| Name | Location | County | Country | Power source | Type | Function | River |
| Llangwathan Mill, Hay-on-Wye | Hay-on-Wye | Brecknockshire | United Kingdom | Water | Watermill | Corn mill | Dulas Brook |
| Upper Mill, Hay-on-Wye | Hay-on-Wye | Brecknockshire | United Kingdom | Water | Watermill | Corn mill, Paper mill | Dulas Brook |
| Watermill, Hay-on-Wye | Hay-on-Wye | Brecknockshire | United Kingdom | Water | Watermill | Corn mill | Dulas Brook |
