The Engilchek (Kyrgyz: Эңилчек) is a river in Ak-Suu District of Issyk-Kul Region of eastern Kyrgyzstan. It drains the Engilchek Glacier in the Central Tian Shan Mountains. It is a left tributary of the river Saryjaz (Aksu in China). It is 62 kilometres (39 mi) long, has a drainage basin of 1,739 square kilometres (671 sq mi), and its annual average flow rate is 30.0 m/s (1,060 cu ft/s). The only populated place on its banks is the mining village Engilchek, near its confluence with the Saryjaz.