Tangdong Subdistrict is a subdistrict located in Hunan Province, China. It serves as the administrative seat of Zixing City and is situated within an area of 153.87 km2 (59.41 sq mi). The seat of the subdistrict is located at Wenfenglu Community.
The subdistrict was established in 1989. In 2015, it underwent a territorial expansion by merging with the former Chengshui Town. As of current records, Tangdong has a population of approximately 81,100 residents.