Koi Sie Yan (born 8 February 1999) is a Malaysian rhythmic gymnast.

Koi also went onto compete at the 2015 Southeast Asian Games and claimed her maiden Southeast Asian Games medal after securing a gold medal in the women's individual all-around event.

[3][4][5] She was again selected to represented Malaysia at the 2022 Commonwealth Games,[6] ending in 4th in the team event and qualifying for the ribbon final with a score of 25.750.

[7] In December 2023, the Malaysian Gymnastics Federation announced plans to engage Koi and Izzah Amzan as assistant coaches to the national team.

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