Elections to Castlereagh Borough Council were held on 19 May 1993 on the same day as the other Northern Irish local government elections. The election used four district electoral areas to elect a total of 23 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 ! % !Cllrs !rowspan=2|TotalCllrs |- class="unsortable" align="center" !colspan=2 bgcolor="" | DUP !colspan=2 bgcolor="" | UUP !colspan=2 bgcolor="" | Alliance !colspan=2 bgcolor="" | UPUP !colspan=2 bgcolor="white"| Others |- |align="left"|Castlereagh Central |bgcolor="#D46A4C"|57.4 |bgcolor="#D46A4C"|3 |15.1 |1 |18.6 |1 |0.0 |0 |8.9 |1 |6 |- |align="left"|Castlereagh East |bgcolor="#D46A4C"|52.0 |bgcolor="#D46A4C"|3 |8.9 |1 |15.3 |1 |9.3 |1 |14.5 |1 |7 |- |align="left"|Castlereagh South |30.5 |1 |31.0 |2 |bgcolor="#F6CB2F"|31.1 |bgcolor="#F6CB2F"|2 |0.0 |0 |7.4 |0 |5 |- |align="left"|Castlereagh West |31.8 |2 |bgcolor="40BFF5"|37.9 |bgcolor="40BFF5"|2 |25.6 |1 |0.0 |0 |4.7 |0 |5 |- class="unsortable" class="sortbottom" style="background:#C9C9C9" |align="left"| Total |44.1 |9 |21.9 |6 |21.9 |5 |2.8 |1 |9.3 |2 |23 |- |}