| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Horndean | England | Hampshire | woodland | No | Ancient 5m-7m | View On Map | |
| Horndean area | England | Hampshire | Havant | garden | No | Ancient 4m-5m | View On Map |
| Horsmonden | England | Kent | Tunbridge Wells | churchyard | Yes | Ancient 4m-5m | View On Map |
| Horsted Keynes | England | Sussex - West | Haywards Heath | churchyard | Yes | Notable | View On Map |
| Horsted Keynes – garden | England | Sussex - West | Haywards Heath | garden | No | Ancient 5m-7m | View On Map |
| Horsted Keynes – Twyford Lane | England | Sussex - West | Haywards Heath | garden | No | Ancient 4m-5m | View On Map |
| Horton – Berkshire | England | Berkshire | Slough | churchyard | Yes | Lost, Notable | View On Map |
| Horton – Staffordshire | England | Staffordshire | Leek | churchyard | Yes | Ancient 5m-7m | View On Map |
| Horton Kirby | England | Kent | Dartford | churchyard | Yes | Ancient 5m-7m | View On Map |
| Houlbec-près-le- Gros- Theil | France | Eure - Normandie | Brionne | churchyard | Yes | Ancient 5m-7m | View On Map |
| Hound | England | Hampshire | Southampton | churchyard | Yes | Ancient 5m-7m | View On Map |
| Houppeville | France | Seine-Maritime - Normandie | Rouen | churchyard | Yes | Lost | View On Map |
| House of Dun – Montrose | Scotland | Angus | Montrose | garden | Yes | Notable | View On Map |
| Hovingham | England | Yorkshire - North | York | woodland | Yes | Notable | View On Map |
| Howell Wood | England | Yorkshire - South | Doncaster | woodland | Yes | Notable | View On Map |
| Huberville | France | Manche - Normandie | Valonges | churchyard | Yes | Notable | View On Map |
| Hughenden | England | Buckinghamshire | High Wycombe | churchyard | Yes | Notable | View On Map |
| Humbers Wood | England | Hampshire | Stockbridge | woodland | No | Ancient 5m-7m | View On Map |
| Hunsdon | England | Hertfordshire | Harlow | churchyard | Yes | Ancient 4m-5m | View On Map |
| Huntingdon Castle | Ireland | Carlow | Clonegal | planted avenue | No | Notable | View On Map |