|Lake type||Glacial lake|
|Primary inflows||Churchill River|
|Primary outflows||Fond du Lac River, Cochrane River|
|Catchment area||23,310 km²|
|Surface area||2286 km² |
|Average depth||20.6 m |
|Max. depth||71.0 m|
|Water volume||75 km³ |
|Shore length1||1475 km |
|Surface elevation||398 m |
|Settlements||Wollaston Lake, Saskatchewan|
|1 Shore length is not a well-defined measure.|
Wollaston Lake is located in northeastern Saskatchewan, Canada. With a surface area of 2286 km² (excluding islands; 2681 km² if islands are included), it is the largest bifurcation lake in the world that drains naturally in two directions.
The Cochrane River flows out of the northeastern side of the lake and into Reindeer Lake, which drains via the Churchill River system into Hudson Bay. Wollaston Lake is also the largest lake entirely within Saskatchewan, although the Saskatchewanian portions of Lake Athabasca and Reindeer Lake are both larger.
Samuel Hearne learned of the lake in 1770 and David Thompson noted in 1796 the dual outlets as “perhaps without parallel in the world.” In 1807, Peter Fidler named the lake after George Hyde Wollaston.
The only settlement on its shores is also named Wollaston Lake. The settlement includes the northern hamlet of Wollaston Lake with a population of 129  and the adjacent village of Wollaston Post of the Hatchet Lake Dene Nation with a population of 1251.
Access to the lake is provided by the community airstrip (Wollaston Lake Airport) and an all-weather road (Highway 905) to La Ronge. This road passes by the western side of the lake, while the community of Wollaston Lake is located on the eastern side, but the lake can be crossed by a winter road when the lake is frozen (November through June) and by the Wollaston barge when it is not. Air service is also provided to Points North Landing, a service centre for nearby uranium mines. This industry provides jobs for local residents, but has raised concerns over possible contamination of the lake.
Fish species 
- Data Summary
- Natural Resources Canada
- The Atlas of Canada - Parks and Environment
- "Ministry of Municipal Affairs-Northern Settlement of WOLLASTON LAKE". Retrieved 2012-10-28.
- "Statistics Canada. 2012. Lac La Hache 220, Saskatchewan". Retrieved 2012-10-28.
- Wollaston Lake
- Wollaston Lake