| Beaver River | |
| Pushpin Map: | Canada Ontario |
| Pushpin Map Caption: | Location of the mouth of the Beaver River in Ontario |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Ontario |
| Subdivision Type3: | Region |
| Subdivision Name3: | Central Ontario |
| Subdivision Type4: | District |
| Subdivision Name4: | Thunder Bay |
| Source1: | Unnamed muskeg |
| Source1 Coordinates: | 49.1461°N -90.6858°W |
| Source1 Elevation: | 478m (1,568feet) |
| Mouth: | Firesteel River |
| Mouth Coordinates: | 49.0506°N -90.78°W |
| Mouth Elevation: | 450m (1,480feet) |
| River System: | Hudson Bay drainage basin |
The Beaver River is a river in the west of Thunder Bay District in Northwestern Ontario, Canada.[1] It is part of the Hudson Bay drainage basin, and is a right tributary of the Firesteel River.
The river begins at an unnamed muskeg and travels south, passes under the Canadian Pacific Railway transcontinental main line and Ontario Highway 17, then heads southwest, and reaches its mouth at the Firesteel River about west of the community of Upsala.