Steeles Avenue is an east–west street that stretches 77.5 km (48.2 mi) across the western and central Greater Toronto Area in Ontario, Canada. Running from Appleby Line in Milton in the west to the Scarborough-Pickering Townline in the east, where it continues east into Durham Region as Taunton Road, which itself extends 58 km (36 mi) across the length of Durham Region to its boundary with Northumberland County. It is most notable for being the north city limit of Toronto where it borders the southern limit of York Region along its eastern half.
York Region refers to Steeles Avenue as York Regional Road 95 but this use is only internal and there are no signs posted; as the street borders and is maintained by the City of Toronto. Through Peel and Halton Regions, the road is signed as Peel Regional Road 15 and Halton Regional road 8, respectively.