Xavier Ong (Chinese: 王勝宇 / 王胜宇; pinyin: Wang Sheng Yu, born 20 April 1994) is a Singaporean actor.

He attended Outram Secondary School but did not manage to graduate due to the widely controversial incident in 2010 while he was taking the national 'O' Level examinations.

After achieving mild success with his early work, Ong was enlisted into the army and he wasn't allowed to further appear in television or film for the period of his service.

In late 2012, Ong signed on to work with influencer marketing agency Gushcloud International where he started getting engaged in social media campaigns.

In 2015, after Ong finished serving the nation, he left Gushcloud and ventured into the Taiwan entertainment scene where he made frequent appearances on variety shows but returned to Singapore in late 2015.