Burnhamthorpe Road is a major arterial road in the cities of Toronto and Mississauga, Ontario; beginning at Dundas Street (from which it initially angles away from before running parallel with), near Islington Avenue, running west and becoming a rural road in the Town of Oakville, where it terminates (after breaking) at Tremaine Road, where it changes name. In Mississauga, the street, unlike most other arterial roads in the regional municipalities surrounding Toronto proper, is not a regional road. However, in Oakville it is signed as Halton Regional Road 27 as far west as Neyagawa Boulevard.