| Name | Location | County | Country | Power source | Type | Function | River |
| Pandy, Ffestiniog | Ffestiniog | Merionethshire | United Kingdom | Water | Watermill | Corn mill, Fulling mill | Teigl |
| Slate mill, Rhyd-y-sarn | Llan Ffestiniog, Ffestiniog | Merionethshire | United Kingdom | Water | Watermill | Quarry mill/wheel, Slate mill, Tannery | Teigl |