| Fresh 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: | Towns |
| Subdivision Name4: | Brentwood, Epping, Exeter, Newfields |
| Length: | 3.2miles |
| Source1 Location: | Brentwood |
| Source1 Coordinates: | 43.0194°N -71.0233°W |
| Source1 Elevation: | 110feet |
| Mouth: | Piscassic River |
| Mouth Location: | Newfields |
| Mouth Coordinates: | 43.0308°N -70.9753°W |
| Mouth Elevation: | 85feet |
| Tributaries Right: | Beech Hill Brook |
The Fresh River is a 3.2adj=midNaNadj=mid[1] stream in southeastern New Hampshire in the United States. It is a tributary of the Piscassic River, which flows into the Lamprey River and is part of the Great Bay and Piscataqua River watershed leading to the Atlantic Ocean.
Nearly the entire course of the river is through freshwater wetlands. The vertical drop of the stream over its three-mile length is less than 30feet. It rises on the border between the towns of Epping and Brentwood and flows east into the northern corner of Exeter. The river crosses into Newfields just before joining the Piscassic River at the Piscassic Ice Pond.