Penygroes is a village in Gwynedd, Wales. The village is located to the south of Caernarfon, and north of Porthmadog, by the A487 road. Penygroes' population stands at 1,793 at the 2011 census, of which 88% are Welsh-speaking, making it one of the most predominantly Welsh-speaking areas of the country. The population of Llanllyfni community, which includes Penygroes and Llanllyfni village, which practically adjoins Penygroes, plus Talysarn, is 4,135 according to the 2011 census.

Gwynedd is a county in the north-west of Wales. It borders Anglesey across the Menai Strait to the north, Conwy, Denbighshire, and Powys to the east, Ceredigion over the Dyfi estuary to the south, and the Irish Sea to the west. The city of Bangor is the largest settlement, and the administrative centre is Caernarfon. The preserved county of Gwynedd, which is used for ceremonial purposes, includes the Isle of Anglesey.