| Old 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: | Rockingham |
| Subdivision Type4: | Town |
| Subdivision Name4: | Hampton |
| Length: | 3.1miles |
| Source1 Location: | Hampton |
| Source1 Coordinates: | 42.9506°N -70.8361°W |
| Source1 Elevation: | 70feet |
| Mouth: | Taylor River |
| Mouth Location: | Hampton |
| Mouth Coordinates: | 42.9472°N -70.8781°W |
| Mouth Elevation: | 10feet |
The Old River is a 3.1adj=midNaNadj=mid[1] stream located in southeastern New Hampshire in the United States. It is a tributary of the Taylor River, the primary tributary of the Hampton River estuary connected to the Atlantic Ocean.
The river's entire course is within Hampton, New Hampshire. It rises north of the center of town, in a wetland, and flows west, past the Interstate 95/NH 101 interchange at the Hampton tollbooths. The river continues southwest, passing through Car Barn Pond, and reaches the Taylor River upstream from Coffins Mill.