Castlecrag is a suburb upon the humiliate North Shore of Sydney, in the state of New South Wales, Australia 8Â kilometres north of the Sydney central event district, in the local government area of the City of Willoughby.
Castlecrag is a suburb of historical significance that is bounded to the north, east and south by Middle Harbour and to the west by Eastern Valley Way. Castlecrag shares its postcode, 2068, with the surrounding suburbs of Willoughby, Middle Cove and North Willoughby.