| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Gladestry – Yew Tree Bank | Wales | Powys | Kington | field | No | Ancient 4m-5m | View On Map |
| Glamis Castle | Scotland | Angus | Forfar / Dundee | parkland | Yes | Ancient 5m-7m | View On Map |
| Glasbury | Wales | Powys | Hay-on-Wye | churchyard | Yes | Ancient 4m-5m, Ancient 5m-7m, Notable | View On Map |
| Glasbury – lost church | Wales | Powys | Hay-on-Wye | churchyard | No | Lost | View On Map |
| Glascoed Meifod | Wales | Powys | Welshpool | garden | No | Notable | View On Map |
| Glascwm | Wales | Powys | Builth Wells | churchyard | Yes | Notable | View On Map |
| Glasgow – Kings Park | Scotland | Glasgow City | Glasgow | estate | Yes | Ancient 4m-5m | View On Map |
| Glasnevin | Ireland | Co. Dublin | Dublin | planted avenue | Yes | Notable | View On Map |
| Glebe House – Newcastle | Ireland | Dublin | Dublin | garden | No | Ancient 4m-5m | View On Map |
| Glen of Clab | Ireland | Co. Clare | Ballyvaghan | cliff | Yes | Notable | View On Map |
| Glen Prosen – Balnaboth Chapel | Scotland | Angus | Kirriemuir | former religious site | Yes | Notable | View On Map |
| Glencormac | Ireland | Co. Wicklow | Dublin/Wicklow | former religious site | Yes | Ancient 5m-7m | View On Map |
| Glendalough | Ireland | Co. Wicklow | Dublin | churchyard | Yes | View On Map | |
| Glenstal Abbey | Ireland | Limerick | Limerick | garden | Yes | Ancient 4m-5m | View On Map |
| Glenveagh Castle | Ireland | Co. Donegal | Letterkenny | estate | Yes | Ancient 4m-5m | View On Map |
| Glyn Ceiriog | Wales | Wrexham | Llangollen | churchyard | Yes | Ancient 5m-7m | View On Map |
| Glyncorrwg | Wales | Glamorgan | Neath | churchyard | Yes | Ancient 4m-5m, Ancient 5m-7m, LostNotable | View On Map |
| Glynde | England | Sussex - East | Lewes | churchyard | Yes | Lost | View On Map |
| Goathill | England | Dorset | Milborne Port | churchyard | Yes | Ancient 4m-5m | View On Map |
| Goathouse Copse – Forest of Bere | England | Hampshire | Fareham | woodland | No | Ancient 4m-5m | View On Map |