Castletownshend (Irish: Baile an Chaisleáin) on Ireland's southwest coast, is a village about 8 km from Skibbereen, in County Cork, Republic of Ireland. The village developed around a small 17th century castle built by the Townshend family, who still reside there. As of 2004, the castle is open to the public as a bed and breakfast.

The main street of the town, lined with large homes from the 18th century, runs down a sharply sloped hill leading to Castlehaven Harbor and the castle. St. Barrahan's Church overlooks the town. It is noted for its stained glass windows, and for the classical music festival it has sponsored every year since 1980.

See also: List of towns in the Republic of Ireland