| Kosuke Horikoshi | |
| Birth Date: | 2 June 1995 |
| Birth Place: | Gunma, Japan |
| Height: | 1.750NaN0 |
| Weight: | 1000NaN0 |
| Position: | Hooker |
| Currentclub: | Tokyo Sungoliath |
| Years1: | 2018– |
| Clubs1: | Tokyo Sungoliath |
| Apps1: | 37 |
| Points1: | 40 |
| Repyears1: | 2014–2015 |
| Repteam1: | Japan U20 |
| Repcaps1: | 9 |
| Reppoints1: | 5 |
| Repyears2: | 2015–2023 |
| Repteam2: | Japan XV |
| Repcaps2: | 7 |
| Reppoints2: | 10 |
| Repyears3: | 2018– |
| Repteam3: | Japan |
| Repcaps3: | 8 |
| Reppoints3: | 5 |
| Clubupdate: | 28 August 2023 |
| Repupdate: | 28 August 2023 |
is a Japanese professional rugby union player who plays as a hooker for Japan Rugby League One club Tokyo Sungoliath and the Japan national team.[1]
Japan head coach Jamie Joseph has named Kosuke Horikoshi in a 52-man training squad ahead of British and Irish Lions test.[2]