Mosfellsbær is a town in south-west Iceland, sitting on the southern shore of Faxa Bay, some 12 kilometres (7 miles) east of the country's capital, Reykjavík.

Its latitude is 64° N, making Reykjavik the northern-most capital in the world.
 

The town of Mosfellsbær is only a 15-minute drive from midtown Reykjavík.