Yongding Town () is a town that the southeastern corner of Mentougou District, Beijing, China. It borders Longquan Town, Dayu and Guangning Subdistricts in the north, Gucheng Subdistrict in the east, Wangzuo Town and Beigong Town in the south, Tanzhesi Town in the west, and has an exclave north of Tanzhesi Town. It had 106,112 people living within its borders as of 2020.
The area was named Yongding () after the Yongding River that passes through it.
As of 2021, Yongding Area had direct jurisdiction over 51 subdivisions, of which 27 were communities and 24 were villages: