Katepwa Lake is a recreational lake in the Qu’appelle Valley in the Canadian province of Saskatchewan. The lake's name likely originated from the Cree word Kahtapwao, which means "What is calling?" Katepwa Lake is eastern most and farthest downstream of four lakes along the Qu'Appelle River known as the Fishing Lakes. Highway 56 runs along the eastern and southern shore and Highway 619 runs along the south-eastern shore.

The Qu'Appelle River is a river in the Canadian provinces of Saskatchewan and Manitoba that flows 430 kilometres (270 mi) east from Lake Diefenbaker in south-western Saskatchewan to join the Assiniboine River in Manitoba, just south of Lake of the Prairies, near the village of St. Lazare. It is in a region called the Prairie Pothole Region of North America, which extends throughout three Canadian provinces and five U.S. states. It is also within Palliser's Triangle and the Great Plains ecoregion.