| Name | Location | County | Country | Power source | Type | Function | River |
| Fulling mill, Llanllyfni | Llanllyfni | Caernarfonshire | United Kingdom | Water | Watermill | Fulling mill | Llyfni |
| Saw mill, Blaen Llynfi, Cathedine | Cathedine, Llanfihangel Cwmdu with Bwlch and Cathedine | Brecknockshire | United Kingdom | Water | Watermill | Saw mill | Llyfni |