| Mattagami 71 | |
| Official Name: | Mattagami Indian Reserve No. 71 |
| Settlement Type: | Indian reserve |
| Pushpin Map: | Canada Ontario |
| Pushpin Mapsize: | 200 |
| Coordinates: | 47.8°N -112°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Type2: | District |
| Subdivision Name2: | Sudbury |
| Subdivision Type3: | First Nation |
| Subdivision Name3: | Mattagami |
| Area Land Km2: | 45.93 |
| Population Footnotes: | [1] |
| Population Total: | 193 |
| Population As Of: | 2011 |
| Population Density Km2: | 4.2 |
| Website: | mattagami.com |
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. The on-reserve population is approximately 100 residents.
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 Chad Boissoneau.
The reserve has its own elementary school, while high school students have the option to attend Keewaytinook Internet High school in the community or they are bused to Timmins.