| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Aberhafesp | Wales | Powys | Newtown | churchyard | Yes | Ancient 5m-7m | View On Map |
| Abermule | Wales | Powys | Newtown | historic site | No | Ancient 5m-7m | View On Map |
| Aberyscir | Wales | Powys | Brecon | churchyard | Yes | Ancient 5m-7m | View On Map |
| Acton Beauchamp | England | Herefordshire | Bromyard | churchyard | Yes | Ancient 4m-5m, Ancient 7m+ | View On Map |
| Acton Burnell (boundary yews) | England | Shropshire | Shrewsbury | boundary | No | Ancient 7m+ | View On Map |
| Acton Burnell (Yew Tree Piece) | England | Shropshire | Shrewsbury | woodland | No | Ancient 4m-5m, Ancient 5m-7m, Notable | View On Map |
| Acton Round | England | Shropshire | Bridgnorth | footpath/road | Yes | Ancient 4m-5m, Notable | View On Map |
| Acton Scott | England | Shropshire | Church Stretton | churchyard | Yes | Ancient 5m-7m, Ancient 7m+ | View On Map |
| Adare – Desmond Castle | Ireland | Co. Limerick | Limerick | historic site | No | Notable | View On Map |
| Adare – St Nicholas church | Ireland | Co. Limerick | Limerick | churchyard | Yes | Notable | View On Map |
| Adare Manor | Ireland | Co. Limerick | Limerick | former religious site | Yes | Ancient 4m-5m | View On Map |
| Adderley | England | Shropshire | Market Drayton | churchyard | Yes | Ancient 5m-7m | View On Map |
| Addington – Greater London | England | Greater London | Croydon | churchyard | Yes | Ancient 5m-7m, Notable | View On Map |
| Addington – Kent | England | Kent | Maidstone | churchyard | Yes | Ancient 4m-5m | View On Map |
| Addington Park | England | Surrey | Croydon | parkland | No | Ancient 5m-7m | View On Map |
| Adlestrop | England | Gloucestershire | Stow on the Wold | churchyard | Yes | Ancient 5m-7m | View On Map |
| Adlington | England | Cheshire | Macclesfield | garden | No | Ancient 4m-5m | View On Map |
| Affpuddle | England | Dorset | Dorchester | churchyard | Yes | Ancient 4m-5m | View On Map |
| Albourne | England | Sussex - West | Burgess Hill | churchyard | Yes | Notable | View On Map |
| Albury – churchyard | England | Surrey | Guildford | churchyard | Yes | Ancient 5m-7m | View On Map |