| Sawyer River | |
| Pushpin Map: | New Hampshire#USA |
| Pushpin Map Size: | 250 px |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New Hampshire |
| Subdivision Type3: | Counties |
| Subdivision Name3: | Grafton, Carroll |
| Subdivision Type4: | Towns |
| Subdivision Name4: | Livermore, Harts Location |
| Length: | 9.1miles |
| Source1: | Hancock Notch |
| Source1 Location: | Sandwich |
| Source1 Coordinates: | 44.0547°N -71.4864°W |
| Source1 Elevation: | 2680feet |
| Mouth: | Saco River |
| Mouth Location: | Harts Location |
| Mouth Coordinates: | 44.0861°N -71.3461°W |
| Mouth Elevation: | 827feet |
The Sawyer River is a 9.1adj=midNaNadj=mid[1] river in the White Mountains of New Hampshire in the United States. It is a tributary of the Saco River, which flows to the Atlantic Ocean in Maine.
The Sawyer River rises in the unincorporated township of Livermore, New Hampshire, on the eastern side of Hancock Notch, a pass in the Pemigewasset Wilderness between Mount Hancock to the north and Mount Huntington to the south. The river flows east, paralleled by the Hancock Notch Trail, into a broad valley with Mount Carrigain to the north and the smaller summit known as Greens Cliff to the south.
The river turns northeast, with Carrigain Brook joining from the north and the outlet of Sawyer Pond joining from the south, and enters a deeper, narrower mountain valley as it descends to Crawford Notch. The river is paralleled in this lower section by the Sawyer River Road, a gravel Forest Service access road open to the public May–October. The Sawyer River enters the town of Hart's Location and ends at the Saco River near its great bend to the east as it leaves Crawford Notch.