Highway 21 is a highway in the Canadian province of Saskatchewan. It runs from Montana Secondary Highway 233 at the United States border near Willow Creek to Highway 950/Highway 919 within the Meadow Lake Provincial Park. Highway 21 is about 715 km (444 mi) long. Highway 21 passes through the major communities of Maple Creek, Kindersley, Kerrobert, and Unity. Highway 21 intersects three major western Saskatchewan highways: Highway 1, Highway 7, and Highway 16.