| Name | Location | County | Country | Power source | Type | Function | River |
| Felin Moelfre, Llanaelhaearn | Llanaelhaearn | Caernarfonshire | United Kingdom | Water | Watermill | Corn mill, Farm mill | Tributary to Erch |
| Gorse mill, Ysgubor-fawr, Llanaelhaearn | Llanaelhaearn | Caernarfonshire | United Kingdom | Water | Watermill | Farm mill, Gorse mill | |
| Melin Ynys Goch, Llanaelhaearn | Llanaelhaearn | Caernarfonshire | United Kingdom | Water | Watermill | Farm mill, Gorse mill | |
| Woollen factory, Llanaelhaearn | Llanaelhaearn | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill |