Caernarfonshire
Historic counties data provided by Association of British Counties / Historic Counties Trust.
| Name | Location | County | Country | Power source | Type | Function | River |
| Albert Roller Mill, Betws-y-Coed | Betws-y-Coed | Caernarfonshire | United Kingdom | Water | Roller flour mill, Watermill | Corn mill | |
| Beddgelert Mill, Beddgelert | Beddgelert | Caernarfonshire | United Kingdom | Water | Watermill | ||
| Bontnewydd Mill, Bontnewydd | Bontnewydd | Caernarfonshire | United Kingdom | Water | Watermill | Corn mill | Gwyrfai |
| Bryn y Felin, Beddgelert | Beddgelert | Caernarfonshire | United Kingdom | Water | Watermill | Crushing mill, Mine mill/wheel | Glaslyn |
| Brynkir Woollen Mills, Golan | Golan, Dolbenmaen | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | Henwy |
| City Steam Mills, Bangor | Bangor | Caernarfonshire | United Kingdom | Steam | Roller flour mill | Corn mill | |
| Factory Glaslyn, Porthmadog | Porthmadog, Dolbenmaen | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | Tributary to Glaslyn |
| Factory Pen-y-caerau, Aberdaron | Aberdaron | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | Tributary to Daron |
| Factory Uchaf, Penmachno | Penmachno, Bro Machno | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | Machno |
| Felin Isaf, Golan | Golan | Caernarfonshire | United Kingdom | Water | Watermill | Corn mill | Afon Cwm-ystradllyn |
| Felin Moelfre, Llanaelhaearn | Llanaelhaearn | Caernarfonshire | United Kingdom | Water | Watermill | Corn mill, Farm mill | Tributary to Erch |
| Felin Sarn, Clwt-y-bont | Clwt-y-bont, Llanddeiniolen | Caernarfonshire | United Kingdom | Water | Watermill | Slate mill | Marchlyn-bach |
| Fulling mill, Garndolbenmaen | Garndolbenmaen, Dolbenmaen | Caernarfonshire | United Kingdom | Water | Watermill | Fulling mill | |
| Fulling mill, Llanllyfni | Llanllyfni | Caernarfonshire | United Kingdom | Water | Watermill | Fulling mill | Llyfni |
| Gorse mill, Ysgubor-fawr, Llanaelhaearn | Llanaelhaearn | Caernarfonshire | United Kingdom | Water | Watermill | Farm mill, Gorse mill | |
| Gyffin Watermill, Conwy | Conwy | Caernarfonshire | United Kingdom | Water | Watermill | Corn mill | Afon Gyffin |
| Hafodlas Slate Quarry Mills, Betws-y-Coed | Betws-y-Coed | Caernarfonshire | United Kingdom | Water | Watermill | Quarry mill/wheel, Slate mill | Tributary to Llugwy |
| Hen Dwr Windmill, Eglwys-Rhos/Llanrhos | Eglwys-Rhos/Llanrhos, Llandudno | Caernarfonshire | United Kingdom | Wind | Tower mill | ||
| Melin Bodwrdda, Aberdaron | Aberdaron | Caernarfonshire | United Kingdom | Water | Watermill | Corn mill | Daron |
| Melin Maenan, Maenan | Maenan | Caernarfonshire | United Kingdom | Water | Watermill | Corn mill | Tributary to Conwy |
| Melin Ynys Goch, Llanaelhaearn | Llanaelhaearn | Caernarfonshire | United Kingdom | Water | Watermill | Farm mill, Gorse mill | |
| Minffordd Woollen Factory, Dolwyddelan | Dolwyddelan | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | Lledr |
| Nant Mill, Betws Garmon | Betws Garmon | Caernarfonshire | United Kingdom | Water | Watermill | ||
| Pandy Bodwrdda, Aberdaron | Aberdaron | Caernarfonshire | United Kingdom | Water | Watermill | Fulling mill | Daron |
| Pandy Clenenney, Golan | Golan, Dolbenmaen | Caernarfonshire | United Kingdom | Water | Watermill | Fulling mill | Henwy |
| Pandy Mill, Betws-y-coed | Betws-y-coed | Caernarfonshire | United Kingdom | Water | Watermill | ||
| Pandy, Nebo | Nebo, Llanllyfni | Caernarfonshire | United Kingdom | Water | Watermill | Fulling mill | Crychddwr |
| Pandy, Tregarth | Tregarth, Llandygai | Caernarfonshire | United Kingdom | Water | Watermill | Fulling mill | Tributary to Gegin |
| Pen-y-bont Factory, Garndolbenmaen | Garndolbenmaen, Dolbenmaen | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | |
| Penlan Mill, Llandygai | Llandygai | Caernarfonshire | United Kingdom | Water | Watermill | Flint mill | |
| Penmachno Mill, Penmachno | Penmachno, Bro Machno | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | Machno |
| Saethon Factory, Nanhoron Estate | Pwllheli, Buan | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | Horon |
| Saw mill, Chwilog | Chwilog, Llanystumdwy | Caernarfonshire | United Kingdom | Water | Watermill | Saw mill | Wen |
