King's Highway 400A, once known as the Highway 400 Extension, is an unsigned 400-series highway in the Canadian province of Ontario. The short 1.1-kilometre (0.7 mi) freeway stub connects Highway 400 with Highway 11 and Simcoe County Road 93, formerly Highway 93. The highway was created in late 1959 by the opening of Highway 400 to Coldwater, although it has always featured Highway 400 signage along the southbound lanes and Highway 11 signage northbound.