Great Lakes Areas of Concern are designated geographic areas within the Great Lakes Basin that show severe environmental degradation. There are a total of 43 areas of concern within the Great Lakes, 26 being in the United States, 17 in Canada, with five shared by the two countries.

The Great Lakes, the largest system of fresh water lakes in the world, are shared by the United States and Canada. They make up 95% of the surface freshwater in the contiguous United States and have 10,000 miles of coastline (including connecting channels, mainland and islands)—more than the contiguous United States' Pacific and Atlantic coastlines combined. The lakes are a system of transport and shipping, as well as a place of recreation.