Naoki Koyama (born 12 May 1996) [1] is a Japanese marathon runner. Koyoma set a course record of 2:07:40 at the 2023 Gold Coast Marathon in Australia [2] and qualified for the 2024 Summer Olympics by winning the Marathon Grand Championships in Japan. [3] [4] At the Olympics, Koyama placed 23rd in the men's marathon. [5] He was present at the opening of the Museum of World Athletics Heritage Athletics exhibition at the Tokyo Metropolitan Government Building in July 2025. [6]