Mooncoin () (pop. 1,000) is a census town in County Kilkenny, in Ireland. The population had increased to 1,166 at the 2011 census. Historically part of the Gaelic kingdom of Osraige, today it is in the far south of the county of Kilkenny, located in the valley of the River Suir. It is surrounded by the uplands of the Slievenamon and Comeragh Mountains, just north of Waterford City along the N24 national primary road (Waterford to Limerick), and it is south of Kilkenny.