London is a city in Southwestern Ontario, Canada along the Quebec City-Windsor Corridor with a metropolitan area population of 457,720; the city proper had a population of 352,395 in the 2006 Canadian census.

London is the seat of Middlesex County, at the forks of the non-navigable Thames River, approximately halfway between Toronto, Ontario and Detroit, Michigan. London and the surrounding area (roughly, the territory between Guelph and Windsor) is collectively known as Southwestern Ontario. The City of London is a single-tier municipality, politically separate from Middlesex County though it remains the official county seat.