The Mattagami First Nation is an Anishnaabe First Nation band government - mainly Ojibwe, Oji-Cree and some Odawa - in the Canadian province of Ontario situated along the Mattagami River.

The First Nation members of the community primarily live on the Mattagami 71 reserve in the Sudbury District near Gogama.

Mattagami First Nation is part of the Wabun Tribal Council, a political organization which is also part of the Nishnawbe-Aski Nation (NAN), representing the Treaty 9 area.

The current chief of the Mattagami First Nation is Jennifer Constant.

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