| Shotaro Onishi | |
| Fullname: | Shotaro Onishi |
| Birth Date: | 1978 11, df=yes |
| Birth Place: | Osaka Prefecture, Japan |
| Height: | 1.8m (05.9feet) |
| Weight: | 80kg (180lb) |
| Position: | Centre |
| Years1: | 2010–2013 |
| Clubs1: | Kintetsu Liners |
| Apps1: | 38 |
| Points1: | 127 |
| Years2: | 2013–2016 |
| Clubs2: | Toyota Industries Shuttles |
| Apps2: | 27 |
| Points2: | 145 |
| Repyears1: | 2000–2008 |
| Repcaps1: | 33 |
| Reppoints1: | 71 |
| Clubupdate: | 6 May 2021 |
| Repupdate: | 6 May 2021 |
is a former Japanese rugby union player who played as a centre. He spent his whole career playing for both Kintetsu Liners and Toyota Industries Shuttles in Japan's domestic Top League, playing over 560 times.[1] He was named in the Japan squad for the 2007 Rugby World Cup, making 3 appearances in the tournament.[2] He made a further 30 appearances for Japan in his career, scoring 71 points.[3]