| Name | Location | County | Country | Power source | Type | Function | River |
| Bontnewydd Mill, Bontnewydd | Bontnewydd | Caernarfonshire | United Kingdom | Water | Watermill | Corn mill | Gwyrfai |
| Woollen Factory, Bontnewydd | Bontnewydd | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | Gwyrfai |
| Woollen Factory, Rhyd-ddu | Rhyd-ddu, Betws Garmon | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | Gwyrfai |