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.
<small>Note: "Votes" are the first preference votes.</small>
|- class="unsortable" align="centre" !rowspan=2 align="left"|Ward ! % <br /> !Cllrs<br /> ! % <br /> !Cllrs<br /> ! %<br /> !Cllrs<br /> ! %<br /> !Cllrs<br /> ! % <br /> !Cllrs<br /> !rowspan=2|Total<br />Cllrs<br /> |- class="unsortable" align="center" !colspan=2 bgcolor="" | <span style="color:black;">DUP</span> !colspan=2 bgcolor="" | <span style="color:black;">UUP</span> !colspan=2 bgcolor="" | <span style="color:black;">Alliance</span> !colspan=2 bgcolor="" | <span style="color:black;">UPUP</span> !colspan=2 bgcolor="white"| <span style="black;">Others</span> |- |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 |-
1993: 3 x DUP, 1 x Alliance, 1 x UUP, 1 x Independent Unionist
1993: 3 x DUP, 1 x Alliance, 1 x UUP, 1 x UPUP, 1 x Independent Unionist
1993: 2 x Alliance, 2 x UUP, 1 x DUP
1993: 2 x UUP, 2 x DUP, 1 x Alliance