Zhaksybay (Kazakh: Жақсыбай is a lake in Nauyrzym District, Kostanay Region, Kazakhstan.

[3] Zhaksybay is an endorheic lake located in the southern sector of the Turgay Plateau between the sources of the Ulkayak and the Tobol rivers.

Small lake Batpakkol lies 2.5 kilometers (1.6 mi) to the east of the southeastern shore and is connected to it by a channel.

[2][1] Zhaksybay has a roughly oval shape, with an inlet in the north, and a maximum length of approximately 5 kilometers (3.1 mi).

[4] The lake basin is surrounded by steppe vegetation and is used for grazing local cattle.