Ardudwy (Welsh pronunciation: [arˈdɨ̞duːɨ̯]) is an area of Gwynedd in north-west Wales, lying between Tremadog Bay and the Rhinogydd. Administratively, under the old Kingdom of Gwynedd, it was first a division of the sub kingdom (cantref) of Dunoding and later a commote in its own right. The fertile swathe of land stretching from Barmouth to Harlech was historically used as pasture. The name exists in the modern community and village of Dyffryn Ardudwy.