Bangor (Irish: Beannchor) is a large town in County Down, Northern Ireland, with a population of 76,388 people in the 2001 Census, making it the most populous town in Northern Ireland and the third most populous settlement in Northern Ireland. It is a seaside resort situated on the southern side of Belfast Lough and is situated in the Belfast Metropolitan Area. Bangor Marina is one of the largest in Ireland, and holds Blue Flag status. In 2007, the town was voted by UTV viewers as the most desirable place to live in Northern Ireland. .

It is primarily residential and can be viewed as a commuter town for the Greater Belfast area, from which it is linked by the A2 road and a direct railway line. Bangor is situated 13.6 miles (22 km) from the heart of Belfast and thirty minutes by train or bus with George Best Belfast City Airport even closer.

Bangor is part of the North Down Borough Council area and is twinned with the Austrian city of Bregenz, and the US city of Virginia Beach. The Mayor of Bangor is Stephen Farry. It is also host to the Royal Ulster and Ballyholme Yacht clubs. Tourism is important, particularly in the summer months, and plans are being made for the redevelopment of the seafront; a notable building in the town is Bangor Old Custom House. The largest remaining individual land owner in the area is the Clandeboye Estate, located a few miles from the town centre.