The Zhylandysay (Kazakh: Жыландысай) is a river in Shalkar District, Aktobe Region, Kazakhstan.

[1] The Zhylandysay has its sources in the Shagyray Plateau, part of the southern sector of the Mugalzhar Hills, to the southwest of lake Shalkar.

In its final stretch it bends southwestwards and then again eastwards, entering lake Berdensor from the west.

The western edge of the Greater Barsuki desert lies close to the east of its end.

The Zhylandysay usually reaches its highest level in the spring season when the snows melt.