| Willow River | |
| Pushpin Map: | Minnesota |
| Pushpin Map Caption: | Mouth of the Willow River |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Minnesota |
| Subdivision Type3: | County |
| Subdivision Name3: | Pine County |
| Mouth Coordinates: | 46.3197°N -92.8466°W |
| River System: | Kettle River |
The Willow River is a 31.4adj=midNaNadj=mid[1] tributary of the Kettle River in eastern Minnesota in the United States. It is one of three rivers by that name in Minnesota. Via the Kettle and St. Croix rivers, it is part of the watershed of the Mississippi River.
The Willow River flows for its entire length in northern Pine County. It rises in the Nemadji State Forest in Nickerson Township and flows generally westwardly through Kerrick, Windemere, Norman and Kettle River townships, past Duquette. In Windemere Township it collects the Little Willow River, which rises at the town of Kerrick and flows [1] through Bruno and Norman townships. The Willow joins the Kettle River at the town of Willow River.