Inverallochy Castle is a ruined castle near the village of Inverallochy in the Buchan area of north-east Scotland.
The ruins lie a half-mile south of Cairnbulg Castle near Fraserburgh. Walls surrounding an inner courtyard remain, along with one partly collapsed tower. Evidence of a larger outer courtyard measuring approximately 60 meters square to the north and east remains.
The original castle dates to the 13th century built by the Comyn family. It was one of The Nine Castles of Knuckle may be associated with the Abbey of Deer in Mintlaw.