A21 (Northern Ireland)

A21
The route of the A21 in red from Bangor to Ballynahinch.
A21 Newtownards Road at Conlig
Location
Country	United Kingdom
Constituent country	Northern Ireland
Primary destinations	Bangor Newtownards Comber Ballygowan Ballynahinch
Road network
Roads in Northern Ireland Motorways A roads in Northern Ireland

The A21, also Comber road, is a road in County Down in Northern Ireland. The route commences in Bangor, passing through Newtownards, Comber, and Ballygowan, and finishes on the northern outskirts of Ballynahinch.

There are two dual carriageway sections; between Bangor and Newtownards, and between Newtownards and Comber. The second of these passes through farmland near the northern shores of Strangford Lough. This section also passes within 2 miles of Scrabo Tower.