Koutouba is a township of Wen County in Gansu Province, China. It is located within Wen County's administrative jurisdiction in the southern part of Gansu, a province in north-central China.
The township was formerly known as Changnan township. Changnan was created by merging two earlier townships, Dujia and Changbei, into a single administrative unit. The name Koutouba replaced the earlier Changnan designation.
As a township-level administrative division, Koutouba forms part of the local government structure beneath Wen County. Further details about its area, population, and geography are not recorded in the available source material.