Ontario Highway 72

Highway 72
Route information
Maintained by the Ministry of Transportation of Ontario
Length	68.5 km[1] (42.6 mi)
Existed	October 6, 1937[2]–present
Major junctions
South end	Highway 17 in Dinorwic
Major intersections	Highway 664 – Hudson
North end	Highway 642 in Sioux Lookout
Location
Country	Canada
Province	Ontario
Highway system
Ontario provincial highways Current Former 400-series
← Highway 71 → Highway 77
Former provincial highways Highway 73  →

King's Highway 72, commonly referred to as Highway 72, is a provincially maintained highway in the northern half of the Canadian province of Ontario. The highway connects Highway 17 in Dinorwic with the town of Sioux Lookout, where there are connections with Highway 516 towards Savant Lake and Highway 642 towards Silver Dollar.

Highway 72 was built as a trunk route by 1920, and became a provincial highway in 1937. It has remained largely unchanged since then, aside from the reconstruction and realignment of the Frog Rapids bridge, and the renumbering of the fork towards Hudson as Highway 664. The length of the highway is 68.5 km (42.6 mi), the entirety of which is situated in Kenora District. There are no significant settlements between its endpoints.