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.
|- | colspan="2" style="background-color:#f2f2f2;text-align:center;margin-bottom:-1px;border:1px solid #aaa;padding:.2em .4em" | Total | style="text-align:right;" | 40 | | | | | | style="text-align:right;" | 56,404 |<noinclude>
<small>Note: "Votes" are the first preference votes.</small>
|- class="unsortable" align="centre" !rowspan=2 align="left"|District Electoral Area (DEA) ! % <br /> !Cllrs<br /> ! %<br /> !Cllrs<br /> ! %<br /> !Cllrs<br /> ! %<br /> !Cllrs<br /> ! %<br /> !Cllrs<br /> ! %<br /> !Cllrs<br /> !rowspan=2|Total<br />cllrs<br /> |- class="unsortable" align="center" !colspan=2 bgcolor="" | <span style="color:black;">DUP</span> !colspan=2 bgcolor="" | <span style="color:black;">Alliance</span> !colspan=2 bgcolor="" | <span style="color:black;">UUP</span> !colspan=2 bgcolor="" | <span style="color:black;">Sinn Féin</span> !colspan=2 bgcolor=""| <span style="color:black;">SDLP</span> !colspan=2 bgcolor="white"| <span style="black;">Independents and others</span> |- |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 |-
2019: 3 x DUP, 2 x Alliance, 1 x UUP
2023: 3 x DUP, 2 x Alliance, 1 x UUP
2019âÂÂ2023 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
2019âÂÂ2023 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
2019âÂÂ2023 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
2019âÂÂ2023 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
2019âÂÂ2023 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
2019âÂÂ2023 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
2019âÂÂ2023 Change: Alliance gain from UUP