The Kalkutan (Kazakh: Қалқұтан / Qalqūtan) or Koluton (Russian: Колутон) is a river of the Akmola Region, Kazakhstan.

It has its sources in lake Shortankol, by Novorybinka village.

It joins the right bank of the Ishim a little to the north of Kalkutan railway station.

Its main tributaries are the 68 km (42 mi) long Talkara, the 171 km (106 mi) long Boksyk, the 48 km (30 mi) long Ashchysai, and the 174 km (108 mi) long Arshaly from the right.

[2] This article related to a river in Kazakhstan is a stub.