| Deer 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: | County |
| Subdivision Name3: | Carroll |
| Subdivision Type4: | Town |
| Subdivision Name4: | Madison |
| Length: | 2.6miles |
| Source1: | Confluence of Ham Brook and Salter Brook |
| Source1 Location: | Madison |
| Source1 Coordinates: | 43.9083°N -71.1942°W |
| Source1 Elevation: | 610feet |
| Mouth: | Silver Lake |
| Mouth Location: | Madison |
| Mouth Coordinates: | 43.8839°N -71.1764°W |
| Mouth Elevation: | 468feet |
The Deer River is a 2.6adj=midNaNadj=mid[1] stream in eastern New Hampshire in the United States. It is a tributary of Silver Lake, part of the Ossipee Lake / Saco River watershed leading to the Atlantic Ocean.
The Deer River lies entirely within the town of Madison, New Hampshire. It begins at a wetland where Ham Brook and Salter Brook join, then flows south through woodlands to the village of Silver Lake, where it enters the north end of Silver Lake, the water body.