Nipissing District is a district in Northeastern Ontario in the Canadian province of Ontario. It was created in 1858. The district seat is North Bay.
In 2021, the population was 84,716. The land area is 16,986.20 square kilometres (6,558.41 sq mi); the population density was 5.0 per square kilometre (13/sq mi), making it one of the most densely populated districts in northern Ontario.
Northeastern Ontario is a secondary region of Northern Ontario in the Canadian province of Ontario, which lies north of Lake Huron and east of Lake Superior. Greater Sudbury is its largest settlement.
Northeastern Ontario consists of the districts of Algoma, Sudbury, Cochrane, Timiskaming, Nipissing and Manitoulin. For some purposes, Parry Sound District and Muskoka District Municipality are treated as part of Northeastern Ontario although they are geographically in Central Ontario. These two divisions are coloured in green on the map.
Unorganized South Nipissing District is an unorganized area in north-central Ontario, in the District of Nipissing. It is almost entirely within and includes most of Algonquin Provincial Park.
The unorganized area is gradually being reduced in size. In 1971, a portion was added to Lake of Bays Township in Muskoka District, and between 1996 and 2001, its area shrunk from 7,792.97 square kilometres (3,008.88 sq mi) to 6,704.68 square kilometres (2,588.69 sq mi), because of annexation by surrounding incorporated townships.