Cheng Long (Chinese: 程龙; born 25 May 2000) is a Chinese swimmer.

[1] He competed in the men's 800 metre freestyle at the 2020 Summer Olympics.

[2] At the 2018 Junior Pan Pacific Swimming Championships, in Suva, Fiji, Long won the gold medal in the 1500 metre freestyle with a time of 15:24.55 and the silver medal in the 800 metre freestyle with a time of 8:02.79.

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