Aberdeen Lake is a large, irregularly shaped lake in Kivalliq Region, Nunavut, Canada. It is located on the Canadian Shield. The lake measures nearly east-west with a peninsula in the center separating the lake into almost two halves which extend nearly north-south. The Thelon Wildlife Sanctuary is to the west.
The Thelon River is the lake's primary inflow and outflow. The lake is downstream from Beverly Lake and upstream from Schultz Lake.