| Saw mill, Gelli Iago, Beddgelert | Beddgelert | Caernarfonshire | United Kingdom | Water | Watermill | Saw mill | Nantmor |
| Saw mill, Plas Gwynant, Beddgelert | Beddgelert | Caernarfonshire | United Kingdom | Water | Watermill | Saw mill | Llynedno |
| Slate mill (1), Bwlch Cwmllan Slate Quarry | Bwlch Cwmllan, Betws Garmon | Caernarfonshire | United Kingdom | Water | Watermill | Quarry mill/wheel, Slate mill | Tributary to Cwm Llan |
| Slate mill (2), Bwlch Cwmllan Slate Quarry | Bwlch Cwmllan, Betws Garmon | Caernarfonshire | United Kingdom | Water | Watermill | Quarry mill/wheel, Slate mill | Tributary to Cwm Llan |
| Slate mill, Dolgarth Slate Quarry | Dolbenmaen | Caernarfonshire | United Kingdom | Water | Watermill | Quarry mill/wheel, Slate mill | Ceunant Dolgerth |
| Tower mill, Foel Fawr, Pwllheli | Pwllheli, Llanbedrog | Caernarfonshire | United Kingdom | Wind | Tower mill | Corn mill | |
| Tower mill, Glanwydden | Llandudno | Caernarfonshire | United Kingdom | Wind | Tower mill | Corn mill | |
| Tower mill, Llanengan | Llanengan | Caernarfonshire | United Kingdom | Wind | Tower mill | Corn mill | |
| Tower mill, Nant-y-Gamar | Nant-y-Gamar | Caernarfonshire | United Kingdom | Wind | Tower mill | Corn mill | |
| Trefriw Mill, Trefriw | Trefriw | Caernarfonshire | United Kingdom | Water | Watermill | Textile mill | Afon Crafnant |
| Tryfan Factory, Groeslon | Groeslon, Llandwrog | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | Llifon |
| Upper Mill, Penmachno | Penmachno, Bro Machno | Caernarfonshire | United Kingdom | Water | Watermill | Corn mill | Machno |
| Victoria Flour Mills, Caernarfon | Caernarfon | Caernarfonshire | United Kingdom | Steam | Roller flour mill | Corn mill | |
| Watermill, Gyrn-goch, Clynnog | Gyrn-goch, Clynnog | Caernarfonshire | United Kingdom | Water | Watermill | Corn mill | Hen |
| Watermill, Llandudno Junction | Llandudno Junction, Conwy | Caernarfonshire | United Kingdom | Water | Watermill | Fulling mill, Woollen mill | Conwy |
| Watermill, Rhyd Ddu | Rhyd Ddu | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | Afon Gwyrfai |
| Watermill, Rhydybenllyg | Rhydybenllyg | Caernarfonshire | United Kingdom | Water | Watermill | ||
| Waterwheel, Cwm Ciprwth Mine | Cwm Ciprwth Mine | Caernarfonshire | United Kingdom | Water | Watermill | Mine mill/wheel | |
| Waterwheel, Hendre Quarry, Blaenau Ffestiniog | Hendre Quarry, Blaenau Ffestiniog | Caernarfonshire | United Kingdom | Water | Watermill | Quarry mill/wheel | |
| Waterwheel, Rhiwbach Quarry, Blaenau Ffestiniog | Rhiwbach Quarry, Blaenau Ffestiniog | Caernarfonshire | United Kingdom | Water | Watermill | Quarry mill/wheel | |
| Waterwheels, Blaen y Cwm Quarry, Blaenau Ffestiniog | Blaen y Cwm Quarry, Blaenau Ffestiniog | Caernarfonshire | United Kingdom | Water | Watermill | Quarry mill/wheel | |
| Waterwheels, Pen-y-bryn Quarry, Nantlle | Pen-y-bryn Quarry, Nantlle | Caernarfonshire | United Kingdom | Water | Watermill | Quarry mill/wheel | |
| Waterwheels, Pen-yr-orsedd Quarry, Nantlle | Pen-yr-orsedd Quarry, Nantlle | Caernarfonshire | United Kingdom | Water | Watermill | Quarry mill/wheel | |
| Wern-y-Pandy, Aber/Abergwyngregyn | Aber/Abergwyngregyn | Caernarfonshire | United Kingdom | Water | Watermill | Fulling mill | Anafon |
| Windmill, Llanbedrog | Llanbedrog | Caernarfonshire | United Kingdom | Wind | Tower mill | ||
| Woollen Factories, Dolgarrog | Dolgarrog | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | Ddu |
| Woollen Factory, Bontnewydd | Bontnewydd | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | Gwyrfai |
| Woollen Factory, Fachwen | Fachwen, Llanddeiniolen | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | Fachwen |
| Woollen factory, Llanaelhaearn | Llanaelhaearn | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | |
| Woollen Factory, Rhyd-ddu | Rhyd-ddu, Betws Garmon | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | Gwyrfai |
| Woollen Factory, Tai'n-Lon | Tai'n-Lon, Clynnog | Caernarfonshire | United Kingdom | Water | Watermill | Woollen mill | Desach |
| Ynys-y-pandy Slate Mill, Cwmystradllyn | Cwmystradllyn | Caernarfonshire | United Kingdom | Water | Watermill | Slate mill | Afon Cwmystradllyn |