Cefn Meiriadog is a rural community in Denbighshire, Wales, just south-west of the city of St Asaph. The boundary of the community on three sides is the river Elwy, which here forms the county boundary with Conwy County Borough. Arguably the largest settlement in the community is the hamlet of Bontnewydd. Also in the community are the hamlets of Groesffordd Marli where Ysgol Cefn Meiriadog is situated, and Cefn.