The City of Guelph (IPA: gwelf) (2004 population 125,872, metropolitan population 155,635) is a city located in southwestern Ontario, Canada, roughly 100 kilometres west of downtown Toronto at the intersection of Ontario provincial highway 6 and Ontario provincial highway 7. It is the seat of Wellington County but is, in many respects, politically autonomous from the county itself.

One of the first planned communities in Canada, Guelph was founded on St. George’s Day, April 23, 1827. It was selected as the headquarters of the Canada Company, a British development firm, by its Canadian Superintendent John Galt. The directors of the Canada Company, Galt's employers, had actually wanted the city to be named Goderich, but reluctantly accepted the fait accompli.