| Osha | |
| Mouth: | Irtysh |
| Mouth Coordinates: | 57.2117°N 73.6703°W |
| Length: | 530km (330miles) |
| Basin Size: | 21300km2 |
| Pushpin Map: | Russia Omsk Oblast |
| Pushpin Map Caption: | Mouth location in Omsk Oblast |
The Osha (Russian: Оша) is a river in Omsk Oblast, Russia, a left tributary of the Irtysh.[1] It is long, and has a drainage basin of . The river flows across lake Tenis.[2]