Dingnan (Chinese: 定南; pinyin: Dìngnán) is a county under the jurisdiction of the prefecture-level city of Ganzhou, in the far south of Jiangxi province, China, bordering Guangdong province to the south.

As of the 2020 Chinese census, the population of Dingnan was 209,914.

The county executive, legislature, judiciary are at Lishi Town (历市镇), together with the CPC and PSB branches.

Presently, Dingnan County has 7 towns.

This Jiangxi location article is a stub.