Guelph is a city in Ontario, Canada.
Guelph may also refer to: Guelph (federal electoral district), consisting of the City of Guelph, Ontario Guelph (provincial electoral district), as the above University of Guelph, in the same city House of Welf, also known as the House of Guelph, a European noble family Guelphs and Ghibellines, political factions in medieval Italy Guelph Treasure, a collection of German medieval art The Guelph Party, an alternative name for the German-Hanoverian Party, a historical conservative political party in the German Empire and the Weimar Republic