| Boreas River | |
| Pushpin Map: | New York Adirondack Park#USA |
| Pushpin Map Caption: | Location of the mouth of the Boreas River |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New York |
| Subdivision Type3: | Region |
| Subdivision Type4: | Counties |
| Subdivision Type5: | Towns |
| Source1: | Boreas Ponds |
| Source1 Location: | NNE of Boreas River (hamlet) |
| Source1 Coordinates: | 44.0431°N -73.9057°W[1] |
| Source1 Elevation: | 1978feet[2] |
| Mouth: | Hudson River |
| Mouth Location: | SE of Forks Mountain |
| Mouth Coordinates: | 43.7976°N -74.0479°W |
| Mouth Elevation: | 1161feet |
Boreas River is a river in Essex County and Hamilton County in the U.S. State of New York. Boreas River begins at Boreas Ponds north-northeast of the Hamlet of Boreas River and flows southeastward before converging with the Hudson River southeast of Forks Mountain.