| Little Machias River | |
| Mouth Coordinates: | 46.6519°N -68.4219°W |
| Subdivision Type1: | Country |
| Progression: | Machias — Aroostook — St. John — |
The Little Machias River is a 17.7adj=midNaNadj=mid[1] river in Maine. From its source (46.7276°N -68.6267°W) in Maine Township 12, Range 7, WELS, it runs about 8miles east to Little Machias Lake and about 9miles southeast to its confluence with the Aroostook River in Ashland, downstream (north) of the confluence of the Machias River with the Aroostook. Via the Aroostook River, it is part of the Saint John River watershed.