Penmachno is a village in the isolated upland valley of Cwm Penmachno, 4 miles south of Betws-y-Coed in the county of Conwy, north Wales. The two parts of the village are linked by a five-arched, stone bridge dating from 1785. The village has been referred to as Pennant Machno, Llandudclyd and Llan dutchyd in historical sources.