The Kiso River (木曽川 Kiso-gawa) is a river in Japan roughly 229 km long, flowing through the prefectures of Nagano, Gifu, Aichi, and Mie before emptying into Ise Bay a short distance away from the city of Nagoya. It is the main river of the Kiso Three Rivers (along with Ibi and Nagara rivers) and forms a major part of the Nōbi Plain. The valley around the upper portion of the river forms the Kiso Valley.
Kiso River and bridge (Inuyamatoushukourain'oohashi)
seen from Mount Igi.
| ⁃ location||Mount Hachimori|
| ⁃ elevation||2,446 m (8,025 ft)|
|Length||229 km (142 mi)|
|Basin size||5,275 km2 (2,037 sq mi)|
| ⁃ average||169 m3/s (6,000 cu ft/s)|
|River system||Kiso River|
Parts of the Kiso River are sometimes referred to as the Japan Rhine because of its similarities to the Rhine in Europe.