Japanese World Cup alpine ski racer specializing in slalom, born 31 May 1998 in Kanazawa, Ishikawa Prefecture, resident in Hokkaido and racing for Benefit One SC. Won silver in giant slalom at the 2016 Youth Olympic Games and gold in giant slalom at the 2017 Asian Winter Games in Sapporo; started the slalom at the 2022 Beijing Olympics (DNF). His best World Cup result is 8th in the Madonna di Campiglio slalom in December 2021. Competes at World Cup, European Cup and Far East Cup level, with regular starts on the Far East Cup circuit in Japan and South Korea. Recorded top-10 Far East Cup slalom finishes at Alpensia Resort and Sugadairakohgen, and won FIS-level slalom races at Sugadairakohgen in the 2023-24 season. Competed at the 2025 World Championships in Saalbach (27th, slalom) and has continued racing World Cup slalom through the 2025-26 season, including starts at Levi, Gurgl, Val d'Isere and Alta Badia.

FIS Code 6300464. Occupation per FIS bio: Student. 2025 World Championships (Saalbach): 27th, slalom. Regular Far East Cup slalom competitor with multiple top-10 finishes in Japan and South Korea. FIS's official biography spells his name 'Yohei Koyama' (FIS Code 6300464, born 31 May 1998) - this is treated as the same athlete with a minor romanization variant, per FIS as the authoritative source.

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