| Pine River | |
| Pushpin Map: | Minnesota |
| Pushpin Map Caption: | Mouth of the river |
| Subdivision Type1: | Countries |
| Subdivision Type2: | Province |
| Subdivision Name2: | Ontario |
| Subdivision Type3: | State |
| Subdivision Name3: | Minnesota |
| Source1: | Fortune Lake [1] |
| Source1 Coordinates: | 48.1997°N -90.3942°W |
| Source1 Elevation: | 513m (1,683feet) |
| Mouth: | Granite Lake |
| Mouth Coordinates: | 48.1483°N -90.7781°W |
| Mouth Elevation: | 448m (1,470feet) |
| River System: | Winnipeg River |
The Pine River flows along the Minnesota-Ontario border a short distance, primarily within the Boundary Waters Canoe Area Wilderness and La Verendrye Provincial Park. The river is part of the Winnipeg River drainage basin and is a tributary of the Granite River.
From its source at Fortune Lake, the river first flows in a southwest direction through Prelate Lake, Addie Lake, and North Lake before reaching Gunflint Lake. From here, the river then flows north into Magnetic Lake, Clove Lake, and Granite Lake, at which point it joins the Granite River. The Granite River then continues northward along the border into Saganaga Lake.
By portaging around rapids, the Pine River is navigable by canoe.