| Caribou River | |
| Pushpin Map: | Canada Ontario |
| Pushpin Map Caption: | Location of the mouth of the Caribou River in Ontario |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Ontario |
| Subdivision Type3: | Region |
| Subdivision Name3: | Northwestern Ontario |
| Subdivision Type4: | District |
| Subdivision Name4: | Rainy River |
| Source1: | Wilson Lake |
| Source1 Coordinates: | 49.0214°N -91.1656°W |
| Source1 Elevation: | 447m (1,467feet) |
| Mouth: | Marmion Lake |
| Mouth Coordinates: | 48.9494°N -91.2686°W |
| Mouth Elevation: | 415m (1,362feet) |
| River System: | Hudson Bay drainage basin |
The Caribou River is a river in the Unorganized Part of Rainy River District in Northwestern Ontario, Canada.[1] The river is part of the Hudson Bay drainage basin. It runs from Wilson Lake to Upper Seine Bay on Marmion Lake. Marmion Lake flows via the Seine River, the Rainy River, the Winnipeg River and the Nelson River to Hudson Bay.