Zhamantuz (Kazakh: Жамантұз) is a salt lake in the Aktogay District, Pavlodar Region, Kazakhstan.

[1] The lake lies 20 kilometers (12 mi) to the east of Barlybai village.

[1] Zhamantuz has a roughly hourglass shape, with a smaller northern part connected to the southern through a narrow sound.

The lake freezes in late November and stays under ice until the second half of March.

72 kilometers (45 mi) to the SSW lies larger lake Zhalauly.