Castle Warren lies in a field, east of the town of Carrigaline, in County Cork in Ireland.
The first building on this site was an Anglo-Norman castle; Barnahely Castle. During the 15th-16th century a new castle was built here. That castle was occupied by the archdeacons of Monkstown.
In 1796 Barnahely Castle was bought by the Warren family. They built a mansion, incorporating the remains of the earlier castle, and called it Castle Warren. It are the remains of that mansion that we see today.
in 1851 Robert Warren sold Castle Warren and the surrounding lands and moved to Co. Sligo. I was not able to find more historical information about this site. If you know more, please mail me.
The remains of Castle Warren are that of a rectangular bawn. At present it seemed to be used as a cattle shed. I could not venture around more at this site because the soil was very waterlogged which made the mud ankle-deep.