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| Highway 10 Simcoe County Road 124 | |||||||
 Map of Hurontario Street | |||||||
| Namesake | Lake Huron and Lake Ontario | ||||||
| Maintained by | City of Mississauga City of Brampton Ontario Ministry of Transportation Town of Orangeville Town of Mono Township of Mulmur Township of Clearview Simcoe County Town of Collingwood | ||||||
| Location | Mississauga Brampton Caledon Orangeville Mono Collingwood | ||||||
| South end | Lakeshore Road in Mississauga | ||||||
| Major junctions |
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| North end | Side Launch Way in Collingwood | ||||||
| Construction | |||||||
| Inauguration | 1818[1] | ||||||
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Hurontario Street is a roadway running in Ontario, Canada between Lake Ontario at Mississauga and Lake Huron's Georgian Bay at Collingwood. Within Peel Region, it is a major urban thoroughfare within the cities of Mississauga and Brampton, which serves as the divide from which cross-streets are split into East and West, except at its foot in the historic Mississauga neighbourhood of Port Credit. Farther north, with the exception of the section through Simcoe County, where it forms the 8th Concession, it is the meridian for the rural municipalities it passes through. In Dufferin County, for instance, parallel roads are labelled as EHS or WHS for East (or West) of Hurontario Street.
Provincial Highway 10 follows the road through Caledon as far north as Orangeville. The highway designation formerly continued south through Brampton and Mississauga, but the highway was downloaded to both cities in 1997 due to its increasingly urbanized nature and the presence of the 400-series Highways 410 and 403. Highway 24 followed much of the street's northern section (as well as the central section where it ran concurrently with Highway 10) from near Glen Huron to Collingwood, but was also downloaded (to Simcoe County), as it was deemed by the province to be of insufficient importance to be retained in the highway system, and is now known as Simcoe County Road 124 through that stretch.
In addition to these two highways that followed most of its course, Highways 7 and 26 jogged along it for short distances through Brampton and Collingwood, respectively, before being rerouted.