| Agi River | |
| Source1 Location: | Mount Yaki |
| Mouth Location: | Kiso River |
| Subdivision Type1: | Country |
| Subdivision Name1: | Japan |
| Length: | 16.9km (10.5miles) |
| Source1 Elevation: | 1709m (5,607feet) |
| River System: | Kiso River |
The is a river in Japan which flows through Gifu Prefecture. It is part of the Kiso River system.
The river originates from Mount Yaki on the border of Nakatsugawa and Ena and flows west. It flows through the Akigawa Dam and the Ōi Dam before emptying into the Kiso River.
Ōi-juku, a post town on the historical Nakasendō, was on the banks of the Agi River.[1]
The Agi river flows through the cities of Ena and Nakatsugawa in Gifu Prefecture.