| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Althorp | England | Northamptonshire | Northampton | parkland | No | Ancient 5m-7m | View On Map |
| Alton – Barton End | England | Hampshire | Basingstoke | garden | Yes | Ancient 4m-5m | View On Map |
| Alton Barnes | England | Wiltshire | Devizes | churchyard | Yes | Ancient 4m-5m | View On Map |
| Alton Pancras | England | Dorset | Cerne Abbas | churchyard | Yes | Ancient 4m-5m | View On Map |
| Alton Priors | England | Wiltshire | Marlborough | churchyard | Yes | Ancient 7m+ | View On Map |
| Alvechurch | England | Worcestershire | Bromsgrove | churchyard | Yes | Ancient 5m-7m | View On Map |
| Alveston (Rudgeway) | England | Gloucestershire | Bristol | former religious site | No | Ancient 5m-7m | View On Map |
| Amayé-sur-Orne | France | Calvados - Normandie | Caen | churchyard | Yes | Notable | View On Map |
| Amberley | England | Sussex - West | Arundel | churchyard | Yes | Ancient 5m-7m | View On Map |
| Amfreville | France | Manche - Normandie | Sainte-Mère-Église | churchyard | Yes | Ancient 4m-5m | View On Map |
| Ampfield Wood | England | Hampshire | Winchester | woodland | Yes | Ancient 4m-5m, Notable | View On Map |
| Ampney Crucis | England | Gloucestershire | Cirencester | churchyard | Yes | Notable | View On Map |
| Angersleigh | England | Somerset | Taunton | churchyard | Yes | Ancient 4m-5m | View On Map |
| Angerville – l-Orcher | France | Seine-Maritime - Normandie | Le Havre | churchyard | Yes | Ancient 4m-5m | View On Map |
| Angmering | England | Sussex - West | Arundel | churchyard | Yes | Ancient 5m-7m | View On Map |
| Ankerwyke | England | Berkshire | Staines | former religious site | Yes | Ancient 7m+ | View On Map |
| Ansford | England | Somerset | Castle Cary | churchyard | Yes | Notable | View On Map |
| Antrim Castle | Ireland | Co. Antrim | Antrim | historic site | Yes | Ancient 4m-5m | View On Map |
| Apley Castle | England | Shropshire | Telford | parkland | Yes | Ancient 4m-5m | View On Map |
| Appin House Farm | Scotland | Argyll and Bute | Oban | estate | No | Notable | View On Map |