire | Northampton | churchyard | Yes | Notable | View On Map |
| Townend – National Trust | England | Cumbria | Ambleside | garden | Yes | Lost, Notable | View On Map |
| Traquair House | Scotland | Scottish Borders | Innerleithin | garden | Yes | Notable | View On Map |
| Trealy | Wales | Monmouthshire | Monmouth | woodland | No | Ancient 5m-7m | View On Map |
| Tredunnock | Wales | Monmouthshire | Newport | churchyard | Yes | Ancient 5m-7m | View On Map |
| Trefeglwys | Wales | Powys | Newtown | churchyard | Yes | Ancient 4m-5m, Ancient 5m-7m, Ancient 7m+ | View On Map |
| Trefenty (Llanfihangel Abercowin) | Wales | Carmarthenshire | St Clears | former religious site | Yes | Ancient 5m-7m | View On Map |
| Trefilan | Wales | Ceredigion | Lampeter | churchyard | Yes | Ancient 5m-7m | View On Map |
| Trefriw | Wales | Conwy | Betws-y-Coed | churchyard | Yes | Lost | View On Map |
| Tréfumel | France | Cotes d' Armor - Bretagne | Dinan | churchyard | Yes | Ancient 5m-7m | View On Map |
| Tregaron: Argoed-fawr | Wales | Ceredigion | Lampeter | former religious site | No | Lost | View On Map |
| Trelowarren | England | Cornwall | Helston | garden | No | Notable | No Map Data |
| Trelystan | Wales | Powys | Welshpool | churchyard | Yes | Ancient 5m-7m, Notable | View On Map |
| Tremeirchion | Wales | Denbighshire | St Asaph | churchyard | Yes | Ancient 4m-5m | View On Map |
| Trent | England | Dorset | Yeovil | churchyard | Yes | Ancient 4m-5m | View On Map |
| Treuddyn | Wales | Flintshire | Mold | churchyard | Yes | Notable | View On Map |