Castlemartyr (formerly anglicised as Ballymarter or Ballymartyr) is a village in east County Cork, Ireland. It is located 25 minutes east of Cork city, 10 km (6 mi) east of Midleton, 16 km (10 mi) west of Youghal and 6 km (4 mi) from the coast. About 500 people live in the village with a further 2,000 in its immediate hinterland.
It is situated on the busy N25 national primary road and has an expanding network of community and sporting organisations. Castlemartyr is a historical village with a range of sites of archaeological and socio-cultural interest, reflecting virtually every era in the country's history and pre-history.