Dahongmen Subdistrict () is a subdistrict on the east side of Fengtai District, Beijing, China. It borders Xiluoyuan Subdistrict to the north, Xiaohongmen Township to the east, Nanyuan Township to the south, Majiabao Subdistrict to the west, and contains exclaves of Nanyuan Township within. The result of the 2020 Census determined the population to be at 177,946.
This subdistrict's name () referred to a former gate of Imperial Garden that once existed in this region during the Ming and Qing dynasty.
In 2023, Dahongmen has direct jurisdiction over 21 subdivisions, of which 19 are communities and 2 are villages: