| Kotona Hayashi | |
| Fullname: | Kotona Hayashi |
| Nationality: | Japanese |
| Birth Date: | 13 November 1999 |
| Height: | 1.73m (05.68feet) |
| Weight: | 62kg (137lb) |
| Spike: | 292 cm |
| Block: | 280 cm |
| Position: | Wing spiker |
| Currentclub: |  JT Marvelous |
| Currentnumber: | 15 (national) 2 (club) |
| Years1: | 2015 |
| Team1: | U-19 national team |
| Years2: | 2018 |
| Team2: | U-21 national team |
| Years3: | 2020–present |
| Team3: | Senior national team |
| Nationalyears: | 2020–present |
is a Japanese volleyball player. She plays for the Japan women's national volleyball team.[1] She competed at the 2020 Summer Olympics, in Women's volleyball.[2]
She participated in the 2015 FIVB Volleyball Girls' U18 World Championship, 2018 Asian Women's Volleyball Cup[3] and 2021 FIVB Volleyball Women's Nations League.[4]
She plays for JT Marvelous, who placed first in the 2019–20 V.League Division 1 Women's.