Elections to Castlereagh Borough Council were held on 5 May 2011 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 ! % !Cllrs !rowspan=2|TotalCllrs |- class="unsortable" align="center" !colspan=2 bgcolor="" | DUP !colspan=2 bgcolor="" | Alliance !colspan=2 bgcolor="" | UUP !colspan=2 bgcolor="" | SDLP !colspan=2 bgcolor="" | Green !colspan=2 bgcolor="white"| Others |- |align="left"|Castlereagh Central |bgcolor="#D46A4C"|41.4 |bgcolor="#D46A4C"|3 |28.8 |2 |12.9 |1 |5.7 |0 |0.0 |0 |11.2 |0 |6 |- |align="left"|Castlereagh East |bgcolor="#D46A4C"|56.0 |bgcolor="#D46A4C"|4 |26.3 |2 |5.6 |1 |0.0 |0 |7.7 |1 |4.4 |0 |7 |- |align="left"|Castlereagh South |bgcolor="#D46A4C"|36.5 |bgcolor="#D46A4C"|2 |19.6 |1 |12.0 |1 |22.6 |0 |0.0 |0 |9.3 |0 |5 |- |align="left"|Castlereagh West |bgcolor="#D46A4C"|32.7 |bgcolor="#D46A4C"|2 |27.0 |1 |16.1 |1 |17.3 |1 |0.0 |0 |6.9 |0 |5 |- class="unsortable" class="sortbottom" style="background:#C9C9C9" |align="left"| Total |42.6 |11 |25.2 |6 |11.2 |3 |11.0 |2 |2.9 |1 |7.1 |0 |23
Districts results
Castlereagh Central
2005: 4 x DUP, 1 x Alliance, 1 x UUP 2011: 3 x DUP, 2 x Alliance, 1 x UUP 2005-2011 Change: Alliance gain from DUP
Castlereagh East
2005: 5 x DUP, 1 x Alliance, 1 x UUP 2011: 4 x DUP, 2 x Alliance, 1 x Green 2005-2011 Change: Alliance and Green gain from DUP and UUP
Castlereagh South
2005: 2 x DUP, 1 x SDLP, 1 x Alliance, 1 x UUP 2011: 2 x DUP, 1 x SDLP, 1 x Alliance, 1 x UUP 2005-2011 Change: No change
Castlereagh West
2005: 2 x DUP, 1 x Alliance, 1 x SDLP, 1 x UUP 2011: 2 x DUP, 1 x Alliance, 1 x SDLP, 1 x UUP 2005-2011 Change: No change
References