Koksu District (Kazakh: Көксу ауданы, Köksu audany) is a district of Jetisu Region in Kazakhstan. The administrative center of the district is the settlement of Balpyk Bi. It is named after the largest river in the area: Koksu River. Population: 39,617 (2013 estimate); 38,417 (2009 Census results); 40,105 (1999 Census results).