The king eider (Somateria spectabilis) is a large sea duck that breeds along Northern Hemisphere Arctic coasts of northeast Europe, North America and Asia.

The King Eider is a uniquely patterned sea-duck of the far northern extremes of North America. They are strongly tied to salt-water habitats in most seasons, although they can be found on inland freshwater lakes of the far north during the summer breeding season. They are gregarious and often found in very large flocks, with flocks in migration sometimes exceeding 10,000 individual birds.