| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Cuissai | France | Orne - Normandie | Alencon | churchyard | Yes | Ancient 4m-5m | View On Map |
| Culbone | England | Devon | Minehead | churchyard | Yes | Notable | View On Map |
| Cullompton | England | Devon | Exeter | churchyard | Yes | Lost, Notable | View On Map |
| Culm Davy | England | Devon | Wellington | churchyard | Yes | Ancient 5m-7m | View On Map |
| Culmstock | England | Devon | Wellington | churchyard | Yes | Notable | View On Map |
| Curraghchase | Ireland | Co. Limerick | Limerick | woodland | Yes | Notable | View On Map |
| Curry Mallet | England | Somerset | Ilminster | churchyard | Yes | Ancient 4m-5m | View On Map |
| Cusop | England | Herefordshire | Hay-on-Wye | churchyard | Yes | Ancient 4m-5m, Ancient 5m-7m, Ancient 7m+ | View On Map |
| Cutcombe | England | Somerset | Minehead | churchyard | Yes | Ancient 5m-7m | View On Map |
| Cwm | Wales | Denbighshire | St Asaph | churchyard | Yes | Lost | View On Map |
| Cwm Penllwynog – near Wenvoe | Wales | Glamorgan | Cardiff | woodland | Yes | Ancient 4m-5m | View On Map |
| Cwm-Hydfer | Wales | Powys | Llandovery | field | No | Notable | View On Map |
| Cwmbach Llechryd | Wales | Powys | Builth Wells | hedge | Yes | Notable | View On Map |
| Cwmcarvan | Wales | Monmouthshire | Monmouth | churchyard | Yes | Ancient 5m-7m | View On Map |
| Cwmdu | Wales | Powys | Abergavenny | churchyard | Yes | Notable | View On Map |
| Cwmmau farmhouse – Brilley | England | Herefordshire | Kington | garden | No | Ancient 5m-7m | View On Map |
| Cwmyoy | Wales | Monmouthshire | Abergavenny | churchyard | Yes | Lost | View On Map |
| Cyffylliog | Wales | Denbighshire | Ruthin | churchyard | Yes | Ancient 5m-7m, Ancient 7m+, Notable | View On Map |
| Dalhousie Castle | Scotland | Midlothian | Edinburgh | castle | No | Ancient 4m-5m | View On Map |
| Dalswinton | Scotland | Dumfries and Galloway | Dumfries | parkland | Yes | Ancient 4m-5m | View On Map |