Da'anshan Township () is a township located inside of Fangshan District, Beijing, China. It borders Zhaitang Town and Datai Subdistrict to its north, Fozizhuang Township to its southeast, and Shijiaying Township to its southwest. Its total population was 2,871 in the 2020 census.
The name Da'anshan () originated in the late Tang dynasty, when warlord Liu Rengong constructed Da'an Emporium around this region.
In 2021, Da'anshan Township comprised one residential community and eight villages: