Jeongan or Ding'an (Chinese: 定安國; Korean: 정안국; 938–986) was a successor state of Balhae (Bohai) founded by Yeol Man-hwa (Lie Wanhua).

[1] Jeongan is recorded to have enlisted the assistance of neighboring tribes with the hopes of overthrowing the Liao dynasty, but apparently failed to do so.

[1] The official Chinese historical record, the History of Song claimed that Jeongan people's origin can be traced back to the former confederacy of Mahan.

However, the Mahan confederacy in the distant south of the Korean peninsula had disappeared for almost a millennium by the 10th century, and many scholars consider this record, written in the Yuan dynasty, to be an error.

[1] Oh Hyeon-myeong himself, on the other hand, stated that his people were Balhae remnants that lived the former land of Goguryeo.