Ong Yew Sin (born 30 January 1995) is a Malaysian badminton player.

Together with Teo Ee Yi, they won the 2016 Bitburger Open and earned a silver and a bronze medal at the 2017 and 2019 SEA Games respectively.

[3] In January 2020, they were dropped from the national team by the Badminton Association of Malaysia.

Their best achievement was winning the men's doubles silver medal at the 2023 Badminton Asia Championships after narrowly losing to Satwiksairaj Rankireddy and Chirag Shetty with a score of 21–16, 17–21, 19–21 in 66 minutes.

They won a men's doubles bronze medal at the 2021 BWF World Championships, where they had to go through a narrow fight against Olympic champions Lee Yang and Wang Chi-lin in the quarterfinals.