The Uly-Zhylanshyk (Kazakh: Ұлы Жыланшық; Russian: Улы-Жыланшык) is a river in Kazakhstan.

[1] It is one of the rivers of the Turgay Depression, flowing across the Amangeldi and Zhangeldi districts of the Kostanay Region, Kazakhstan.

The Uly-Zhylanshyk flows roughly westwards all along its course, sometimes bending northwest for a certain distance and others to the southwest.

As it reaches its last stretch the river meanders strongly.

Finally it flows into the northeastern shore of Lake Aqköl, an endorheic salt lake located in Zhangeldi District, north of Shalkarteniz.