Teo Kok Siang (born 26 August 1990) is a Malaysian former badminton player who currently works as a doubles coach in the national team of his country.
Siang won the gold medals at the Asian and World Junior Championships in the boys' doubles partnered with Mak Hee Chun. In 2013, he reach the semi-final round at the Southeast Asian Games partnered with Goh V Shem but was defeated by the Indonesian pair, and they settled for bronze. In 2015, he submitted his resignation letters to the Badminton Association of Malaysia (BAM), and started to play as an independent player. He started coaching independent players; Goh Soon Huat and Shevon Jemie Lai in January 2023.
His elder brother Teo Kok Seng is also a world junior champion from 1998.
Teo Kok Siang got engaged with former badminton player Cheah Yee See in August 2025.
Men's doubles
Boys' doubles
Boys' doubles
Men's doubles