Kingfisher First Nation (Oji-Cree language: ᑮᐡᑭᒪᓂᐦᓰᐋᐧᐴᕽ (Giishkimanisiiwaaboong, "At Kingfisher-waters"); unpointed: ᑭᐡᑭᒪᓂᓯᐊᐧᐳᐠ) is an Oji-Cree First Nation reserve located 350 kilometres (220 mi) north of Sioux Lookout, Ontario. It is accessible by air all year round, waterways during summer and ice roads in winter. As of December, 2009, the First Nation had a total registered population of 500 people, of which their on-Reserve population was 462. The community speaks the Oji-Cree language, with majority of the population being fluent in English as well.
Kingfisher Lake is policed by the Nishnawbe-Aski Police Service, an Aboriginal-based service.
In 1808 the Hudson's Bay Company established an outpost at Big Beaver House, which is located approximately 12 kilometres southwest of the present Kingfisher Lake reserve. Big Beaver House was frequented by Kingfisher Lake people for trading fur, community activity and freight hauling employment.
During 1929-1930 the leaders of Kingfisher Lake First Nation were required to gather at Big Trout Lake to participate in the signing of the adhesion to Treaty 9. As the result of this document, Kingfisher Lake was considered a part of Big Trout Lake Band.
In 1947, Ontario enacted the Trapline Registration and Fee Program which eventually forced the Kingfisher Lake people to outline their ancestral hunting areas into trapping boundaries and also to pay for the land use requirements.
In 1964 the leaders of Kingfisher Lake decide to establish permanent community and moved to the current location of the reserve lands. As Kingfisher Lake was already included in the Big Trout Lake Band and thus had reserve status, formality of gaining band status was achieved in 1975.