| Aka River | |
| Name Other: | Akagawa |
| Name Etymology: | Red River |
| Subdivision Type1: | Country |
| Subdivision Name1: | Japan |
| Subdivision Type2: | State |
| Subdivision Name2: | Honshu |
| Subdivision Type3: | Region |
| Subdivision Name3: | Yamagata |
| Length Km: | 70 |
| Source1 Elevation: | 1771m (5,810feet) |
| Mouth: | Sea of Japan |
| Mouth Coordinates: | 38.8471°N 139.7841°W |
| Basin Size Km2: | 857 |
is a river in Yamagata Prefecture, Japan. It flows into the Sea of Japan.[1]
There are football fields on Akagawa riverbed in Tsuruoka, and they were NEC Yamagata SC's practice grounds.[2] [3]