The A22 is a medium-length A-road in northern County Down.
It starts on the A20 in Dundonald, a place that may or may not be a suburb of Belfast. It heads southeastwards and soon reaches Comber. Originally the A22 went straight through town but but it now bypasses it to the west. The road passes underneath the A21 before meeting it at the next roundabout. The two roads cannon off each other, with the A21 continuing as the (primary) bypass, whilst the A22 continues south as a non-primary road.
For the remainder of its distance the A22 follows the western edge of Strangford Lough, an inlet of the sea. To begin with the road is some distance from the water - it gets closer as it travels, although the sea is never really visible. The A22 bends sharply right at Killyleagh to follow an inlet of the lough. The road shortly crosses the River Quoile and enters Downpatrick. The road meets the A25 on the northern side of town and it would be assumed that the A22 ends here. However, signage suggests that the A22 actually continues slightly further (as a useless multiplex along the A25) to end at the A7 roundabout.