| Mill River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Vermont |
| Subdivision Type3: | County |
| Subdivision Name3: | Rutland |
| Subdivision Type5: | Towns |
| Subdivision Name5: | Mount Holly, East Wallingford, Shrewsbury, Clarendon |
| Length: | 28.7km (17.8miles) |
| Source1 Location: | Mount Holly, Vermont |
| Source1 Coordinates: | 43.4043°N -72.8011°W |
| Source1 Elevation: | 650m (2,130feet) |
| Mouth: | Otter Creek |
| Mouth Location: | Clarendon, Vermont |
| Mouth Coordinates: | 43.5063°N -72.9757°W |
| Mouth Elevation: | 540feet |
The Mill River is a 17.8adj=midNaNadj=mid[1] tributary of Otter Creek in Rutland County, Vermont, in the United States.
The Mill River rises in the southern part of the town of Mount Holly, west of the Okemo Mountain ski area in the Green Mountains. It flows northwest, paralleled by Vermont Route 155, to the village of East Wallingford, where it continues north and northwest paralleled by Vermont Route 103 and the Green Mountain Railroad. Just before entering the town of Clarendon it passes through Clarendon Gorge, where it is crossed by the Appalachian Trail. It turns west and then southwest at the village of East Clarendon, passes under U.S. Route 7, and reaches Otter Creek 1miles southwest of the village of Clarendon.