Elections to Ballymena Borough Council were held on 30 May 1973 on the same day as the other Northern Irish local government elections. The election used four district electoral areas to elect a total of 21 councillors.
|- 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;">UUP</span> !colspan=2 bgcolor="" | <span style="color:black;">DUP</span> !colspan=2 bgcolor="" | <span style="color:black;">Alliance</span> !colspan=2 bgcolor="" | <span style="color:black;">Vanguard</span> !colspan=2 bgcolor="white"| <span style="black;">Others</span> |- |align="left"|Area A |bgcolor="40BFF5"|45.3 |bgcolor="40BFF5"|2 |13.6 |1 |2.3 |0 |0.0 |0 |38.8 |1 |4 |- |align="left"|Area B |16.0 |1 |39.1 |2 |5.3 |0 |0.0 |0 |bgcolor="DDDDDD"|39.6 |bgcolor="DDDDDD"|3 |6 |- |align="left"|Area C |bgcolor="40BFF5"|40.9 |bgcolor="40BFF5"|3 |18.4 |1 |4.5 |0 |22.4 |1 |13.8 |0 |5 |- |align="left"|Area D |bgcolor="40BFF5"|50.8 |bgcolor="40BFF5"|3 |22.8 |1 |11.7 |1 |0.0 |0 |14.7 |1 |6 |- |- class="unsortable" class="sortbottom" style="background:#C9C9C9" |align="left"| Total |37.9 |9 |24.2 |5 |6.4 |1 |5.6 |1 |25.9 |5 |21 |-
1973: 2 x UUP, 1 x DUP, 1 x Independent Unionist
1973: 2 x UUP, 2 x Independent Unionist, 1 x DUP, 1 x Independent
1973: 3 x UUP, 1 x DUP, 1 x Vanguard
1973: 3 x UUP, 1 x DUP, 1 x Alliance, 1 x Independent