Ozero Tatysh, lake in Russia

Ozero Tatysh is a lake in the Ilishevsky District of Bashkortostan, on the left bank of the Belaya River near the village of Starotatyshevo. It covers 0.38 km², stretches about 4 km long and 60 to 360 m wide, and reaches 7 m deep. Its shores are overgrown with cattail, broadleaf cattail and arrowhead, while yellow water-lily and pondweed grow in the water.

The area around the lake has been used by people for centuries and served as a place for small gatherings and hunting. Today it remains a protected site within Russia's system of natural monuments.

The lake lies on the left bank of the Belaya, by the village of Starotatyshevo and Stary Tatysh station. It freezes in the first days of November and thaws only in late April, staying ice-covered about six months. In late spring the water rises roughly 2 m, and in dry spells it drops by up to 1 m.

The lake's name comes from the Bashkir anthroponym Tatysh, a personal name, not a landscape term. The lake lies beside the old settlement of Starotatyshevo and the Stary Tatysh station, on the left bank of the Belaya. Its water level rises about 2 m in late spring and can drop by a metre in dry spells.