Nanxi is a town in Puning, a county-level city in Guangdong province, China. It is one of the administrative divisions of Puning and lies in the eastern part of Guangdong, within the Chaoshan region.
As of 2020, Nanxi administered one residential neighborhood, Nanxi Residential Neighborhood, along with 40 villages. These villages include Nanxi Village, Yangmei, Xiaweiwang, Xiaweizhang, Dianguo, Dianzhan, Yihu, Yujiao, Dongyang, Chaowei, Jinjiao, Dengfeng, Laodou, Xindou, Xinxing, Linshangshu, Yuzhugang, Pingdingqiao, Sanfu, Yushantou, Pingxue, Pingsu, Zhongtang, Baoya, Xinfang, Laofang, Xinxi, Dalong, Shilin, Jiaxing, Landou, Dong First, Dong Second, Qianzhai, Houzhai, Shishang, Chenpan, Guopan, Beixi, and Xinqiao.
The town's administrative structure reflects the typical township-level organization found in rural Guangdong, combining a small central residential area with a large number of surrounding agricultural villages.