Niantic River
General data
- Name: Niantic River
- Water system: Atlantic Ocean
- Water type: Estuary
- Progression: Long Island Sound -> Atlantic Ocean -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America
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 5.2 miles (8.4 km) long. The distance from the end of Banning Cove to the Niantic River Bridge is approximately 3.4 miles.