Elections to Coleraine Borough Council were held on 17 May 1989 on the same day as the other Northern Irish local government elections.

The election used three district electoral areas to elect a total of 21 councillors.

Note: "Votes" are the first preference votes.

1985: 4 x UUP, 2 x SDLP, 1 x DUP 1989: 4 x UUP, 2 x SDLP, 1 x DUP 1985-1989 Change: No change 1985: 3 x DUP, 2 x UUP, 1 x Alliance, 1 x Independent 1989: 3 x UUP, 2 x DUP, 1 x Alliance, 1 x Independent 1985-1989 Change: UUP gain from DUP 1985: 4 x UUP, 2 x DUP, 1 x Alliance 1989: 3 x UUP, 2 x DUP, 1 x Alliance, 1 x Independent Unionist 1985-1989 Change: Independent Unionist leaves UUP