Highway 15 is a highway in the Canadian province of Saskatchewan. It runs from Highway 4, five kilometres (3 mi) south of Rosetown, to Highway 16, four kilometres (2 mi) southeast of Bredenbury. Highway 15 is about 450 km (280 mi) long. The Outlook Bridge carries Highway 15 across the South Saskatchewan River.

Highway 4 is a major highway in the Canadian province of Saskatchewan. It runs from U.S. Route 191 at the United States border near Monchy to Highway 224 / Highway 904 in Meadow Lake Provincial Park. Highway 4 is about 652 km (405 mi) long.