Wanxin Subdistrict () is a subdistrict located in the western part of Dongli District, Tianjin, China. It is situated to the south of Lushan Avenue and Huaming Subdistricts, west of Xinli Subdistrict and Tianjin Aviation Logistics District, north of Shuanggang Town and Liulin Subdistrict, as well as east of Dongxin and Shanghang Road Subdistricts. In addition, Wanxin has an exclave south of Erhaoqiao Subdistrict. Its population is 98,673 as of the year 2010.
The name Wanxin () is inherited from Wanxinzhuang Village that predated the subdistrict.
At the end of 2022, Wanxin Subdistrict is made up of 24 subdivisions, where 18 of them are residential communities and 6 of them are villages. They are listed as follows: