Elections to Antrim Borough Council were held on 5 May 2005 on the same day as the other Northern Irish local government elections. The election used three district electoral areas to elect a total of 19 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 /> ! %<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;">SDLP</span> !colspan=2 bgcolor="" | <span style="color:black;">Sinn Féin</span> !colspan=2 bgcolor="" | <span style="color:black;">Alliance</span> !colspan=2 bgcolor="white"| <span style="black;">Others</span> |- |align="left"|Antrim North West |24.9 |1 |14.1 |1 |27.4 |1 |bgcolor="#008800"|28.7 |bgcolor="#008800"|2 |0.0 |0 |4.9 |0 |5 |- |align="left"|Antrim South East |bgcolor="#D46A4C"|34.6 |bgcolor="#D46A4C"|2 |27.4 |2 |20.0 |1 |9.0 |1 |8.3 |1 |0.7 |0 |7 |- |align="left"|Antrim Town |bgcolor="#D46A4C"|31.2 |bgcolor="#D46A4C"|3 |28.4 |2 |14.6 |1 |9.0 |0 |11.7 |1 |5.1 |0 |7 |- |- class="unsortable" class="sortbottom" style="background:#C9C9C9" |align="left"| Total |30.7 |6 |23.8 |5 |20.5 |3 |14.8 |3 |6.9 |2 |3.3 |0 |19 |-
2001: 2 x SDLP, 1 x Sinn Féin, 1 x DUP, 1 x UUP<br /> 2005: 2 x Sinn Féin, 1 x SDLP, 1 x DUP, 1 x UUP<br /> 2001-2005 Change: Sinn Féin gain from SDLP
2001: 3 x UUP, 2 x DUP, 1 x SDLP, 1 x Sinn Féin<br /> 2005: 2 x DUP, 2 x UUP, 1 x SDLP, 1 x Sinn Féin, 1 x Alliance<br /> 2001-2005 Change: Alliance gain from UUP
2001: 3 x UUP, 2 x DUP, 2 x SDLP<br /> 2005: 3 x DUP, 2 x UUP, 1 x SDLP, 1 x Alliance<br /> 2001-2005 Change: DUP and Alliance gain from UUP and SDLP