| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Myndtown – Pilgrim’s Route(2) | England | Shropshire | Church Stretton | footpath/road | Yes | Ancient 5m-7m | View On Map |
| Myndtown – Pilgrim’s Route(3) | England | Shropshire | Church Stretton | footpath/road | Yes | Ancient 5m-7m | View On Map |
| Mynyddislwyn | Wales | Caerphilly | Caerphilly | churchyard | Yes | Ancient 4m-5m, Ancient 5m-7m, Lost | View On Map |
| Nab Scar | England | Cumbria | Ambleside | upland | Yes | Notable | View On Map |
| Nackington | England | Kent | Canterbury | churchyard | Yes | Ancient 4m-5m | View On Map |
| Nailsea – Christchurch | England | Somerset | Bristol | churchyard | Yes | Notable | View On Map |
| Nailsea – Holy Trinity | England | Somerset | Bristol | churchyard | Yes | Ancient 4m-5m | View On Map |
| Nan Trodds Hill | England | Hampshire | Winchester | woodland | No | Notable | View On Map |
| Nannerch | Wales | Flintshire | Holywell | churchyard | Yes | Ancient 5m-7m | View On Map |
| Nant Peris | Wales | Gwynedd | Caernarfon | churchyard | Yes | Ancient 4m-5m | View On Map |
| Nant-ddu | Wales | Powys | Merthyr Tydfil | former religious site | Yes | Ancient 4m-5m, Notable | View On Map |
| Nantglyn | Wales | Denbighshire | Ruthin | churchyard | Yes | Ancient 5m-7m, Ancient 7m+ | View On Map |
| Nantmawr – Jones’s Rough | England | Shropshire | Oswestry | woodland | Yes | Notable | View On Map |
| Nantmel | Wales | Powys | Rhayader | churchyard | Yes | Ancient 4m-5m, Ancient 5m-7m, Ancient 7m+ | View On Map |
| Nap Wood | England | Sussex - West | Wadhurst | woodland | Yes | Ancient 4m-5m, Notable | View On Map |
| Naseby | England | Northamptonshire | Market Harborough | garden | No | Notable | View On Map |
| Naseby church | England | Northamptonshire | Market Harborough | churchyard | Yes | Ancient 4m-5m | View On Map |
| Nash | Wales | Pembrokeshire | Pembroke | churchyard | Yes | Ancient 5m-7m | View On Map |
| Naworth Castle | England | Cumbria | Carlisle | historic site | No | Ancient 5m-7m | View On Map |
| Necarne Castle | Ireland | Co. Fermanagh | Enniskillen | garden | Yes | Ancient 4m-5m | View On Map |