Chengzi Subdistrict () is a subdistrict that stands on eastern Mentougou District, Beijing, China. It borders Longquan Town in the north and west, Wulituo Subdistrict in the east, Dayu and Dongxinfang Subdistricts in the south. In the year 2020, its population was 44,644.
As of 2021, Chengzi Subdistrict was formed from 20 communities: