| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Cormolain | France | Calvados - Normandie | Saint - Lô | churchyard | Yes | Ancient 4m-5m | View On Map |
| Cornwood | England | Devon | Plymouth | churchyard | Yes | Ancient 4m-5m | View On Map |
| Corsley | England | Wiltshire | Frome | churchyard | Yes | Lost | View On Map |
| Cottun | France | Calvados - Normandie | Bayeux | churchyard | Yes | Lost | View On Map |
| Coulonces | France | Calvados - Normandie | Vire | churchyard | Yes | Ancient 7m+, Notable | View On Map |
| Courson | France | Calvados - Normandie | Vire | churchyard | Yes | Ancient 5m-7m | View On Map |
| Cowbridge | Wales | Glamorgan | Bridgend | churchyard | Yes | Notable | View On Map |
| Cowdray Park | England | Sussex - West | Midhurst | parkland | No | Ancient 4m-5m, Notable | View On Map |
| Coxbench Hall | England | Derbyshire | Derby | garden | No | Ancient 4m-5m, Ancient 5m-7m | View On Map |
| Coychurch (Llangrallo) | Wales | Bridgend | Bridgend | churchyard | Yes | Notable | View On Map |
| Craddock Land – Hentland | England | Herefordshire | Ross-on-Wye | field | Yes | Lost | View On Map |
| Cradley | England | Herefordshire | Great Malvern | churchyard | Yes | Ancient 4m-5m, Ancient 5m-7m | View On Map |
| Craig-y-Dorth (side of road) | Wales | Monmouthshire | Monmouth | footpath/road | Yes | Notable | View On Map |
| Craig-y-Dorth (woodland) | Wales | Monmouthshire | Monmouth | woodland | No | Ancient 4m-5m | View On Map |
| Craigallian | Scotland | Stirling | Glasgow | garden | Yes | Ancient 4m-5m | View On Map |
| Craigends | Scotland | Renfrewshire | Glasgow | estate | Yes | Ancient 7m+, Notable | View On Map |
| Craigmillar Castle | Scotland | City of Edinburgh | Edinburgh | castle | Yes | Notable | View On Map |
| Craignethan Castle | Scotland | Lanarkshire | Lanark | castle | Yes | Notable | View On Map |
| Cranborne – churchyard | England | Dorset | Verwood | churchyard | Yes | Ancient 4m-5m, Ancient 5m-7m | View On Map |
| Cranborne – Fleur de Lys Inn (near) | England | Dorset | Verwood | garden | No | Notable | View On Map |