Donaghadee is a small town in County Down, Northern Ireland. It lies on the northeast coast of the Ards Peninsula, about east of Belfast and about six miles (10 km) south east of Bangor. It is in the civil parish of Donaghadee and the historic barony of Ards Lower.
It had a population of 6,470 people in the 2001 Census. There are several pubs in the town, including Grace Neill's, opened in 1611 as the "King's Arms", and which claims to be the oldest bar in all of Ireland, a record, however, held by Sean's Bar in Athlone.