The Xiaowan Dam (simplified Chinese: 小湾坝; traditional Chinese: 小灣壩; pinyin: Xiǎowān Bà) is an arch dam on the Lancang (Mekong) River in Nanjian County, Yunnan Province in southwest China.

It is also third highest among dams of all types behind Jinping-I and Nurek and the third largest hydroelectric power station in China.

[8] The creation of the dam's reservoir submerged 55,678 ha (137,583 acres) of land and displaced 32,737 people.

[1] Helping to control floods, the dam has two spillways, 5 gates near the crest and a tunnel on the left bank.

All of the dam's outlets including the power station give it a maximum flood discharge of 20,709 m3/s (731,331 cu ft/s).