Nissitissit River

General data
- Name: Nissitissit River
- Water system: Merrimack River
- Water type: River
- Progression: Nashua River -> Merrimack River -> Gulf of Maine -> Atlantic Ocean -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America
Description
The Nissitissit River is a 10.5-mile-long (16.9 km) river in southern New Hampshire and northern Massachusetts in the United States. It is a tributary of the Nashua River, itself a tributary of the Merrimack River, which flows to the Gulf of Maine. This river is part of the Nashua River Watershed.