| Kōtarō Kiyomiya | |
| Team: | Hokkaido Nippon-Ham Fighters |
| Number: | 21 |
| Position: | infielder |
| Birth Date: | 25 May 1999 |
| Birth Place: | Tokyo, Japan |
| Bats: | Left |
| Throws: | Right |
| Debutleague: | NPB |
| Debutdate: | May 2 |
| Debutyear: | 2018 |
| Debutteam: | Hokkaido Nippon-Ham Fighters |
| Statyear: | 2023 season |
| Statleague: | NPB |
| Stat1label: | Batting average |
| Stat1value: | .216 |
| Stat2label: | Hits |
| Stat2value: | 302 |
| Stat3label: | Home runs |
| Stat3value: | 49 |
| Stat4label: | Runs batted in |
| Stat4value: | 169 |
| Stat5label: | Stolen bases |
| Stat5value: | 8 |
| Teams: |
|
| Highlights: | |
is a Japanese baseball player who currently plays for the Hokkaido Nippon-Ham Fighters of Nippon Professional Baseball's (NPB) Pacific League as a First Baseman. A left-handed batter and right-handed thrower, Kotaro stands 6inchesft0inchesin (ftin) tall and weighs 225lb. He was the first pick of the Fighters in the 2017 draft. He is the son of notable Japanese rugby union coach, Katsuyuki Kiyomiya.
Kiyomiya drew major news attention in the 2012 Little League World Series, where at the age of 13 he employed an 80 mph fastball (major league equivalent of throwing 104 MPH) to lead Team Japan to a 12–2 LLWS championship win over the team from Goodlettsville, Tennessee. He was also noted to have hit 60 home runs in 50 games[1] Kiyomiya then went to Waseda Jitsugyo High School where he set the Japanese high school baseball record for home runs with 111 home runs over three seasons in high school. On August 23, 2017, it was announced that he would serve as captain of Samurai Japan for the 2017 U-18 Baseball World Cup.
Seven teams chose Kotaro in the first round of the 2017 NPB draft, the Hokkaido Nippon-Ham Fighters won the right to negotiate with Kiyomiya by winning the lottery.[2] Kotaro then chose the jersey number 21.[3]
On February 27, 2019, he was selected for Japan national baseball team at the 2019 exhibition games against Mexico,[4] but on March 4, 2019, he canceled his participation due to broken right hamate bone.[5]