Rockstown Castle, Medieval tower house in Ballyneety, Ireland.

Rockstown Castle is a five-story stone tower built on a rocky outcrop in County Limerick. The structure features narrow defensive slits, square-headed windows, and a machicolation above the entrance, with most of its original stonework still standing today.

Rockstown Castle is a medieval tower house; the sources give no construction date. Its layout, with large main rooms and small rectangular chambers off the spiral stair, resembles tower houses of County Galway rather than the local Limerick type. The building is a ruin, with the first floor and roof gone, and it stands on private land behind Rockstown House.

Rockstown Castle is a ruined tower house on private land, with no public access, so its name and setting are what visitors can note from the area. The Irish name Caisleán Bhaile na Carraige links the tower to the townland of Rockstown, and the structure stands behind the ruins of Rockstown House.

The tower stands on a rocky outcrop behind the ruins of Rockstown House, near Ballyneety about 11 km from Limerick. The castle, house and surrounding land are privately owned and there is no public access, so the structure can only be viewed from outside.

A defensive trench was cut directly into the rock face before the entrance, creating an additional protective barrier. This feature shows how much effort went into protecting the structure from potential attackers.