Seo Chang-wan (born 14 March 1997) is a South Korean modern pentathlete.
Career He won a bronze medal in the relay at the 2023 World Modern Pentathlon Championships in Bath, England.
In April 2024, he won the UIPM World Cup in Ankara. He won a silver medal at the 2024 World Modern Pentathlon Championships in the team event, and also won a gold medal in the relay. He competed at the 2024 Summer Olympics in Paris.
In August 2026, he won the bronze medal in the individual competition, and a gold medal in the mixed relay alongside Seong Seung-min, at the 2026 World Modern Pentathlon Championships in China.
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