Onigam Lake is a lake in the Hudson Bay drainage basin in Unorganized Kenora District in Northwestern Ontario, Canada. It is about 6.5 kilometres (4.0 mi) long and .4 kilometres (0.2 mi) wide, and lies at an elevation of 93 metres (305 ft). The primary outflow is an unnamed river at the west, which flows downstream through an unnamed lake a total distance of 5.8 kilometres (3.6 mi) to the Sturgeon River at (55°21′09″N90°41′54″W), about 5.3 kilometres (3.3 mi) upstream from Sturgeon Lake.