Mansel Island (Inuktitut: Pujjunaq), a member of the Arctic Archipelago, is an uninhabited island in Qikiqtaaluk Region, Nunavut. It is located in Hudson Bay off Quebec's Ungava Peninsula. At 3,180 km² (1,230 sq mi) in size, it is the 159th largest island in the world, and Canada's 28th largest island. Its topography features a gently undulating limestone lowland with elevations not exceeding 100 m.

Mansel Island was named in 1613 by Sir Thomas Button after Vice-Admiral Sir Robert Mansell.