Koki Yamamoto
| Date of birth | 29 October 1990 | ||||||||||||||||||||||||||||||||||||||||||||
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| Place of birth | Shiga, Japan | ||||||||||||||||||||||||||||||||||||||||||||
| Height | 1.81 m (5 ft 11 in) | ||||||||||||||||||||||||||||||||||||||||||||
| Weight | 116 kg (18 st 4 lb; 256 lb) | ||||||||||||||||||||||||||||||||||||||||||||
| School | Yahata Technical High School | ||||||||||||||||||||||||||||||||||||||||||||
| University | Kinki University | ||||||||||||||||||||||||||||||||||||||||||||
| Rugby union career | |||||||||||||||||||||||||||||||||||||||||||||
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Koki Yamamoto (山本 幸輝, Yamamoto Kōki; born 29 October 1990 in Shiga Prefecture) is a Japanese rugby union player who plays as a prop.
In his home country he plays for Yamaha Júbilo whom he joined in 2013. He was also named in the first ever Sunwolves squad which will compete in Super Rugby from the 2016 season.