| Montreal River | |
| Pushpin Map: | Canada Ontario |
| Pushpin Map Caption: | Location of the mouth of the Montreal River in Ontario |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Ontario |
| Subdivision Type4: | Districts |
| Length: | 130km (80miles) |
| Source1: | Montreal Lake |
| Source1 Location: | Island Lake, Sudbury District |
| Source1 Coordinates: | 47.7067°N -83.5639°W |
| Source1 Elevation: | 447m (1,467feet) |
| Mouth Location: | Montreal River Harbour, Algoma District |
| Mouth Coordinates: | 47.2389°N -84.6458°W |
| Mouth Elevation: | 180m (590feet) |
The Montreal River is a river in Algoma and Sudbury Districts, Ontario, Canada. It is a tributary of Lake Superior.
The river begins at Montreal Lake at the community of Island Lake in northwest Sudbury District. It heads southwest, passes into Algoma District, reaches the 400NaN0 forebay lake above Montreal Falls, and then the settlement and railway station of Montreal Falls themselves on the Algoma Central Railway. It heads west, and passes under Ontario Highway 17 just before reaching its mouth at Lake Superior at the community of Montreal River Harbour.
There are four hydroelectric dams and generating stations on the Montreal River, all owned and operated by Brookfield Renewable Power. In upstream order, they are Andrews Generating Station (57.78 MW; head of 57.78m (189.57feet); next to Highway 17);[1] Hogg Generating Station (17.4 MW; head of 24m (79feet));[2] Gartshore Generating Station (23 MW; head of 35m (115feet));[3] and MacKay Generating Station, at Montreal Falls (62 MW; head of 75.3m (247feet)).[4]