Gwyddelwern is a small village and community of 508 residents, reducing to 500 at the 2011 census, situated approximately 2 miles (3.2 km) north of Corwen in Denbighshire in Wales. Historically the village was part of the Edeyrnion district of Meirionnydd. Edeyrnion was part of the Glyndŵr district of Clwyd from 1974 to 1996, when the area became part of the principal area of Denbighshire. The village straddles the A494 road.

Denbighshire is a county in the north-east of Wales. It borders the Irish Sea to the north, Flintshire to the east, Wrexham to the southeast, Powys to the south, and Gwynedd and Conwy to the west. Rhyl is the largest town, and Ruthin is the administrative centre. Its borders differ from the historic county of the same name.