Dìng'ān (Chinese: 定安; pinyin: Dìng'ān; postal: Tingan) is an administrative district in Hainan, People's Republic of China.

It is one of 4 counties of Hainan.

The town of Dingcheng is the main population center.

Ding'an a tropical monsoon climate (Köppen Am).

This Hainan location article is a stub.