| Official Name: | Kök-Janggak |
| Native Name: | Көк-Жаңгак |
| Pushpin Map: | Kyrgyzstan |
| Pushpin Label Position: | bottom |
| Pushpin Mapsize: | 300 |
| Pushpin Map Caption: | Location in Kyrgyzstan |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name: | Kyrgyzstan |
| Subdivision Name1: | Jalal-Abad Region |
| Subdivision Type2: | District |
| Subdivision Name2: | Suzak District |
| Established Title: | Established |
| Established Date: | 1943 |
| Area Footnotes: | [1] |
| Area Total Km2: | 12.13 |
| Population As Of: | 2021 |
| Population Total: | 12117 |
| Coordinates: | 41.0333°N 85°W |
| Elevation Max M: | 1450 |
| Elevation Min M: | 1200 |
Kök-Janggak (Kirghiz; Kyrgyz: Көк-жаңгак, meaning "blue walnut" in Kyrgyz and Uzbek, Russian: Кок-Янгак Kok-Yangak) 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. Its population was 12,117 in 2021. It is a city of regional significance within the Suzak District.[2]
Kök-Janggak originated as a coal-mining settlement in 1910. The upper strata of coal of the Kok-Yangak coal deposit were mined on a small scale until the October Revolution. 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. In 1943 Kök-Janggak became a town.[3]
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.