The Sarysu (Kazakh: Сарысу, Sarysu; Russian: Сарысу́, Sarysu) is a river in Karaganda, Ulytau, Turkistan, and Kyzylorda Regions of Kazakhstan. It is 671 kilometres (417 mi) long, and has a drainage basin of 81,600 square kilometres (31,500 sq mi).

The name sary su means yellow water in Turkic languages.

It arises above Zhanaarka and flows generally westward towards Kzyl-Dzhar where it turns south-westward past Birlestik and Zhanabas, then heading ever-more southerly it ends in the Telikol, across a cluster of small intermittent lakes at the western end of the Ashchykol Depression and to the east of the Dariyaly plain. River Boktykaryn runs parallel to it just before the Sarysu bends west towards the Telikol.

The main tributaries of the Sarysu are the Zhaman Sarysu, Zhaksy Sarysu, Surtisu, Atasu, Taldymanaka and Karakengir.

The 181 kilometers (112 mi) long Shieli-Telikol Canal was built for irrigation, connecting the Telikol lacustrine basin to the north with the Syr Darya river near Shieli.

• List of rivers of Kazakhstan

• Allen, W. E. D. (1956) "The Sources for G. Delisle's "Carte des Pays Voisins de la Mer Caspiene" of 1723" Imago Mundi 13: pp. 137–150, p. 139

• Media related to Sarysu River at Wikimedia Commons