Kaset Sombun (Thai: เกษตรสมบูรณ์, pronounced [kā.sèːt sǒm.būːn]) is a district (amphoe) in the northern part of Chaiyaphum province, northeastern Thailand.

In 1917 the minor district's name was changed from Kaset Sombun to Ban Yang, the name of the central tambon.

[2] Neighbouring districts are (from the north clockwise) Khon San, Phu Khiao, Kaeng Khro, Mueang Chaiyaphum and Nong Bua Daeng.

[4] The district is divided into 11 subdistricts (tambons), which are further subdivided into 144 villages (mubans).

Geocode 11 belongs to Sap Si Thong, which was reassigned to Mueang Chaiyaphum District in 2003.