Tyosha River is a right tributary of the Oka, flowing through the Nizhny Novgorod Region.
It is fed by snowmelt, begins to freeze in November, and breaks up in late March.
Located along the river are the Towns of Nizhny Novgorod Region towns of Arzamas and Lukoyanov, the urban-type settlement of Gremyachevo, and the settlement of Shatki. The urban-type settlement of Tyosha is situated 8 km from the river.