Pennichuck Brook

General data
- Name: Pennichuck Brook
- Water system: Merrimack River
- Water type: River
- Progression: Merrimack River -> Gulf of Maine -> Atlantic Ocean -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America
Description
Pennichuck Brook is one of the tributaries of the Merrimack River in New Hampshire in the United States. Its watershed is 31 square miles (80 km2) and is one of the 14 subwatersheds of the Merrimack River. It passes through Nashua and Merrimack, New Hampshire and serves as the public water supply for greater Nashua.