Shandaksor (Kazakh: Шаңдақсор; Russian: Шандаксор) is a salt lake in the Ekibastuz City Administration, Pavlodar Region, Kazakhstan.

[1] Shandaksor is one of the main lakes in the area surrounding Ekibastuz and is part of the Irtysh Water Management Basin.

It was formed by filling an endorheic intermittent lake (sor) with water from the Irtysh–Karaganda Canal in order to cool the adjacent thermal power station.

The northern end of larger lake Karasor lies 8 kilometers (5.0 mi) to the east.

Smaller lake Zhyngyldy, with the Ekibastuz GRES-1 Power Station by its northern shore, lies 9 kilometers (5.6 mi) to the south of the southern lakeshore.