| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Cilwern | Wales | Carmarthenshire | Llandybie | garden | No | Lost | View On Map |
| Cilycwm | Wales | Carmarthenshire | Llandovery | churchyard | Yes | Ancient 5m-7m, Ancient 7m+, Lost | View On Map |
| Cissbury Ring | England | Sussex - West | Worthing | historic site | Yes | Notable | View On Map |
| Claines | England | Worcestershire | Worcester | churchyard | Yes | Lost | View On Map |
| Clanfield | England | Hampshire | Petersfield | churchyard | Yes | Ancient 4m-5m | View On Map |
| Clapgate Gill | England | Yorkshire - North | Richmond | upland | No | Ancient 4m-5m, Notable | View On Map |
| Claverley | England | Shropshire | Bridgnorth | churchyard | Yes | Ancient 7m+ | View On Map |
| Claverton Manor | England | Somerset | Bath | garden | Yes | Ancient 5m-7m, Notable | View On Map |
| Clayhidon | England | Devon | Wellington | churchyard | Yes | Ancient 4m-5m | View On Map |
| Clayton Manor Gardens | England | Sussex - West | Brighton | garden | No | Ancient 5m-7m | View On Map |
| Clearbury Down | England | Wiltshire | Salisbury | field | Yes | Ancient 4m-5m | View On Map |
| Cleckheaton | England | Yorkshire - West | Bradford | churchyard | Yes | Lost | View On Map |
| Clee St Margaret | England | Shropshire | Ludlow | churchyard | Yes | Ancient 4m-5m | View On Map |
| Cleeve Prior | England | Worcestershire | Evesham | churchyard | Yes | Notable | View On Map |
| Cleeve Prior Manor | England | Worcestershire | Evesham | garden | No | Notable | View On Map |
| Clehonger | England | Herefordshire | Hereford | churchyard | Yes | Lost, Notable | View On Map |
| Cleobury North | England | Shropshire | Bridgnorth | churchyard | Yes | Notable | View On Map |
| Clevedon | England | Somerset | Bristol | footpath/road | Yes | Notable | View On Map |
| Cliffe Pypard | England | Wiltshire | Swindon | churchyard | Yes | Ancient 5m-7m | View On Map |
| Clifford | England | Herefordshire | Hay-on-Wye | churchyard | Yes | Lost, Notable | View On Map |