Rudong County (simplified Chinese: 如东县; traditional Chinese: 如東縣; pinyin: Rúdōng Xiàn) is under the administration of Nantong, Jiangsu province, China, and lies on the Yellow Sea coast.

[2] The 14 towns are Juegang, Matang, Fengli, Caobu, Chahe, Shuangdian, Xindian, Hekou, Yuanzhuang, Changsha, Ju, Yangkou, Bencha and Dayu.

[citation needed] The county has many extraneous people from the south of the Yangtse River (Changjiang River), so there are two main dialects: Rudonghua which is a branch of Jianghuai Mandarin and Shadihua (Wu: Sodiwo [so di ɯo]), which is a branch of the Wu language.

As a result, there is a sizable fishing industry and the county was named "the place of seafood in China" by the Chinese Cooking Association in 2007.

Yankou Harbor was launched in May 2011 and includes a facility for unloading liquified natural gas.