Mackenzie King Island is an island, part of the Queen Elizabeth Islands in northern Canada. The island spread south of Borden Island and north of Melville Island. Most areas of the island are in Northwest Territories. In Nunavut lies its easternmost area. The total area of Mackenzie King is about 5,048 square kilometers. This size makes it the 26th largest island in Canada and 115th largest island in the world.

