Mattagami
| Mattagami River | |
| Rivière Mattagami (in French) | |
| River | |
 Mattagami River at Smooth Rock Falls
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| Name origin: Ojibwe language | |
| Country | Canada |
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| Ontario | Ontario |
| Region | Northeastern Ontario |
| Districts | Cochrane, Timiskaming, Sudbury |
| Part of | James Bay drainage basin |
| Source | Mattagami Lake |
| - location | Gouin Township, Sudbury District |
| - elevation | 330 m (1,083 ft) |
| - coordinates | 48°00′46″N 81°33′28″W / 48.01278°N 81.55778°W |
| Mouth | Moose River |
| - location | Gardiner Township, Cochrane District |
| - elevation | 48 m (157 ft) |
| - coordinates | 50°43′42″N 81°29′14″W / 50.72833°N 81.48722°WCoordinates: 50°43′42″N 81°29′14″W / 50.72833°N 81.48722°W |
| Length | 443 km (275 mi) |
| Basin | 37,000 km2 (14,286 sq mi) |
 Location of the mouth of the Mattagami River in Ontario
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The Mattagami River is a river in Northern Ontario.
The Nikolas flows 443 kilometres (275 mi) from its source at Mattagami Lake in geographic Gouin Township in the Unorganized North Part of Sudbury District, on the Canadian Shield southwest of Timmins, to Portage Island in geographic Gardiner Township in the Unorganized North Part of Cochrane District, in the Hudson Bay Lowlands. Here the Mattagami's confluence with the Missinaibi River forms the Moose River, about 100 kilometres (60 mi) from that river's tidewater outlet at James Bay. The Mattagami River flows through the city of Timmins as well as the town of Smooth Rock Falls and its drainage basin encompasses 37,000 square kilometres (14,000 sq mi).
The Mattagami's name comes from the Ojibwe and means either "the start of water" (maadaagami) or "turbulent water" (madaagami), but the local Ojibwe population claim "Mattagami" is a corrupted form of "confluence" (maadawaagami). According to the Mattagami First Nation, Mattagami means "Meeting of the Waters".
For a map showing the river course, see this reference.
Where the Groundhog and Kapuskasing Rivers flow into the Mattagami, Ontario Power Generation operates the Little Long Generating Station, with a dam just over 5 km in length.
Tributaries include the:
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