Le'an River (Chinese: 乐安江; pinyin: Lè'ān Jiāng), also known as Daxishui (大溪水; Dàxīshuǐ), is a tributary of the Po River in Wuyuan County, Jiangxi, China.

It is 279 kilometres (173 mi) long and drains an area of 8,456 square kilometres (3,265 sq mi).

The river rises in Mount Wulong (五龙山) just northeastern Wuyuan County, and flows generally north through Dexing, Leping, and Wannian County to Yaogong Ferry (姚公渡) in Poyang County, where it flows into the Rao River.

Its main tributaries are Fanxi Stream (番溪水), Anyin Stream (安殷河), Chaxi Stream (槎溪河) and Jianjie Stream (建节水).

Le'an River is one of the five longest rivers in Jiangxi.