Lisburn and Castlereagh is a local government district in Northern Ireland.

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 district takes in many of the outer suburbs of Belfast and had an electorate of 83,369 prior to its formation.

The first election for the new district council was originally due to take place in May 2009, but on 25 April 2008, Shaun Woodward, Secretary of State for Northern Ireland announced that the scheduled 2009 district council elections were to be postponed until 2011.

[6] For the purpose of elections the council is divided into seven district electoral areas (DEA):[7]