Tangjiakou Subdistrict () is a subdistrict located on the western side of Hedong District, Tianjin. it borders Xiangyanglou and Shanghang Road Subdistricts to its east, Dazhigu and Dawangzhuang Subdistricts to its south, and Chunhua Subdistrict to its northwest. It had a total population of 72,845 as of 2010.
Its name can be translated as "Tang family's Gate".
By the end of 2021, Tangjiakou Subdistrict administered 12 communities. They are, by the order of their Administrative Division Codes: