DONAGHADEE, a market town of Co. Down, Ireland, near the south of Belfast Lough, 25 m. E. by N. of Belfast by rail. Pop. (1926), 2,534. It is 212 m. S.W. of Portpatrick in Wigtown shire, with which it is connected by telegraph and telephone cables. To the north-east is a rath or encampment 7o ft. high. The parish church dates from 1626. There are two holy wells, and the town is a seaside resort.