Elections to Newry and Mourne District Council were held on 17 May 1989 on the same day as the other Northern Irish local government elections.

The election used five district electoral areas to elect a total of 30 councillors.

Note: "Votes" are the first preference votes.

1985: 4 x SDLP, 2 x UUP, 1 x Independent Nationalist 1989: 5 x SDLP, 1 x UUP, 1 x Independent Nationalist 1985-1989 Change: SDLP gain from UUP 1985: 4 x SDLP, 1 x Sinn Féin, 1 x UUP, 1 x IIP 1989: 4 x SDLP, 1 x Sinn Féin, 1 x UUP, 1 x Independent Nationalist 1985-1989 Change: Independent Nationalist leaves IIP 1985: 3 x SDLP, 2 x Sinn Féin 1989: 3 x SDLP, 2 x Sinn Féin 1985-1989 Change: No change 1985: 3 x SDLP, 2 x UUP, 1 x Sinn Féin 1989: 2 x SDLP, 2 x UUP, 1 x Sinn Féin, 1 x DUP 1985-1989 Change: SDLP gain from DUP 1985: 2 x UUP, 1 x SDLP, 1 x DUP, 1 x Sinn Féin 1989: 2 x UUP, 2 x SDLP, 1 x Protestant Unionist 1985-1989 Change: SDLP gain from Sinn Féin, Protestant Unionist leaves DUP