What is the largest uninhabited island in Canada?

Devon Island in Baffin Bay. It's not just the largest uninhabited island in Canada, but also in the world.

Devon Island is part of the Arctic Archipelago and is the second-largest in the Queen Elizabeth island group. With an area of 55,247 km2 (21,333 sq mi), it's also Canada's sixth-largest island. It is nearly as big as Croatia.

The island was "discovered" by European explorers in 1616 and later named after Devon in England. While it has been home to Inuit peoples, the harsh climate and collapse of fur prices led to people voting with their feet (so to speak.)

https://en.wikipedia.org/wiki/Devon_Island