There are many classes of roads in Ontario, Canada, including provincial highways (which is further broken down into the King's Highways, the 400-series, Secondary Highways, Tertiary Highways, and the 7000-series), county (or regional) roads, and local municipal routes.
See main article: Ontario Provincial Highway Network, List of Ontario provincial highways and List of former Ontario provincial highways.
See main article: cat and Ontario provincial highways.
See main article: List of controlled-access highways in Ontario.
See main article: List of county roads in Ontario.
See main article: cat and Ontario county roads.
See main article: List of numbered roads in Chatham-Kent.
See main article: List of roads in Hamilton, Ontario.
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See main article: List of numbered roads in Greater Sudbury.
See main article: List of numbered roads in Kawartha Lakes.
See main article: List of roads in London, Ontario.
See main article: cat.
See main article: Transportation in Markham, Ontario.
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See main article: List of roads in Mississauga.
See main article: List of numbered roads in Ottawa and List of roads in Ottawa.
See main article: cat and Roads in Ottawa.
See main article: Lists of roads in Toronto and Transportation in Toronto.
See main article: cat and Streets in Toronto.
See main article: cat and Transport in Vaughan.
See main article: List of roads in Windsor, Ontario.