Taishitun is a town in Miyun District, Beijing, China. It lies in the northeastern part of the district, bordered by Gaoling and Gubeikou Towns to the north, Xinchengzi and Wulingshan Towns to the east, Beizhuang and Dachengzi Towns to the southeast, and Jugezhuang and Mujiayu Towns to the southwest.
The town is notable as the point where three rivers—the Chao, Qingshui and Andamu—converge before flowing into the Miyun Reservoir, a major source of water for Beijing. This confluence gives Taishitun a role in the hydrology of the upper reservoir catchment.
According to the 2020 census, Taishitun had a population of 22,388.