Jiangkou is a county in China under the administration of Tongren, a prefecture-level city in the northeast of Guizhou Province. Its county government is seated in Shuangjiang. The name Jiangkou is also shared by a town in Zhejiang, but the administrative unit described here is the Guizhou county.
Located in northeastern Guizhou, Jiangkou lies within a mountainous province of southwestern China. The county's administrative centre at Shuangjiang serves as the seat of its local government. As a county, it forms part of the tier of local administration below Tongren, which oversees it.
Jiangkou is one of several counties that make up Tongren's jurisdiction in this part of Guizhou. The county's position in the province's northeast places it within a region of Guizhou bordering other parts of the province and neighbouring areas. Its government functions are based in Shuangjiang, the town that hosts the county authorities.