Killeen Castle is a 17th-century castle at Killeen, in Castlegar, County Galway, on the western coast of Ireland.
During the 19th century it was owned by the Blake Family along with an estate of over 100 acres (0.40 km2) with a gatehouse on the N17 and a large house on the hill up from the gatehouse. In the early 20th century it was purchased a farmer from Tuam who was managing the estate. The castle was then sold by his son in the 1980s to Alic Finn. He then sold the castle to a German man who had once stayed in the castle. Since then the castle has been extended and made into a family home. The castle was first built in the 17th century by the Normans and was placed beside an ancient church and a children's burial site. When purchased by Alec Finn it was renovated and stone from the church was used on the top of the castle.