Elections to North Down Borough Council were held on 5 May 2005 on the same day as the other Northern Irish local government elections.

The election used four district electoral areas to elect a total of 25 councillors.

Note: "Votes" are the first preference votes.

2001: 2 x UUP, 2 x DUP, 1 x Alliance, 1 x UKUP 2005: 3 x DUP, 2 x UUP, 1 x Alliance 2001-2005 Change: DUP gain from UKUP 2001: 2 x Independent, 2 x UUP, 1 x Alliance, 1 x DUP, 1 x Women's Coalition 2005: 2 x DUP, 2 x UUP, 2 x Independent, 1 x Alliance 2001-2005 Change: DUP gain from Women's Coalition 2001: 2 x UUP, 2 x Alliance, 1 x UKUP, 1 x DUP, 1 x Independent 2005: 2 x DUP, 2 x UUP, 2 x Alliance, 1 x Green 2001-2005 Change: DUP gain from UKUP, Independent joins Greens 2001: 2 x UUP, 1 x Alliance, 1 x DUP, 1 x Independent 2005: 2 x UUP, 2 x Alliance, 1 x DUP 2001-2005 Change: Alliance gain from Independent