County Kilkenny (Irish: Contae Chill Chainnigh) is a county in Ireland. It is part of the South-East Region and is also located in the province of Leinster.
It is named after the city of Kilkenny. The territory of the county was the core part of the ancient Irish Kingdom of Osraige which in turn was the core of the Diocese of Ossory. Kilkenny County Council is the local authority for the county. According to the 2011 census the population of the county is 95,419.
Kilkenny is the 16th largest of Ireland's 32 counties in area and the 21st largest in terms of population.
It is the third largest of Leinster's 12 counties in size and seventh largest in terms of population.