| Meduncook River | |
| Mouth Coordinates: | 43.945°N -69.325°W |
| Subdivision Type1: | Country |
| Length: | about 7miles |
| Tributaries Right: | Back River |
The Meduncook River is a 7adj=midNaNadj=mid[1] river in Knox County, Maine. From its source (44.0178°N -69.2842°W) in Friendship, the river runs about 1 mile south to the head of its estuary, then about 6 miles southwest to Muscongus Bay. The estuary forms part of the border between Friendship and Cushing.