Elections to Coleraine Borough Council were held on 30 May 1973 on the same day as the other Northern Irish local government elections. The election used three district electoral areas to elect a total of 20 councillors.
|- class="unsortable" align="centre" !rowspan=2 align="left"|Ward ! % <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;">Alliance</span> !colspan=2 bgcolor="" | <span style="color:black;">SDLP</span> !colspan=2 bgcolor="white"| <span style="black;">Others</span> |- |align="left"|Area A |bgcolor="40BFF5"|51.8 |bgcolor="40BFF5"|4 |4.7 |0 |15.9 |1 |27.6 |1 |6 |- |align="left"|Area B |bgcolor="40BFF5"|63.4 |bgcolor="40BFF5"|5 |21.3 |2 |5.3 |0 |10.0 |0 |7 |- |align="left"|Area C |bgcolor="40BFF5"|56.1 |bgcolor="40BFF5"|4 |13.1 |1 |0.0 |0 |30.8 |2 |7 |- |- class="unsortable" class="sortbottom" style="background:#C9C9C9" |align="left"| Total |57.2 |13 |13.2 |3 |6.8 |1 |22.8 |3 |20 |-
1973: 4 x UUP, 1 x SDLP, 1 x Independent Unionist
1973: 5 x UUP, 2 x Alliance
1973: 4 x UUP, 2 x Independent, 1 x Alliance