The 2023 election to Lisburn and Castlereagh City Council was held on 18 May 2023, alongside other local elections in Northern Ireland, two weeks after local elections in England. The Northern Ireland elections were delayed by 2 weeks to avoid overlapping with the coronation of King Charles III.

Local elections were held in Northern Ireland on 18 May 2023. The elections were delayed by two weeks to avoid overlapping with the coronation of King Charles III. Following the elections, Sinn Féin became the largest party in local government for the first time. It also marked the first time that nationalist parties had garnered a greater share of the vote than unionist parties, however, despite this, there were more unionist councillors elected than nationalists.