Elections to North Down Borough Council were held on 18 May 1977 on the same day as the other Northern Irish local government elections.

The election used four district electoral areas to elect a total of 20 councillors.

Note: "Votes" are the first preference votes.

1973: 3 x UUP, 2 x Alliance 1977: 2 x Alliance, 1 x UUP, 1 x UPNI, 1 x Independent Unionist 1973-1977 Change: UPNI and Independent Unionist gain from UUP (two seats) 1973: 2 x UUP, 2 x Loyalist, 1 x Alliance 1977: 2 x UUP, 1 x Alliance, 1 x Vanguard, 1 x DUP 1973-1977 Change: Vanguard and DUP gain from Loyalist (two seats) 1973: 2 x Alliance, 2 x UUP, 1 x Loyalist 1977: 2 x Alliance, 2 x UUP, 1 x Vanguard 1973-1977 Change: Loyalist joins Vanguard 1973: 2 x UUP, 2 x Alliance, 1 x Loyalist 1977: 2 x UUP, 2 x Alliance, 1 x UUUP 1973-1977 Change: UUUP gain from Loyalist