Radisson Lake is an endorheic salt lake located in the Rural Municipality of Great Bend No. 405 in southern Saskatchewan, situated approximately 1.7 kilometres north of the town of Radisson and about 56 kilometres west-northwest of Martensville. As an endorheic basin, the lake has no outflows, which contributes to its saline character. The lake sits in the ecological transition zone between mixed grassland and aspen parkland.

Access to the lake is via Rural Road, which connects to Highway 340. The Yellowhead Highway runs along the southern shore, making the lake relatively reachable by vehicle.

The entire lake and its surrounding shoreline are designated as an Important Bird Area (IBA) of Canada, covering a total area of 17.07 square kilometres including the lake and adjacent land. The habitat supports geese, swans, ducks, piping plovers, and whooping cranes. Paddlers should be aware that the beaches along the northwestern shore and the east-side bay are designated as critical piping plover habitat, with shoreline protections extending to the highwater mark. This designation limits development and may affect where paddlers can land or access the shore in those areas.

The lake is also located within the Radisson Lake Game Preserve. Given its salt lake character, endorheic hydrology, and the ecological sensitivities of the surrounding habitat, paddlers should approach the area with awareness of wildlife disturbance concerns, particularly during nesting seasons. The lake is named after Pierre-Esprit Radisson, the French coureur des bois and explorer whose work was instrumental in the founding of the Hudson's Bay Company.

No bathymetric depth charts are available for Radisson Lake, so water depth information for navigation planning is limited.