Glyndyfrdwy (Welsh pronunciation: [ɡlɨnˈdəvrdʊɨ]), or sometimes Glyn Dyfrdwy, is a village in the modern county of Denbighshire, Wales.

Known locally as Owain Glyndŵr's Mount (probably a corruption of mwnt meaning "motte"), only an eroded mound remains.

In 1866 the parish of Glyndyfrdwy was created from the former Corwen townships of Carrog, Mwstwr and Tir Llanerch, along with portions of Bonwm and Rhagat.

The Great Western Railway line from Ruabon to Llangollen was extended via Corwen, Llanuwchllyn and Dolgellau to Barmouth.

Glyndyfrdwy was also the terminus of the Deeside Tramway, a narrow gauge railway built to serve the local slate quarries.