Ontario Highway 17B

Highway 17B
Route information
Auxiliary route of Highway 17
Maintained by Ministry of Transportation of Ontario
Location
Country	Canada
Province	Ontario
Major cities	North Bay Garden River
Highway system
Ontario provincial highways Current Former 400-series
← Highway 17A → Highway 19
Former provincial highways Highway 18  →

Highway 17B was formerly the designation for six business routes of Highway 17, the main route of the Trans-Canada Highway through the Canadian province of Ontario. Each generally followed the original route of Highway 17 through the town or city that it served, and was subsequently given the Highway 17B designation when a newer bypass route was constructed to either reduce traffic pressure on the local street network, or provide a better thoroughfare that avoided urban areas altogether.

Four of the five original 17B routes have been decommissioned by the Ministry of Transportation (MTO), and are now maintained only by their local municipalities. However, in some cases the "Highway 17B" name may still be informally used by local residents to refer to the routes, and old highway shields may still be visible along the route in some locations. The lone remaining original 17B designation exists in North Bay. A new Highway 17B was designated in 2009, following a dispute between the MTO and the Garden River First Nation.

This article lists the various routes of Highway 17B by location, alphabetically. Current routes are listed first, followed by former routes.