| Yasachnaya Ясачная | |
| Pushpin Map: | Russia Sakha Republic |
| Pushpin Map Caption: | Mouth location in Yakutia, Russia |
| Mouth: | Kolyma |
| Mouth Coordinates: | 65.7314°N 150.9108°W |
| Subdivision Type1: | Country |
| Length: | 490km (300miles) |
| Basin Size: | 35900km2 |
The Yasachnaya (Russian: Ясачная; Yakut: Дьаһаак, Cahaak) is a river in the Russian Far East. It rises in the Chersky Range and meets the Kolyma near the settlement of Zyryanka. It is long, and has a drainage basin of . Its main tributaries are Omulyovka, Olguya, Rassokha and Gonyucha, all from the West.