Yu Cheng-yu (Chinese: 尤承宇; pinyin: Yóu Chéngyǔ; Taiwanese Mandarin: [jǒʊ tsʰə̌ŋ.ỳ]; born 2 April 1995) is a Taiwanese tennis player.

Yu has a career high ATP singles ranking of 531 achieved on 14 August 2017.

He also has a career high ATP doubles ranking of 671 achieved on 17 April 2017.

Yu represents Chinese Taipei at the Davis Cup, where he has a W/L record of 0–1.

This biographical article relating to Taiwanese tennis is a stub.