Highway 51 is a highway in the Canadian province of Saskatchewan. It runs from the Alberta border near Compeer, Alberta, where it is preceded by Highway 12, to Highway 4 in Biggar, 1.1 km (0.7 mi) south of Highway 14. Highway 51 is approximately 155 km (96 mi) long. It passes through the town of Kerrobert, where it shares a 2.4 km (1.5 mi) concurrency with Highway 21 and Highway 31.