| Browns 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: | Seabrook, Hampton Falls |
| Length: | 2.9miles |
| Source1 Location: | Seabrook |
| Source1 Coordinates: | 42.8969°N -70.8686°W |
| Source1 Elevation: | 40feet |
| Mouth: | Hampton Harbor |
| Mouth Location: | Seabrook, Hampton Falls |
| Mouth Coordinates: | 42.8956°N -70.8353°W |
| Mouth Elevation: | 0feet |
| Tributaries Left: | Swains Creek |
| Tributaries Right: | Hunts Island Creek |
The Browns River is a 2.9adj=midNaNadj=mid river, primarily tidal, in southeastern New Hampshire in the United States. It is part of the largest salt marsh in New Hampshire, covering over 3800acres.[1]
The river rises in the town of Seabrook just east of U.S. Route 1 and quickly enters the salt marsh and tidewater. For most of its length, the river forms the boundary between Seabrook and Hampton Falls. The river runs along the north side of Seabrook Station Nuclear Power Plant, then ends in Hampton Harbor, where it joins the Hampton River.