Greater Sudbury (French: Grand Sudbury), also known as Sudbury, is the most populous city in Northern Ontario with a population of 166,004 in 2021. Greater Sudbury is the only single-tier municipality in Northern Ontario, the largest city in Ontario by area and the fifth largest in Canada. The city is separate from, but entirely surrounded by the Sudbury District.
The Sudbury region was inhabited by the Ojibwe people of the Algonquin group of the Anishinaabe prior to the founding of Sudbury after the discovery of nickel and copper ore in 1883 during the construction of the Canadian Pacific Railway. Greater Sudbury was formed in 2001 by merging the cities and towns of the former Regional Municipality of Sudbury with several previously unincorporated townships. Being located inland, the local climate is extremely seasonal, with average January lows of around −18 °C (0 °F) and average July highs of 25 °C (77 °F).