East Bay is a waterway in Kivalliq Region, Nunavut, Canada. It is located in Hudson Bay off eastern Southampton Island. Caribou Island lies to the north of the bay's mouth.
The habitat is characterized by tundra, sedge, grassy meadows, inlets, coastal marine features, rocky flats and barrens. The elevation rises up to 122 m (400 ft) above sea level.
East bay is a notable bird area. It is designated as a migratory bird sanctuary, Important Bird Area, and Key Migratory Bird Terrestrial Habitat.