The 2023 election to Newry, Mourne and Down District 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.
41 members were returned to the council via Single Transferable Vote.
|- | colspan="2" style="background-color:#f2f2f2;text-align:center;margin-bottom:-1px;border:1px solid #aaa;padding:.2em .4em" | Total | style="text-align:right;" | 41 | | | | | | style="text-align:right;" | 76,643 |<noinclude>
<small>Note: "Votes" are the first preference votes.</small>
The 2023 LG election in NMD saw the further decline of the SDLP and UUP, whereas Sinn Fein and Alliance made gains, with the DUP also gaining two councillors.
|- 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;">Sinn Féin</span> !colspan=2 bgcolor=""| <span style="color:black;">SDLP</span> !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="white"| <span style="black;">Independents and others</span> |- |align="left"|Crotlieve |bgcolor="#008800"|45.67 |bgcolor="#008800"|3 1 |17.74 |1 1 |4.57 |0 |5.03 |0 |3.42 |0 |23.57 |2 |6 |- |align="left"|Downpatrick |bgcolor="#008800"|43.45 |bgcolor="#008800"|2 1 |30.71 |2 1 |3.27 |0 |13.75 |1 1 |2.45 |0 |6.37 |0 1 |5 |- |align="left"|Newry |bgcolor="#008800"|65.15 |bgcolor="#008800"|4 1 |18.15 |2 |0.00 |0 |7.94 |0 |2.72 |0 |6.04 |0 1 |6 |- |align="left"|Rowallane |10.78 |0 |16.42 |1 |bgcolor="#D46A4C"|34.17 |bgcolor="#D46A4C"|2 |24.59 |2 1 |12.91 |0 1 |1.12 |0 |5 |- |align="left"|Slieve Croob |bgcolor="#008800"|47.56 |bgcolor="#008800"|3 1 |11.68 |0 1 |19.34 |1 1 |13.28 |1 |4.30 |0 1 |3.85 |0 |5 |- |align="left"|Slieve Gullion |bgcolor="#008800"|67.92 |bgcolor="#008800"|5 |16.00 |1 |2.45 |0 |2.03 |0 |8.15 |1 |3.46 |0 |7 |- |align="left"|The Mournes |bgcolor="#008800"|41.87 |bgcolor="#008800"|3 |12.91 |1 |25.65 |2 1 |8.27 |1 1 |3.82 |0 1 |7.47 |0 1 |7 |- class="unsortable" class="sortbottom" style="background:#C9C9C9" |align="left"| Total |48.32 |20 4 |17.18 |8 3 |11.90 |5 2 |9.36 |5 3 |5.30 |1 3 |7.93 |2 3 |41 |-
2019: 2 x Sinn Féin, 2 x SDLP, 2 x Independent
2023: 3 x Sinn Féin, 2 x Independent, 1 x SDLP
2019âÂÂ2023 Change: Sinn Féin gain from SDLP
2019: 3 x SDLP, 1 x Sinn Féin, 1 x Independent
2023: 2 x Sinn Féin, 2 x SDLP, 1 x Alliance
2019âÂÂ2023 Change: Sinn Féin and Alliance gain from SDLP and Independent
2019: 3 x Sinn Féin, 2 x SDLP, 1 x Independent
2023: 4 x Sinn Féin, 2 x SDLP
2019âÂÂ2023 Change: Sinn Féin gain from Independent
2019: 2 x DUP, 1 x UUP, 1 x Alliance, 1 x SDLP
2023: 2 x DUP, 2 x Alliance, 1 x SDLP
2019âÂÂ2023 Change: Alliance gain from UUP
2019: 2 x Sinn Féin, 1 x SDLP, 1 x UUP, 1 x Alliance
2023: 3 x Sinn Féin, 1 x DUP, 1 x Alliance
2019âÂÂ2023 Change: Sinn Féin and DUP gain from SDLP and UUP
2019: 5 x Sinn Féin, 1 x SDLP, 1 x UUP
2023: 5 x Sinn Féin, 1 x SDLP, 1 x UUP
2019âÂÂ2023 Change: No change
2019: 3 x Sinn Féin, 1 x SDLP, 1 x DUP, 1 x UUP, 1 x Independent
2023: 3 x Sinn Féin, 2 x DUP, 1 x SDLP, 1 x Alliance
2019âÂÂ2023 Change: DUP and Alliance gain from UUP and Independent