Castlebaldwin or Bellanagarrigeeny (Irish: Béal Átha na gCarraigíní, meaning "mouth of the ford of the small rocks") is a townland and a very small village in County Sligo, Ireland.
The castle outside the village of Castlebaldwin is a fortified 17th-century house (Duchas reference SL034-185--- Grid reference G:75686:14470) rather than a medieval castle, with gun slits in the walls and a machicolation over the door. The walls of the castle are made from stones taken from a nunnery that was near the village. To hold the stones together blood from animals was mixed to sand to form mortar to help the stones stick. Castlebaldwin is situated near the Carrowkeel Passage Tombs which are some of the oldest tombs in Europe.