| West Branch Machias River | |
| Source1 Location: | Lower Sabao Lake |
| Mouth Location: | Machias River |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Length: | 10miles |
| Mouth Elevation: | 215feet |
The West Branch Machias River is a 10adj=midNaNadj=mid[1] tributary of the Machias River in Maine. The river starts from Sabao Dam (44.9869°N -67.9921°W) on the Lower Pond of Lower Sabao Lake.