| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Mayfield – Blacksmith’s Forge | England | Sussex - East | Crowborough | footpath/road | Yes | Lost | View On Map |
| Mayfield – Horleigh Green | England | Sussex - East | No | Notable | View On Map | ||
| Medmenham | England | Buckinghamshire | Marlow | churchyard | Yes | Lost | View On Map |
| Megginch Castle | Scotland | Perth and Kinross | Perth | castle | Yes | Ancient 4m-5m | View On Map |
| Meidrim | Wales | Carmarthenshire | Carmarthen | churchyard | Yes | Lost | View On Map |
| Meifod | Wales | Powys | Welshpool | churchyard | Yes | Notable | View On Map |
| Melbourne Hall – Derbyshire | England | Derbyshire | Derby | garden | Yes | Notable | View On Map |
| Melbury Sampford | England | Dorset | Yeovil | churchyard | Yes | Ancient 5m-7m | View On Map |
| Melcombe Bingham | England | Dorset | Milton Abbas | garden | No | Notable | View On Map |
| Melksham | England | Wiltshire | Bath | churchyard | Yes | Notable | View On Map |
| Melliker Green Meopham | England | Kent | Rochester | Yes | Ancient 4m-5m | View On Map | |
| Mells | England | Somerset | Frome | churchyard | Yes | Ancient 4m-5m | View On Map |
| Melplash | England | Dorset | Bridport | churchyard | Yes | Notable | View On Map |
| Meluerda | Spain | Asturias | Ribadesella | churchyard | Yes | Notable | View On Map |
| Melverley | England | Shropshire | Welshpool | churchyard | Yes | Ancient 4m-5m | View On Map |
| Menithwood | England | Worcestershire | Kidderminster | woodland | No | Ancient 4m-5m | View On Map |
| Merbach Hill | England | Herefordshire | Hay-on-Wye | woodland | No | Ancient 4m-5m | View On Map |
| Mercombe Wood | England | Gloucestershire | Cheltenham | woodland | No | Ancient 4m-5m | View On Map |
| Merdon – Dores Lane | England | Hampshire | Winchester | hedge | No | Ancient 5m-7m | View On Map |
| Merdon Castle | England | Hampshire | Winchester | castle | No | Ancient 4m-5m, Ancient 5m-7m, Ancient 7m+ | View On Map |