Lisburn City Council was the local authority for an area partly in County Antrim and partly in County Down in Northern Ireland. As of May 2015 it was merged with Castlereagh Borough Council as part of the reform of local government in Northern Ireland to become Lisburn and Castlereagh City Council. Created in 1974, the council was the second largest in the Belfast Metropolitan Area. Council headquarters were in the city of Lisburn.