| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Merdon Castle | England | Hampshire | Winchester | castle | No | Ancient 4m-5m, Ancient 5m-7m, Ancient 7m+ | View On Map |
| Mere | England | Wiltshire | Wincanton | churchyard | Yes | Ancient 5m-7m | View On Map |
| Meriden | England | West Midlands | Coventry | churchyard | Yes | Ancient 4m-5m | View On Map |
| Mersham | England | Kent | Ashford | churchyard | Yes | Notable | View On Map |
| Merstham | England | Surrey | Reigate | churchyard | Yes | Ancient 4m-5m | View On Map |
| Merthyr Cynog | Wales | Powys | Brecon | churchyard | Yes | Ancient 4m-5m, Ancient 5m-7m, Ancient 7m+ | View On Map |
| Messing | England | Essex | Tiptree | churchyard | Yes | Notable | View On Map |
| Michaelchurch Escley | England | Herefordshire | Hay-on-Wye | churchyard | Yes | Notable | View On Map |
| Michaelchurch-on – Arrow | Wales | Powys | Kington | churchyard | Yes | Ancient 4m-5m, Ancient 5m-7m | View On Map |
| Michaelston-le-Pit | Wales | Glamorgan | Cardiff | churchyard | Yes | Ancient 7m+ | View On Map |
| Michaelston-super – Ely | Wales | Cardiff | Cardiff | churchyard | Yes | Ancient 5m-7m | View On Map |
| Michaelston-y- Fedw | Wales | Monmouthshire | Cardiff | churchyard | Yes | Ancient 5m-7m | View On Map |
| Micheldever | England | Hampshire | Winchester | churchyard | Yes | Notable | View On Map |
| Micheldever – Parish boundary | England | Hampshire | Winchester | boundary | No | Notable | View On Map |
| Michelham Priory | England | Sussex - East | Hailsham | garden | Yes | Ancient 5m-7m | View On Map |
| Mid Lavant | England | Sussex - West | Chichester | churchyard | Yes | Ancient 7m+ | View On Map |
| Middle Chinnock | England | Somerset | Crewkerne | churchyard | Yes | Ancient 4m-5m | View On Map |
| Middle Winterslow – Lower Noads Copse | England | Hampshire | Salisbury | woodland | No | Notable | View On Map |
| Middle Winterslow – Upper Noads Copse | England | Hampshire | Salisbury | woodland | Yes | Ancient 4m-5m | View On Map |
| Middlehope – Preens Barn | England | Shropshire | Church Stretton | footpath/road | Yes | Ancient 4m-5m | View On Map |