Liu Ou (Chinese: 刘鸥, born 13 November 1986) is a Chinese synchronized swimmer.

Liu competed in the women's team event at the 2008 Summer Olympics where she won a bronze medal.

She followed up this success in the women's duet and women's team events at the 2012 Summer Olympics where she won a bronze (with Huang Xuechen) and silver medal respectively.

[1] After her retirement in 2013, Liu Ou went to the United States to coach the Santa Clara Aquamaids.

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