| Corner River | |
| Map: | Harricana map.png |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Ontario |
| Length: | 65.2km (40.5miles)[1] |
| Source1: | Corner Lakes |
| Source1 Location: | District of Cochrane, Ontario |
| Source1 Coordinates: | 50.1183°N -79.6658°W |
| Source1 Elevation: | 266m (873feet) |
| Mouth: | Harricana River |
| Mouth Location: | District of Cochrane, Ontario |
| Mouth Coordinates: | 50.9278°N -79.5356°W |
| Mouth Elevation: | 7m (23feet) |
The Corner River is a tributary of the Harricana River, flowing in the Cochrane District in Ontario, in Canada.
The surface of the river is usually frozen from early November to mid-May, but safe circulation on the ice generally occurs from mid-November to the end of April.
The major watersheds adjacent to the Corner River are:
The Corner River originates at the mouth of an unidentified lake (length: ; altitude:) belonging to a group of lakes identified as "Corner Lakes" in the eastern part of the Cochrane District.
The mouth of this lake of head is located at:
From its source, the Corner River runs more or less parallel to the Ontario and Quebec boundary, on in the following segments:
Corner River empties on the southwestern shore of the Harricana River in front of Low Shoal Island. This confluence is located at:
The hydronyme "River Corner" (English origin) is similar to the fact that the mouth of the river flows into a bend of river facing Low Shoal Island. Mariners navigating through the Harricana River through the southern part of the island to James Bay were passing by the river bend. The head lakes of this river are known as "Corner Lakes".