| Redstone River | |
| Pushpin Map: | Canada Ontario |
| Pushpin Map Caption: | Location of the mouth of the Redstone River in Ontario |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Ontario |
| Subdivision Type3: | Region |
| Subdivision Name3: | Northeastern Ontario |
| Subdivision Type4: | Districts |
| Length: | 87km (54miles) |
| Source1: | Redstone Lake |
| Source1 Location: | Sudbury, Unorganized, North Part, Sudbury District |
| Source1 Coordinates: | 47.9931°N -81.3°W |
| Source1 Elevation: | 366m (1,201feet) |
| Mouth: | Night Hawk Lake |
| Mouth Location: | Timmins, Cochrane District |
| Mouth Coordinates: | 48.4553°N -81.04°W |
| Mouth Elevation: | 274m (899feet) |
| River System: | James Bay drainage basin |
The Redstone River is a river in the James Bay drainage basin in Cochrane, Timiskaming and Sudbury Districts in northeastern Ontario, Canada.[1] It flows 87km (54miles) from Semple Lake to its mouth at Night Hawk Lake, the source of the Frederick House River.[2]
The Redstone river begins at Semple Lake in the northeast of the Unorganized North Part of Sudbury District at an elevation of 366m (1,201feet). It flows southeast to Redstone Lake, then heads northeast through the northwest strip of the Unorganized West Part of Timiskaming District and onward into the city of Timmins in Cochrane District. The river then reaches its mouth at the western side of Night Hawk Lake at an elevation of 274m (899feet). The lake empties via the Frederick House River, the Abitibi River and the Moose River to James Bay.