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.
Election results
|-
| 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>
Note: "Votes" are the first preference votes.
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.
Districts summary
|- class="unsortable" align="centre" !rowspan=2 align="left"|District Electoral Area (DEA) ! % !Cllrs ! % !Cllrs ! % !Cllrs ! % !Cllrs ! % !Cllrs ! % !Cllrs !rowspan=2|Totalcllrs |- class="unsortable" align="center" !colspan=2 bgcolor="" | Sinn Féin !colspan=2 bgcolor=""| SDLP !colspan=2 bgcolor="" | DUP !colspan=2 bgcolor="" | Alliance !colspan=2 bgcolor="" | UUP !colspan=2 bgcolor="white"| Independents and others |- |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 |- |}