1989 Castlereagh Borough Council election

Elections to Castlereagh Borough Council were held on 17 May 1989 on the same day as the other Northern Irish local government elections. The election used three district electoral areas to elect a total of 21 councillors.

Election results
Note: "Votes" are the first preference votes.

Districts summary
!rowspan=2 align="left"|Ward ! %
 * - class="unsortable" align="centre"

!Cllrs

! %

!Cllrs

! %

!Cllrs

! %

!Cllrs

! %

!Cllrs

!rowspan=2|Total Cllrs

!colspan=2 bgcolor="" | DUP !colspan=2 bgcolor="" | UUP !colspan=2 bgcolor="" | Alliance !colspan=2 bgcolor="" | UPUP !colspan=2 bgcolor="white"| Others
 * - class="unsortable" align="center"
 * align="left"|Castlereagh Central
 * bgcolor="#D46A4C"|60.1
 * bgcolor="#D46A4C"|4
 * 20.0
 * 2
 * 19.9
 * 1
 * 0.0
 * 0
 * 0.0
 * 0
 * 7
 * align="left"|Castlereagh East
 * bgcolor="#D46A4C"|43.7
 * bgcolor="#D46A4C"|3
 * 14.7
 * 1
 * 18.1
 * 1
 * 9.2
 * 1
 * 14.3
 * 1
 * 7
 * align="left"|Castlereagh South
 * 32.8
 * 2
 * bgcolor="40BFF5"|42.0
 * bgcolor="40BFF5"|3
 * 25.2
 * 2
 * 0.0
 * 0
 * 0.0
 * 0
 * 7
 * - class="unsortable" class="sortbottom" style="background:#C9C9C9"
 * align="left"| Total
 * 45.0
 * 9
 * 27.0
 * 6
 * 21.5
 * 4
 * 2.5
 * 1
 * 4.0
 * 1
 * 21
 * }
 * 1
 * 21
 * }
 * }

Castlereagh Central
1985: 4 x DUP, 2 x UUP, 1 x Alliance

1989: 4 x DUP, 2 x UUP, 1 x Alliance

1985-1989 Change: No change

Castlereagh East
1985: 3 x DUP, 3 x UUP, 1 x Alliance

1989: 3 x DUP, 1 x Alliance, 1 x UUP, 1 x UPUP, 1 x Independent Unionist

1985-1989 Change: UPUP and Independent Unionist gain from UUP (two seats)

Castlereagh South
1985: 3 x DUP, 3 x UUP, 1 x Alliance

1989: 3 x UUP, 2 x DUP, 2 x Alliance

1985-1989 Change: Alliance gain from DUP