| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Norton Court | England | Kent | Sittingbourne | churchyard | Yes | Ancient 7m+ | View On Map |
| Norton Lindsey | England | Warwickshire | Warwick | churchyard | Yes | Notable | View On Map |
| Norton Malreward | England | Somerset | Bristol | churchyard | Yes | Ancient 4m-5m | View On Map |
| Norton sub Hamdon | England | Somerset | Yeovil | churchyard | Yes | Ancient 4m-5m | View On Map |
| Notgrove | England | Gloucestershire | Cheltenham | churchyard | Yes | Lost | View On Map |
| Notre- Dame-de- Courson | France | Calvados - Normandie | Lisieux | churchyard | Yes | Ancient 4m-5m | View On Map |
| Nunney | England | Somerset | Frome | field | No | Lost | View On Map |
| Nupend Wood | England | Herefordshire | Hereford | woodland | Yes | Notable | View On Map |
| Nurstead | England | Kent | Gravesend | churchyard | Yes | Lost | View On Map |
| Nuthall | England | Nottinghamshire | Nottingham | churchyard | Yes | Notable | View On Map |
| Nutley Down | England | Hampshire | Basingstoke | woodland | No | Ancient 4m-5m, Ancient 5m-7m | View On Map |
| Oakclose Plantation Morestead | England | Hampshire | Winchester | boundary | Yes | Notable | View On Map |
| Oakhills Coppice SSSI – Long Crichel | England | Dorset | Blandford Forum | woodland | No | Ancient 5m-7m | View On Map |
| Oakley Copse | England | Wiltshire | Wilton | woodland | No | Ancient 4m-5m | View On Map |
| Oceno | Spain | Asturias | Cangas de Onis | churchyard | Yes | Notable | View On Map |
| Ockham | England | Surrey | Guildford | garden | No | Ancient 4m-5m | View On Map |
| Ockley | England | Surrey | Horsham | woodland | Yes | Ancient 4m-5m | View On Map |
| Octeville l’ Avenel | France | Manche - Normandie | Quettehou | churchyard | Yes | Ancient 5m-7m | View On Map |
| Odcombe | England | Somerset | Yeovil | churchyard | Yes | Ancient 5m-7m | View On Map |
| Odstock | England | Wiltshire | Salisbury | footpath/road | Yes | Notable | View On Map |