Xu Jiayu
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Xu Jiayu (Chinese: 徐嘉余; born 19 August 1995) is a Chinese competitive swimmer who specializes in the backstroke.

Xu was born in Wenzhou, Zhejiang. His mother Yu Zhenzhen (余珍珍) is a former swimmer who specialized in the butterfly. He has an elder sister Xu Si (徐思).

Xu started swimming at the age of 4 under his mother's guidance.

Xu is an alumnus of Shanghai Jiao Tong University.

Xu competed for China at the 2012 Summer Olympics, and won a silver medal in the 100 metre backstroke at the 2016 Summer Olympics. He is the current national record holder in backstroke races in all distances (50, 100, and 200 metres).

At the 2014 Asian Games, Xu, Ning Zetao, Li Zhuhao and Li Xiang teamed up to win the men's 4 × 100 metre medley relay.

At the 2016 short course World Championships, Xu won the bronze medal in the 100 metre backstroke.

At the 2018 Asian Games, Xu won the gold medals for Men's 50M and 200M Backstroke.