River Tier
General data
- Name: River Tier
- Water system: Rhone
- Water type: River
- Progression: River Guiers -> Rhone -> Mediterranean Sea -> Atlantic Ocean -> Planet Earth
- Climates: Temperate
- Continents: Europe
- Countries: France
The Tier, also spelled Tiers, Thiers, or Thiez, is a river located in France in the Savoie department in the Auvergne-Rhône-Alpes region.
A natural spillway of Lake Aiguebelette, the river is a tributary of the right bank of the Guiers River after crossing the Savoy Foreland.