Elections to Belfast City Council were held on 20 May 1981 on the same day as the other Northern Irish local government elections. The election used nine district electoral areas to elect a total of 51 councillors, most representing the more heavily populated north and west.
The DUP became the largest party, overtaking the UUP, while Grace Bannister from the UUP became the first female Lord Mayor.
<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 /> ! %<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=""| <span style="color:black;">SDLP</span> !colspan=2 bgcolor="" | <span style="color:black;">PD</span> !colspan=2 bgcolor="" | <span style="color:black;">IRSP</span> !colspan=2 bgcolor="" | <span style="color:black;">UDP</span> !colspan=2 bgcolor="" | <span style="color:black;">UPNI</span> !colspan=2 bgcolor="" | <span style="color:black;">PUP</span> !colspan=2 bgcolor="white"| <span style="black;">Others</span> |- |align="left"|Area A |bgcolor="#D46A4C"|39.3 |bgcolor="#D46A4C"|3 |33.5 |3 |12.1 |1 |9.2 |0 |0.0 |0 |0.0 |0 |0.0 |0 |0.0 |0 |0.0 |0 |5.9 |0 |7 |- |align="left"|Area B |bgcolor="#D46A4C"|33.5 |bgcolor="#D46A4C"|2 |26.8 |2 |23.0 |2 |1.1 |0 |0.0 |0 |0.0 |0 |2.0 |0 |11.0 |1 |0.0 |0 |2.6 |0 |7 |- |align="left"|Area C |21.6 |2 |bgcolor="40BFF5"|33.6 |bgcolor="40BFF5"|2 |28.6 |2 |9.4 |0 |0.0 |0 |0.0 |0 |0.0 |0 |3.3 |0 |0.0 |0 |3.3 |0 |6 |- |align="left"|Area D |0.0 |0 |3.3 |0 |5.3 |0 |bgcolor="#99FF66"|44.8 |bgcolor="#99FF66"|3 |17.0 |1 |10.9 |1 |0.0 |0 |0.0 |0 |0.0 |0 |18.7 |1 |6 |- |align="left"|Area E |bgcolor="#D46A4C"|35.1 |bgcolor="#D46A4C"|2 |22.1 |2 |5.8 |0 |3.5 |0 |0.0 |0 |0.0 |0 |6.5 |0 |0.0 |0 |11.1 |0 |15.9 |1 |6 |- |align="left"|Area F |bgcolor="#D46A4C"|26.4 |bgcolor="#D46A4C"|2 |18.4 |1 |10.0 |1 |20.8 |1 |0.0 |0 |15.2 |1 |0.0 |0 |0.0 |0 |0.0 |0 |9.3 |0 |6 |- |align="left"|Area G |bgcolor="#D46A4C"|24.8 |bgcolor="#D46A4C"|2 |17.7 |1 |3.1 |0 |7.5 |0 |19.6 |1 |0.0 |0 |14.3 |1 |0.0 |0 |0.0 |0 |13.0 |0 |6 |- |align="left"|Area H |21.7 |2 |bgcolor="40BFF5"|27.4 |bgcolor="40BFF5"|2 |11.5 |1 |19.6 |1 |0.0 |0 |0.0 |0 |0.0 |0 |0.0 |0 |2.5 |0 |17.3 |1 |7 |- |- class="unsortable" class="sortbottom" style="background:#C9C9C9" |align="left"| Total |25.8 |15 |23.7 |13 |13.2 |7 |14.1 |6 |3.7 |2 |2.6 |2 |2.3 |1 |2.2 |1 |1.9 |1 |10.5 |3 |51 |-
1977: 2 x UUP, 2 x DUP, 2 x Alliance, 1 x SDLP<br /> 1981: 3 x DUP, 3 x UUP, 1 x Alliance<br /> 1977-1981 Change: DUP and UUP gain from Alliance and SDLP
1977: 3 x UUP, 2 x Alliance, 1 x DUP, 1 x UPNI<br /> 1981: 2 x DUP, 2 x UUP, 1 x Alliance, 1 x UPNI<br /> 1977-1981 Change: DUP gain from UUP
1977: 3 x Alliance, 2 x UUP, 1 x UPNI<br /> 1981: 2 x UUP, 2 x Alliance, 2 x DUP<br /> 1977-1981 Change: DUP (two seats) gain from Alliance and UPNI
1977: 4 x SDLP, 1 x Republican Clubs, 1 x Alliance<br /> 1981: 3 x SDLP, 1 x People's Democracy, 1 x IRSP, 1 x Independent Socialist<br /> 1977-1981 Change: People's Democracy and IRSP gain from Republican Clubs and Alliance, Independent Socialist leaves SDLP
1977: 2 x UUP, 1 x DUP, 1 x Alliance, 1 x Independent, 1 x Independent Unionist<br /> 1981: 2 x DUP, 2 x UUP, 1 x PUP, 1 x Anti H-Block<br /> 1977-1981 Change: DUP and Anti H-Block gain from Alliance and Independent, Independent Unionist joins PUP
1977: 2 x UUP, 1 x SDLP, 1 x DUP, 1 x Republican Clubs, 1 x Alliance<br /> 1981: 2 x DUP, 1 x SDLP, 1 x DUP, 1 x IRSP, 1 x Alliance<br /> 1977-1981 Change: DUP and IRSP gain from UUP and Republican Clubs
1977: 2 x UUP, 1 x SDLP, 1 x DUP, 1 x Republican Clubs, 1 x Alliance<br /> 1981: 2 x DUP, 1 x UUP, 1 x SDLP, 1 x IRSP, 1 x UDP<br /> 1977-1981 Change: DUP, PD and UDP gain from UUP, Republican Clubs and Alliance
1977: 2 x UUP, 2 x Alliance, 1 x SDLP, 1 x DUP, 1 x Independent Unionist<br /> 1981: 2 x UUP, 2 x DUP, 1 x SDLP, 1 x Alliance, 1 x Independent Unionist<br /> 1977-1981 Change: DUP gain from Alliance