Cwm-y-glo is a small village in Wales, 4+1⁄2 miles (7 km) east of Caernarfon, between Llanberis and Llanrug. It is in the Arfon Parliamentary constituency, the community of Llanrug, and the Gwynedd Council electoral ward. Cwm-y-glo ward includes Ceunant and Pont-rug and has a population of around 1,000.