| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | 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 |
| Tregare | Wales | Monmouthshire | Monmouth | churchyard | Yes | Ancient 4m-5m | View On Map |
| Tregaron: Argoed-fawr | Wales | Ceredigion | Lampeter | former religious site | No | Lost | View On Map |
| Trelowarren | England | Cornwall | Helston | garden | No | Notable | View On Map |
| 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 |
| Trevethin | Wales | Monmouthshire | Pontypool | churchyard | Yes | Lost | View On Map |
| Trimpley Reservoir | England | Worcestershire | Kidderminster | garden | No | Ancient 4m-5m | View On Map |
| Triqueville | France | Eure - Normandie | Pont Audemer | churchyard | Yes | Ancient 5m-7m | View On Map |
| Troed-yr-harn | Wales | Powys | Brecon | footpath/road | Yes | Notable | View On Map |
| Trostrey | Wales | Monmouthshire | Usk | churchyard | Yes | Ancient 5m-7m | View On Map |
| Trottiscliffe | England | Kent | Sevenoaks | churchyard | Yes | Ancient 4m-5m | View On Map |
| Trowbridge | England | Wiltshire | Bradford-on-Avon | churchyard | Yes | Notable | View On Map |
| Trull | England | Somerset | Taunton | churchyard | Yes | Ancient 4m-5m | View On Map |
| Trungy | France | Calvados - Normandie | Bayeux | churchyard | Yes | Ancient 4m-5m | View On Map |