Xinchengzi Town (simplified Chinese: 新城子镇; traditional Chinese: 新城子鎮; pinyin: Xīnchéngzi Zhèn) is a town located in the Miyun District of Beijing, China.

It borders Liangjianfang and Laowa Townships in the north, Wulingshan Town in the east and south, as well as Gubeikou and Taishitun Towns in the west.

Xinchengzi is situated foothill of Mount Wuling, which is part of the larger Yan Mountain Range.

[2] The town is connected to the Beijing-Chengde Expressway, as well as the city-level Songcao Road.

By 2021, Xinchengzi Town was composed of 19 subdivisions, where 1 was a community and 18 were villages.