Highway 11B is the designation for ten business routes of Highway 11 in the Canadian province of Ontario. All but one was the original route of Highway 11 through the town or city that it served, and was subsequently given the 11B designation when a newer bypass route was constructed to reduce traffic pressure on the urban street network. Seven of the nine sections of Highway 11B have now been decommissioned by the Ministry of Transportation, with the exception of the Atikokan route and the southernmost section of the former Tri-Town route between Cobalt and Highway 11.