Lisburn and Castlereagh is a local government district in Northern Ireland. The district was created on 1 April 2015. It consists of the combined area of the City of Lisburn with the Borough of Castlereagh, but not including "the localities of Gilnahirk, Tullycarnet, Braniel, Castlereagh, Merok, Cregagh, Wynchurch, Glencregagh and Belvoir, Collin Glen, Poleglass, Lagmore, Twinbrook, Kilwee and Dunmurry" which transferred to Belfast. The local authority is Lisburn and Castlereagh City Council.