2023 Lisburn and Castlereagh City Council election

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.

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.

Election results

 * colspan="2" style="background-color:#f2f2f2;text-align:center;margin-bottom:-1px;border:1px solid #aaa;padding:.2em .4em" | 
 * style="text-align:right;" | 40
 * style="text-align:right;" | 56,404
 * style="text-align:right;" | 56,404
 * style="text-align:right;" | 56,404
 * style="text-align:right;" | 56,404
 * style="text-align:right;" | 56,404
 * style="text-align:right;" | 56,404
 * style="text-align:right;" | 56,404

Note: "Votes" are the first preference votes.

Districts summary
!rowspan=2 align="left"|District Electoral Area (DEA) ! %
 * - class="unsortable" align="centre"

!Cllrs

! %

!Cllrs

! %

!Cllrs

! %

!Cllrs

! %

!Cllrs

! %

!Cllrs

!rowspan=2|Total cllrs

!colspan=2 bgcolor="" | DUP !colspan=2 bgcolor="" | Alliance !colspan=2 bgcolor="" | UUP !colspan=2 bgcolor="" | Sinn Féin !colspan=2 bgcolor=""| SDLP !colspan=2 bgcolor="white"| Independents and others
 * - class="unsortable" align="center"
 * align="left"|Castlereagh East
 * bgcolor="#D46A4C"|50.92
 * bgcolor="#D46A4C"|3
 * 30.78
 * 2
 * 9.03
 * 1
 * 0.00
 * 0
 * 0.00
 * 0
 * 9.28
 * 0
 * 6
 * align="left"|Castlereagh South
 * 15.05
 * 1
 * bgcolor="#F6CB2F"|32.36
 * bgcolor="#F6CB2F"|3 1
 * 7.46
 * 0 1
 * 21.61
 * 2 1
 * 17.05
 * 1
 * 6.92
 * 0 1
 * 7
 * align="left"|Downshire East
 * bgcolor="#D46A4C"|41.34
 * bgcolor="#D46A4C"|2
 * 30.06
 * 2 1
 * 17.47
 * 1 1
 * 0.00
 * 0
 * 4.51
 * 0
 * 5.73
 * 0
 * 5
 * align="left"|Downshire West
 * bgcolor="#D46A4C"|40.19
 * bgcolor="#D46A4C"|2
 * 36.62
 * 2 1
 * 17.26
 * 1 1
 * 4.21
 * 0
 * 0.00
 * 0
 * 1.73
 * 0
 * 5
 * align="left"|Killultagh
 * bgcolor="#D46A4C"|33.49
 * bgcolor="#D46A4C"|2
 * 22.22
 * 1
 * 15.66
 * 1
 * 23.36
 * 1
 * 4.34
 * 0
 * 0.93
 * 0
 * 5
 * align="left"|Lisburn North
 * bgcolor="#D46A4C"|26.47
 * bgcolor="#D46A4C"|1 1
 * 23.61
 * 1
 * 13.65
 * 1 1
 * 14.67
 * 1 1
 * 11.07
 * 1
 * 10.54
 * 1 1
 * 6
 * align="left"|Lisburn South
 * bgcolor="#D46A4C"|38.20
 * bgcolor="#D46A4C"|3
 * 23.81
 * 2 1
 * 19.95
 * 1 1
 * 6.58
 * 0
 * 6.30
 * 0
 * 5.16
 * 0
 * 6
 * - class="unsortable" class="sortbottom" style="background:#C9C9C9"
 * align="left"| Total
 * 34.02
 * 14 1
 * 28.48
 * 13 4
 * 13.97
 * 6 5
 * 10.98
 * 4 2
 * 6.69
 * 2
 * 5.87
 * 1
 * 40
 * }
 * 4 2
 * 6.69
 * 2
 * 5.87
 * 1
 * 40
 * }
 * }

Castlereagh East
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

Castlereagh South
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

Downshire East
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

Downshire West
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

Killultagh
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

Lisburn North
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

Lisburn South
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