| Ryosei Kobayashi | |
| Residence: | Kanagawa, Japan |
| Birth Date: | 28 June 1994 |
| Birth Place: | Yokohama, Japan |
| Turnedpro: | 2010 |
| Retired: | Active |
| Racquet: | Head |
| Event: | Men's singles |
| Highest Ranking: | No. 63 |
| Date Of Highest Ranking: | September 2021 |
| Updated: | September 2021 |
is a professional squash player who represents Japan. He reached a career-high world ranking of World No. 63 in September 2021.[1] [2]