| Magpie River | |
| Native Name: | [1] |
| Name Other: | Rivière Magpie |
| Pushpin Map: | Canada Ontario |
| Pushpin Map Caption: | Location of the mouth of the Magpie River in Ontario |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Ontario |
| Subdivision Type3: | Region |
| Subdivision Name3: | Northeastern Ontario |
| Subdivision Type4: | District |
| Subdivision Name4: | Algoma |
| Source1: | Upper Magpie Lake |
| Source1 Coordinates: | 48.6347°N -84.6217°W |
| Source1 Elevation: | 420m (1,380feet) |
| Mouth: | Lake Superior |
| Mouth Coordinates: | 47.9339°N -84.8497°W |
| Mouth Elevation: | 180m (590feet) |
| Basin Size: | 1900km2 |
| Tributaries Left: | Michipicoten River |
The Magpie River is a river in Algoma District, northeastern Ontario, Canada, The river empties into Michipicoten Bay on Lake Superior near the town of Wawa. The river drains an area of about 1900km2.
The river begins at Upper Magpie Lake at an elevation of 420m (1,380feet) and flows north then northeast through a series of lakes including Wejinabikun Lake and North Wejinabikun Lake, to a point at 48.7233°N -84.5583°W at an elevation of 357m (1,171feet), before turning southeast to enter Mosambik Lake at an elevation of 347m (1,138feet). The river exits at the north end of the lake and heads further north, and reaches a point as far north as 48.7272°N -84.4939°W at an elevation of 348m (1,142feet), before heading east southeast into the northeast corner of Esnagi Lake. From the north end of Esnagi Lake, the Five Mile Portage leads north, over Five Mile Creek, to Five Mile Bay on Kabinakagami Lake on the Kabinakagami River, part of the Albany River system, which leads north to James Bay. An alternate route to James Bay is to take the further Pine Portage from Kabinakagami Lake then up the Oba River to the Albany Forks, from which the Mattawitchewan River flows downstream as part of the Missinaibi and Moose rivers into the bay.
At Esnagi Lake, the river takes in the right tributary Tripoli Creek. The Magpie river then leaves Esnagi Lake at the south end where the Canadian Pacific Railway transcontinental mainline crosses. It continues south, passes over the Jean Falls, and takes in the left tributary Peckerwood Creek at an elevation of 339m (1,112feet). The river takes in the left tributary Hobon Creek just upstream of the community of Dubreuilville. There, it takes in the left tributary Herman Creek, is crossed by Highway 519, and takes a sharp turn west. The Soderston Creek enters from the right, and the river passes over the Toolong Rapids, where it once again heads south. The Evans Creek enters from the right, and the Magpie River passes over the Cedar Falls, then further downstream the Steephill Falls. The river takes in the right tributary Catfish Creek, and reaches Wawa, where it is crossed by the Algoma Central Railway branch line to Michipicoten Harbour and Highway 17. The river then passes over the Magpie Falls, and takes in the Michipicoten River just before its mouth at Michipicoten Bay on Lake Superior at the site of Michipicoten Provincial Park.
There are also several hydroelectric plants on the river. The largest hydroelectric is located at Steephill Falls.
thumb|Scenic High Falls on the Magpie River
To protect the natural landmark, the Innu Council of Ekuanitshit and the Minganie Regional County Municipality declared the Mutuhekau Shipu a legal person in 2021. Now the river has nine rights, among them the right to flow, maintain biodiversity, be free from pollution, and to sue.