| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Ashmore | England | Dorset | Shaftesbury | churchyard | Yes | Notable | View On Map |
| Ashow | England | Warwickshire | Kenilworth | churchyard | Yes | Ancient 4m-5m | View On Map |
| Ashprington – Sharpham House | England | Devon | Totnes | garden | Yes | Ancient 5m-7m | View On Map |
| Ashridge House | England | Hertfordshire | Berkhamsted | garden | Yes | Notable | View On Map |
| Ashtead | England | Surrey | Leatherhead | churchyard | Yes | Ancient 5m-7m | View On Map |
| Ashton-under-Hill | England | Worcestershire | Evesham | churchyard | Yes | Ancient 4m-5m | View On Map |
| Ashurst – Burrs Wood | England | Kent | Royal Tunbridge Wells | woodland | Yes | Notable | View On Map |
| Ashurst – churchyard | England | Kent | Royal Tunbridge Wells | churchyard | Yes | Ancient 4m-5m | View On Map |
| Askerswell | England | Dorset | Bridport | historic site | No | Ancient 7m+ | View On Map |
| Assolas House | Ireland | Co. Cork | Kanturk | former religious site | No | Ancient 4m-5m, Ancient 5m-7m | View On Map |
| Astbury | England | Cheshire | Congleton | churchyard | Yes | Ancient 7m+ | View On Map |
| Asthall (Leigh) | England | Oxfordshire | Witney | churchyard | Yes | Lost | View On Map |
| Astley – Dam House Yew | England | Greater Manchester | Manchester | garden | Yes | Ancient 4m-5m | View On Map |
| Astley Castle | England | Warwickshire | Nuneaton | historic site | No | Ancient 4m-5m | View On Map |
| Aston Botterell – churchyard | England | Shropshire | Bridgnorth | churchyard | Yes | Lost | View On Map |
| Aston Botterell – field | England | Shropshire | Bridgnorth | field | Yes | Ancient 4m-5m | View On Map |
| Aston le Walls | England | Northamptonshire | Banbury | churchyard | Yes | Ancient 5m-7m | View On Map |
| Aston Rowant – Beacon Hill | England | Oxfordshire | Watlington | woodland | Yes | Notable | View On Map |
| Atworth | England | Wiltshire | Chippenham | churchyard | Yes | Notable | View On Map |
| Ault Hucknall | England | Derbyshire | Mansfield | churchyard | Yes | Notable | View On Map |