Castle Connell (Irish: Caisleán Uí Chonaill) is a ruined castle on the banks of the River Shannon in the village of Castleconnell, approximately 11km (07miles) from the city of Limerick, Ireland.
The castle was built on a rock overlooking the River Shannon by the O'Connell's. It was the seat of the chief of Hy-Cuilean, a territory south-east of Abbeyfeale, in the barony of Upper Connello near the borders of Cork and Kerry. The castle then came into the possession of the O'Briens of Thomond.
The castle was blown up by General Godert de Ginkel during the War of the Two Kings. Its ruins are visible on the approach to the village on the road from Limerick.