Seo Eun-su () is a South Korean taekwondo practitioner. He won a gold medal at the 2025 World Taekwondo Championships.
In 2024, Seo competed at the 51st High School Federation President's Cup and was named the men's Outstanding Player Award winner with 101 points. He competed at the 2025 World Taekwondo Championships and won a gold medal in the 54 kg category, defeating Furkan Ubeyde ÃÂamoÃÂlu in the finals. He didn't drop a single round during his World Taekwondo Championships debut.