London is a city in Southwestern Ontario, Canada, situated along the Quebec City – Windsor Corridor. The city has a population of 352,395, and the metropolitan area has a population of 457,720, according to the 2006 Canadian census; the metro population in 2009 was estimated at 489,274. The city is named after London, England. London is the seat of Middlesex County, at the forks of the non-navigable Thames River, approximately halfway between Toronto, Ontario and Detroit, Michigan. The City of London is a separated municipality, politically separate from Middlesex County, though it remains the official county seat.

London was first settled by Europeans between 1801 and 1804 by Peter Hagerman and became a village in 1826. Since then, London has grown into the largest Southwestern Ontario municipality, annexing many of the smaller communities that surrounded it. The city has developed a strong focus towards education, health care, tourism, and manufacturing.

London is home to Fanshawe College and the University of Western Ontario, which contributes to the city's reputation as an international centre of higher education, scientific research and cultural activity. The city hosts a number of musical and artistic exhibits. London's festivals contribute to its tourism industry, but its economic activity is centred on education, medical research, insurance, and information technology. London's university and hospitals are among its top ten employers. London lies at the junction of Highway 401 and 402, connecting it to Toronto, Detroit, and Sarnia, but lacks an internal freeway. It also has an international airport, train and bus station.