Old Wives Lake (Assiniboine: Wagą́ganati wakpá ) is a shallow saline lake in south central Saskatchewan, Canada, about 30 km southwest of Moose Jaw. The lake is fed by the Wood River but seasonal water relatively flattened the terrain, and as such results in significant mudflats. A Migratory Bird Sanctuary was established at the lake on March 9, 1925. This lake, in conjunction with Reed Lake and Chaplin Lake, forms a site of hemispheric importance in the Western Hemisphere Shorebird Reserve Network. It was designated in April 1997, and is "one of the most important inland sites for migratory birds in North America". A variety of First Nations oral traditions explain the origin of the lake's name.