Dingxing County (simplified Chinese: 定兴县; traditional Chinese: 定興縣; pinyin: Dìngxīng Xiàn) is a county under the jurisdiction of the prefecture-level city of Baoding in central Hebei province, People's Republic of China.

It has an area of 714 km2 (276 sq mi) and 512,765 inhabitants (2020).

[1] It is served by China National Highway 107 and G4 Beijing–Hong Kong and Macau Expressway.

There are 5 towns and 11 townships under the county's administration.

[2] Towns: Townships: