| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Mitchel Troy | Wales | Monmouthshire | Monmouth | churchyard | Yes | Ancient 4m-5m | View On Map |
| Mobberley | England | Cheshire | Knutsford | churchyard | Yes | Notable | View On Map |
| Moccas – churchyard | England | Herefordshire | Hereford | churchyard | Yes | Ancient 4m-5m | View On Map |
| Moccas Court | England | Herefordshire | Hereford | parkland | Yes | Ancient 5m-7m | View On Map |
| Mochdre | Wales | Powys | Newtown | churchyard | Yes | Ancient 4m-5m | View On Map |
| Molash | England | Kent | Ashford | churchyard | Yes | Ancient 5m-7m, Ancient 7m+, Lost | View On Map |
| Monifieth-The Old Grange | Scotland | Angus | Dundee | garden | No | Notable | View On Map |
| Monketon | England | Kent | Faversham | former religious site | No | Ancient 4m-5m, Ancient 5m-7m, Notable | View On Map |
| Monks Horton (Horton Ct) | England | Kent | Folkestone | churchyard | Yes | Ancient 5m-7m | View On Map |
| Monkton Up Wimborne – near | England | Dorset | Cranborne | boundary | Yes | Ancient 5m-7m | View On Map |
| Monkton Up Wimborne – old Coach Road | England | Dorset | Cranborne | boundary | Yes | Ancient 4m-5m | View On Map |
| Monmouthshire – private location | Wales | Monmouthshire | footpath/road | No | Ancient 7m+ | 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 |