| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Monnington on Wye | England | Herefordshire | Hereford | churchyard | Yes | Ancient 4m-5m | View On Map |
| Monnington Walk | England | Herefordshire | Hereford | planted avenue | Yes | Notable | View On Map |
| Montcuit | France | Manche - Normandie | St Lô | churchyard | Yes | Ancient 7m+ | View On Map |
| Montgardon | France | Manche - Normandie | churchyard | Yes | Ancient 5m-7m | View On Map | |
| Monyash | England | Derbyshire | Buxton | churchyard | Yes | Ancient 4m-5m | View On Map |
| Moore Abbey – Monasterevin | Ireland | Co. Kildare | Dublin | historic site | Yes | Ancient 5m-7m, Notable | View On Map |
| Moot Garden – Downton | England | Wiltshire | Salisbury | parkland | Yes | Notable | View On Map |
| Morden Hall Park | England | Greater London | London | parkland | Yes | Ancient 4m-5m | View On Map |
| Mordiford | England | Herefordshire | Hereford | churchyard | Yes | Notable | View On Map |
| More | England | Shropshire | Bishop's Castle | churchyard | Yes | Notable | View On Map |
| Moreton | England | Dorset | Wool | churchyard | Yes | Lost | View On Map |
| Moreton Jeffries | England | Herefordshire | Hereford | churchyard | Yes | Notable | View On Map |
| Moreton-on-Lugg | England | Herefordshire | Hereford | footpath/road | Yes | Notable | View On Map |
| Morland | England | Cumbria | Penrith | churchyard | Yes | Ancient 4m-5m | View On Map |
| Morley | England | Yorkshire - West | Leeds | churchyard | Yes | Lost | View On Map |
| Mortonhall | Scotland | Edinburgh | Edinburgh | estate | No | Notable | View On Map |
| Mote Park – Maidstone | England | Kent | Maidstone | parkland | Yes | Ancient 4m-5m, Notable | View On Map |
| Motleys Copse – Rowlands Castle | England | Hampshire | Horndean | castle | No | Ancient 4m-5m | View On Map |
| Mottisfont – garden | England | Hampshire | Winchester | boundary | No | Ancient 5m-7m | View On Map |
| Mottisfont – Great Copse | England | Hampshire | Winchester | woodland | Yes | Ancient 5m-7m | View On Map |