| Mackenzie King Island | |
| Pushpin Map: | Canada Northwest Territories#Canada Nunavut#Canada |
| Native Name Link: | Inuktitut |
| Location: | Northern Canada |
| Coordinates: | 77.75°N -112°W |
| Archipelago: | Queen Elizabeth Islands Arctic Archipelago |
| Area Km2: | 5,048 |
| Length Mi: | 61 |
| Width Mi: | 60 |
| Elevation M: | 112 |
| Country: | Canada |
| Country Admin Divisions Title: | Territory |
| Country Admin Divisions: | Northwest Territories Nunavut |
| Country Admin Divisions Title 1: | Qikiqtaaluk Region |
| Population: | 0 |
Mackenzie King Island is one of the uninhabited Queen Elizabeth Islands in northern Canada. It lies north of Melville Island and south of Borden Island, and like them is divided when it comes to administration. Most of the island is in Northwest Territories, while its easternmost portion lies in Nunavut. The border runs along the 110th meridian west.
Mackenzie King has an area of 5048km2, 60miles long in northeast or 47miles in southeast and 60miles wide, making it the 116th largest island in the world, and Canada's 26th largest island.
The first known visit to the island was by Vilhjalmur Stefansson in 1915, and it was later named for William Lyon Mackenzie King.[1]