Gallatin River

General data
- Name: Gallatin River
- Water system: Missouri River
- Water type: River
- Progression: Missouri River -> Mississippi River -> Gulf of Mexico -> Atlantic Ocean -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America
Description
The Gallatin River is a tributary of the Missouri River, approximately 120 mi (193 km) long, in the U.S. states of Wyoming and Montana. It is one of three rivers, along with the Jefferson and Madison, that converge near Three Forks, Montana, to form the Missouri.