| Niantic River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Connecticut |
| Subdivision Type3: | Counties |
| Subdivision Name3: | New London |
| Source1: | Banning Cove |
| Source1 Location: | East Lyme, New London County, Connecticut, United States |
| Source1 Coordinates: | 41.6608°N -72.1103°W |
| Mouth: | Long Island Sound |
| Mouth Location: | East Lyme, New London County, Connecticut, United States |
| Mouth Coordinates: | 41.5394°N -72.3033°W |
The Niantic River is a mainly tidal river in eastern Connecticut. It is crossed by the Niantic River Bridge carrying Amtrak's Northeast Corridor. It separates the towns of East Lyme and Waterford. The river is long.[1] The distance from the end of Banning Cove to the Niantic River Bridge is approximately 3.4 miles.