Mayu Kobayashi (; born 10 November 1996) is a Japanese sprinter specializing in the 400 metres. She was the 2021 Japanese Champion in the 400 m and represented Japan at the 2022 World Athletics Championships.
Career Kobayashi competed in the women's 4 × 400 m relay and mixed 4 × 400 m relays at the 2021 World Athletics Relays.
Kobayashi won the 400 m at the 2021 Japan Championships in 53.86.
Kobayashi competed in the mixed 4 × 400 m relays at the 2022 World Championships.
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