| Tokoro River | |
| Name Other: | 常呂川 |
| Subdivision Type1: | Country |
| Subdivision Name1: | Japan |
| Subdivision Type2: | State |
| Subdivision Name2: | Hokkaidō |
| Subdivision Type3: | Region |
| Subdivision Name3: | Abashiri |
| Subdivision Type4: | District |
| Subdivision Name4: | Kitami, Tokoro |
| Subdivision Type5: | Municipality |
| Subdivision Name5: | Oketo |
| Length: | 120km (80miles) |
| Discharge1 Avg: | 26.41m3/s |
| Source1: | Mount Mikuni |
| Source1 Location: | Oketo, Hokkaidō, Japan |
| Source1 Elevation: | 940m (3,080feet) |
| Mouth: | Sea of Okhotsk |
| Mouth Location: | Kitami, Hokkaidō, Japan |
| Mouth Elevation: | 0m (00feet) |
| Basin Size: | 1930km2 |
is a river in Hokkaidō, Japan.
The Tokoro River, which has its source in Mt. Mikuni (alt. 1,541 m), flows through Oketo and Kunneppu towns and into the Sea of Okhotsk from Kitami City.[1] Many white-tailed eagles and Steller’s sea eagles that have been designated as protected species by the national government are observed in its basin. A colony of purple azalea designated as a natural monument by the Hokkaido government and a forest of large-diameter Japanese elm trees along the Muka River, which flows parallel to the Tokoro River, are symbols of the region. At the Tokoro River Estuary Site, relics, remains of pit-dwellings and tomb pits from the Jomon era have been found.[2]