| Koki Yamamoto | |
| Birth Date: | 29 October 1990 |
| Birth Place: | Shiga, Japan |
| Height: | 1.81m (05.94feet) |
| Weight: | 116kg (256lb) |
| School: | Yahata Technical High School |
| University: | Kinki University |
| Position: | Prop |
| Currentclub: | Kobelco Kobe Steelers |
| Years1: | 2013–2021 |
| Clubs1: | Yamaha Júbilo |
| Apps1: | 105 |
| Points1: | 15 |
| Years2: | 2016–2017 |
| Apps2: | 15 |
| Points2: | 0 |
| Years3: | 2021- |
| Clubs3: | Kobelco Kobe Steelers |
| Repyears1: | 2016– |
| Repcaps1: | 7 |
| Reppoints1: | 0 |
| Clubupdate: | 21 February 2021 |
| Repupdate: | 21 February 2021 |
is a Japanese rugby union player who plays as a prop.[1]
In his home country he plays for Yamaha Júbilo whom he joined in 2013.[2] [3] He was also named in the first ever squad which will compete in Super Rugby from the 2016 season.[4]