Grey Abbey (Irish: An Mhainistir Liath)[1] is a ruined Cistercian priory in Greyabbey, County Down, Northern Ireland.

Currently maintained by the Northern Ireland Environment Agency, it is a monument in state care in the townland of Rosemount, on the eastern edge of the village of Greyabbey in the Ards and North Down local government district.

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Grey Abbey was founded in 1193[4] by John de Courcy's wife, Affreca.

[5]54°32′09″N 5°33′30″W / 54.5358°N 5.5583°W / 54.5358; -5.5583