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.

[1] The Northern Ireland elections were delayed by 2 weeks to avoid overlapping with the coronation of King Charles III.

[2] The election returned 40 members to the council via Single Transferable Vote.

This consisted of 14 Democratic Unionist Party members (who topped the polls in three districts: Castlereagh East, Downshire East and Lisburn South), 13 Alliance Party members (who topped the polls in two districts: Castlereagh South and Downshire West), 6 Ulster Unionist Party members, 4 Sinn Féin members (who topped the polls in two districts: Killultagh and Lisburn North), 2 Social Democratic and Labour Party members and 1 Independent member.

2019: 3 x DUP, 2 x Alliance, 1 x UUP 2023: 3 x DUP, 2 x Alliance, 1 x UUP 2019–2023 Change: No change 2019: 2 x Alliance, 1 x DUP, 1 x SDLP, 1 x Sinn Féin, 1 x UUP, 1 x Green 2023: 3 x Alliance, 2 x Sinn Féin, 1 x DUP, 1 x SDLP 2019–2023 Change: Alliance and Sinn Féin gain from Green and UUP 2019: 2 x DUP, 2 x UUP, 1 x Alliance 2023: 2 x DUP, 2 x Alliance, 1 x UUP 2019–2023 Change: Alliance gain from UUP 2019: 2 x DUP, 2 x UUP, 1 x Alliance 2023: 2 x DUP, 2 x Alliance, 1 x UUP 2019–2023 Change: Alliance gain from UUP 2019: 2 x DUP, 1 x Alliance, 1 x UUP, 1 x Sinn Féin 2023: 2 x DUP, 1 x Sinn Féin, 1 x Alliance, 1 x UUP 2019–2023 Change: No change 2019: 2 x DUP, 2 x UUP, 1 x Alliance, 1 x SDLP 2023: 1 x DUP, 1 x Alliance, 1 x Sinn Féin, 1 x UUP, 1 x SDLP, 1 x Independent 2019–2023 Change: Sinn Féin and Independent gain from DUP and UUP 2019: 3 x DUP, 2 x UUP, 1 x Alliance 2023: 3 x DUP, 2 x Alliance, 1 x UUP 2019–2023 Change: Alliance gain from UUP