| Poplar River | |
| Pushpin Map: | Canada Ontario |
| Pushpin Map Caption: | Location of the river mouth 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: | Nipissing |
| Length: | 2km (01miles) |
| Source1: | Poplar Lake |
| Source1 Coordinates: | 46.6617°N -79.6403°W |
| Source1 Elevation: | 294m (965feet) |
| Mouth: | Bear Lake |
| Mouth Coordinates: | 46.645°N -79.6289°W |
| Mouth Elevation: | 294m (965feet) |
| River System: | Great Lakes Basin |
The Poplar River is a river in the Unorganized North part of Nipissing District in northeastern Ontario, Canada.[1] It is in the Great Lakes Basin.
The Poplar River begins at Poplar Lake in geographic Gladman Township[2] and flows 2km (01miles) south to its mouth at Bear Lake in geographic Hammell Townwship.[3] Bear Lake flows via Tilden Lake, the Tomiko River, the Sturgeon River, Lake Nipissing and the French River to Georgian Bay on Lake Huron.