| Castlewarren | |
| Native Name: | Irish: Caisleán an Bhairínigh |
| Native Name Lang: | ga |
| Settlement Type: | Village |
| Pushpin Map: | Ireland |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Ireland |
| Subdivision Type: | Country |
| Subdivision Name: | Ireland |
| Subdivision Type1: | Province |
| Subdivision Name1: | Leinster |
| Subdivision Type3: | County |
| Subdivision Name3: | County Kilkenny |
| Unit Pref: | Metric |
| Population Density Km2: | auto |
| Utc Offset1: | +0 |
| Timezone1 Dst: | IST (WEST) |
| Utc Offset1 Dst: | -1 |
| Coordinates: | 52.6954°N -7.1083°W |
| Elevation M: | 200 |
| Blank Name: | Irish Grid Reference |
Castlewarren,[1] previously known as Buile (pronounced "Boula"), is a small village in County Kilkenny, Ireland, located some 4km (02miles) north of the N10 national primary road at Flagmount. The castle site, from which Castlewarren takes its name, is on top of a ridge 200m (700feet) above sea level.
The Catholic church in the village is dedicated to St.Scuithin. There was an old kiln where the church now stands; the people used to build a makeshift altar in the kiln where mass was celebrated. As time went on they began to build small shelters to protect the women of the congregation during inclement weather. The present church was built in 1829 in the shape of a cross.[2] Castlewarren is a sub-parish of Clara, County Kilkenny.