Kök-Janggak (Kyrgyz: Көк-жаңгак, meaning "blue walnut" in Kyrgyz and Uzbek, Russian: Кок-Янгак Kok-Yangak)[3] is a city in Jalal-Abad Region in western Kyrgyzstan, located at a distance of about 29 km from the regional centre city Jalal-Abad.

[2] It is a city of regional significance within the Suzak District.

During the Civil War in Russia the mine was destroyed by basmachi and extraction was suspended.

During the first five-year plan new drift mines were developed and an access railroad from Jalal-Abad was built in 1931, resulting in a rapid increase in coal production.

[3][5] The population of Kök-Janggak was 10,341 in 2004; including 8,400 - Kyrgyz, 640 - Uzbek, 540 - Russian, 210 - Tatar, 140 - Kazakh, and 411 - other nationalities.