| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Bitton | England | Gloucestershire | Bristol | churchyard | Yes | Notable | View On Map |
| Black Wood – near Micheldever | England | Hampshire | Winchester | woodland | Yes | Ancient 4m-5m, Ancient 5m-7m | View On Map |
| Blackburn | England | Lancashire | Blackburn | field | Yes | Ancient 4m-5m | View On Map |
| Blackdown – nr Upham | England | Hampshire | Bishop's Waltham | woodland | No | Ancient 4m-5m, Ancient 5m-7m, Notable | View On Map |
| Blackmoor | England | Hampshire | Petersfield | churchyard | Yes | Notable | View On Map |
| Blackwell | England | Derbyshire | Mansfield | churchyard | Yes | Lost | View On Map |
| Blaenavon | Wales | Monmouthshire | Abergavenny | churchyard | Yes | Notable | View On Map |
| Blaina (formerly Aberystruth) | Wales | Blaenau Gwent | Ebbw Vale | churchyard | No | Lost | View On Map |
| Blaisdon – Picks Copse | England | Gloucestershire | Cinderford | woodland | Yes | Ancient 4m-5m, Ancient 5m-7m, Notable | View On Map |
| Blarcreen House – Inveresragan | Scotland | Argyll and Bute | Oban | estate | No | Ancient 4m-5m | View On Map |
| Blarney Castle | Ireland | Co. Cork | Cork | castle | Yes | Ancient 4m-5m | View On Map |
| Bleddfa | Wales | Powys | Knighton | churchyard | Yes | Ancient 4m-5m, Notable | View On Map |
| Blendworth | England | Hampshire | Havant | churchyard | Yes | Notable | View On Map |
| Blewbury | England | Oxfordshire | Oxford | churchyard | Yes | Ancient 5m-7m | View On Map |
| Blickling | England | Norfolk | Aylsham | churchyard | Yes | Ancient 5m-7m | View On Map |
| Blickling Hall Estate | England | Norfolk | Aylsham | garden | Yes | Notable | View On Map |
| Blitterlees | England | Cumbria | Silloth | garden | No | Notable | View On Map |
| Blore Ray | England | Staffordshire | Ashbourne | churchyard | Yes | Lost | View On Map |
| Blosville | France | Calvados - Normandie | Sainte-Mère-Église | churchyard | Yes | Ancient 4m-5m, Notable | View On Map |
| Blunsdon St Andrew | England | Wiltshire | Swindon | churchyard | Yes | Notable | View On Map |