Firth River
General data
- Name: Firth River
- Water system: Arctic ocean
- Water type: River
- Progression: Beaufort sea -> Arctic ocean -> Planet Earth
- Climates: Subpolar
- Continents: North America
- Countries: Canada
Firth River is a major river in Yukon, Canada. It begins at the east side of Davidson Mountains and flows into the Beaufort Sea of the Arctic Ocean, just south of Herschel Island.