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Du Chengyi, known professionally as A-du (阿杜; ), is a Singaporean singer.

Career
Du was a construction foreman before being spotted by Singaporean producer Billy Koh in his company's talent search and was signed to Ocean Butterflies Music. He released his debut album in 2002.

In 2012, Du left showbiz due to panic disorder. 

Du originally planned to release an album in 2015, but the album was delayed due to his mother's illness.

In 2018, Du returned to showbiz with a new album, ''I Will Not Hide. ''

In 2022, Du joined Singapore media company 8028 Holdings.

Personal life
Du married Lai Weili (賴瑋莉; ) in January 2016. They dated before Du became a singer for 7 years. They re-established their relationship when Du was diagnosed with panic disorder. They had a child in May 2016.

When Du returned to the media in 2018, he was criticized by fans for gaining weight.  Du, in interviews, clarified that his weight gain was caused by his medications for treating panic disorder. 

His nephew, Kenny Khoo, has also been a singer since 2014.