Elections to Castlereagh Borough Council were held on 15 May 1985 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
|- class="unsortable" align="centre" !rowspan=2 align="left"|Ward ! % !Cllrs ! % !Cllrs ! % !Cllrs ! % !Cllrs !rowspan=2|TotalCllrs |- class="unsortable" align="center" !colspan=2 bgcolor="" | DUP !colspan=2 bgcolor="" | UUP !colspan=2 bgcolor="" | Alliance !colspan=2 bgcolor="white"| Others |- |align="left"|Castlereagh Central |bgcolor="#D46A4C"|58.2 |bgcolor="#D46A4C"|4 |19.6 |2 |20.5 |1 |1.7 |0 |7 |- |align="left"|Castlereagh East |bgcolor="#D46A4C"|46.2 |bgcolor="#D46A4C"|3 |31.9 |3 |18.1 |1 |3.8 |0 |7 |- |align="left"|Castlereagh South |bgcolor="#D46A4C"|40.1 |bgcolor="#D46A4C"|3 |35.5 |3 |17.7 |1 |6.7 |0 |7 |- class="unsortable" class="sortbottom" style="background:#C9C9C9" |align="left"| Total |48.0 |10 |29.0 |8 |18.8 |3 |4.2 |0 |21
District results
Castlereagh Central
1985: 4 x DUP, 2 x UUP, 1 x Alliance
Castlereagh East
1985: 3 x DUP, 3 x UUP, 1 x Alliance
Castlereagh South
1985: 3 x DUP, 3 x UUP, 1 x Alliance
References