Vermilion River (Illinois tributary)
General data
- Name: Vermilion River (Illinois tributary)
- Water system: Mississippi River
- Water type: River
- Progression: Illinois River (Mississippi tributary) -> Mississippi River -> Gulf of Mexico -> Atlantic Ocean -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America
The Vermilion River is a 74.8-mile-long (120.4 km) tributary of the Illinois River in the state of Illinois, United States. The river flows north, in contrast to a second Vermilion River in Illinois, which flows south to the Wabash River. The Illinois and Wabash rivers each have a tributary named the Little Vermilion River as well.