| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Seale | England | Surrey | Farnham | footpath/road | No | Ancient 4m-5m | View On Map |
| Seal | England | Kent | Sevenoaks | churchyard | Yes | Ancient 5m-7m | View On Map |
| Seagrave | England | Leicestershire | Loughborough | churchyard | Yes | Notable | View On Map |
| Screveton | England | Nottinghamshire | Newark-on-Trent | churchyard | Yes | V - con | View On Map |
| Scotney Castle | England | Kent | Royal Tunbridge Wells | woodland | Yes | Notable | View On Map |
| Scone Palace – Moot Hill | Scotland | Perth and Kinross | Perth | historic site | Yes | Notable | View On Map |
| Savernake Forest | England | Wiltshire | Marlborough | woodland | Yes | Notable | View On Map |
| Sarnesfield – A480 | England | Herefordshire | Hereford | footpath/road | Yes | Ancient 5m-7m | View On Map |
| Sarnesfield | England | Herefordshire | Hereford | churchyard | Yes | Ancient 5m-7m | View On Map |
| Sapperton | England | Gloucestershire | Cirencester | planted avenue | Yes | Ancient 4m-5m, Notable | View On Map |
| Santibanez de la Fuente | Spain | Asturias | Ujo | churchyard | Yes | Notable | View On Map |
| Santa Coloma | Spain | Asturias | Grandas de Salim | churchyard | Yes | Ancient 5m-7m | View On Map |
| Sansaw Estate | England | Shropshire | Shrewsbury | woodland | No | Ancient 5m-7m | View On Map |
| Sandwich | England | Kent | Deal | historic site | Yes | Ancient 4m-5m | View On Map |
| Sandiacre | England | Derbyshire | Nottingham | churchyard | Yes | Notable | View On Map |
| Sandhurst | England | Berkshire | Camberley | churchyard | Yes | Ancient 4m-5m | View On Map |
| Sandford Orcas | England | Dorset | Sherbourne | churchyard | Yes | Lost | View On Map |
| Sandford – on – Thames | England | Oxfordshire | Oxford | churchyard | Yes | Notable | View On Map |
| Sanderstead – Mitchley Wood | England | Surrey | Croydon | footpath/road | Yes | Notable | View On Map |
| Sanderstead | England | Greater London | Croydon | churchyard | Yes | Lost | View On Map |