| Tyosha | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia |
| Length: | 311km (193miles) |
| Mouth: | Oka |
| Mouth Coordinates: | 55.6342°N 42.1475°W |
| Basin Size: | 7800km2 |
The Tyosha (Russian: Тёша) is a river in Nizhny Novgorod Oblast in Russia, a right tributary of the Oka.[1] The length of the river is . The area of its basin is .[2] The Tyosha freezes up in November - first half of December and stays icebound until the second half of March - first half of April. Its biggest tributary is the Seryozha. The city of Arzamas is located on the Tyosha.