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Newcastle was one of the four district electoral areas in Down, Northern Ireland which existed from 1985 to 2014. The district elected six members to Down District Council, and formed part of the South Down constituencies for the Northern Ireland Assembly and UK Parliament.
It was created for the 1985 local elections, replacing Down Area C which had existed since 1973, and contained the wards of Castlewellan, Donard, Dundrum, Murlough, Shimna and Tollymore. It was abolished for the 2014 local elections, with Donard, Murlough, Shimna and Tollymore moving to The Mournes DEA and Castlewellan and Dundrum moving to the Slieve Croob DEA.