| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Ibberton | England | Dorset | Blandford Forum | churchyard | Yes | Lost | View On Map |
| Ibstone | England | Buckinghamshire | High Wycombe | churchyard | Yes | Ancient 5m-7m | View On Map |
| Ickham | England | Kent | Canterbury | churchyard | Yes | Notable | View On Map |
| Icklesham | England | Sussex - East | Hastings | churchyard | Yes | Ancient 4m-5m | View On Map |
| Ickworth House | England | Suffolk | Bury St Edmunds | garden | Yes | Ancient 4m-5m | View On Map |
| Iffley | England | Oxfordshire | Oxford | churchyard | Yes | Ancient 7m+ | View On Map |
| Ifield | England | Sussex - West | Crawley | churchyard | Yes | Ancient 5m-7m | View On Map |
| Ifield – garden yew | England | Sussex - West | Crawley | garden | No | Ancient 5m-7m | No Map Data |
| Ightham Mote Farm – Kent | England | Kent | Sevenoaks | garden | Yes | Ancient 4m-5m | View On Map |
| Ilchester | England | Somerset | Yeovil | churchyard | Yes | Notable | View On Map |
| Illeville-sur- Montfort | France | Eure - Normandie | Rouen | churchyard | Yes | Ancient 4m-5m | View On Map |
| Ilston | Wales | Glamorgan | Swansea | churchyard | Yes | Ancient 5m-7m | View On Map |
| Inchbrakie – nr Crieff | Scotland | Perth and Kinross | Perth | historic site | No | Notable | View On Map |
| Inchlonaig | Scotland | Argyll and Bute | Luss | woodland | No | Notable | View On Map |
| Inkpen | England | Berkshire | Hungerford | churchyard | Yes | Notable | View On Map |
| Innesfallen Island | Ireland | Co. Kerry | Killarney | historic site | Yes | Notable | View On Map |
| Ipsden Heath – Checkendon | England | Oxfordshire | Wallingford | woodland | Yes | Notable | View On Map |
| Ipswich – Christchurch Park | England | Suffolk | Ipswich | parkland | Yes | Ancient 4m-5m | View On Map |
| Irby upon Humber | England | Lincolnshire | Grimsby | garden | No | Notable | View On Map |
| Irthing Gorge – Gilsland | England | Northumberland | Haltwhistle | cliff | Yes | Ancient 4m-5m | No Map Data |