King's Highway 20, commonly referred to as Highway 20, is a provincially maintained highway in the Canadian province of Ontario. Presently, it is a short 1.9 km (1.2 mi) stub between Highway 58 and Niagara Regional Road 70 in the City of Thorold, but until 1997 it connected Hamilton to Niagara Falls, serving several towns atop the Niagara Escarpment en route.