Elections to Larne Borough Council were held on 15 May 1985 on the same day as the other Northern Irish local government elections. The election used three district electoral areas to elect a total of 15 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 /> !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="white"| <span style="black;">Others</span> |- |align="left"|Coast Road |bgcolor="D46A4C"|36.7 |bgcolor="D46A4C"|2 |28.9 |1 |12.9 |1 |21.5 |1 |5 |- |align="left"|Larne Lough |40.4 |2 |bgcolor="40BFF5"|50.0 |bgcolor="40BFF5"|3 |9.6 |0 |0.0 |0 |5 |- |align="left"|Larne Town |bgcolor="D46A4C"|41.1 |bgcolor="D46A4C"|2 |32.6 |2 |26.3 |1 |0.0 |0 |5 |- |- class="unsortable" class="sortbottom" style="background:#C9C9C9" |align="left"| Total |39.4 |6 |37.3 |6 |16.4 |2 |6.9 |1 |15 |-
1985: 2 x DUP, 1 x UUP, 1 x Alliance, 1 x Independent Nationalist
1985: 3 x UUP, 2 x DUP
1985: 2 x UUP, 2 x DUP, 1 x Alliance