Aberdeen Lake is a large, irregularly shaped lake in Kivalliq Region, Nunavut, Canada. It is located on the Canadian Shield. The lake measures nearly 90 km east-west with a peninsula in the center separating the lake into almost two halves which extend nearly 30 km north-south. The Thelon Wildlife Sanctuary is to the west. The Thelon River is the lake's primary inflow and outflow. Beverly Lake and Schultz Lake are nearby.