| Birth Date: | 1993 8, df=yes |
| Height: | 178 cm |
| Weight: | 85 kg |
| Ru Position: | Wing |
| Years1: | 2016–2018 |
| Clubs1: | Toshiba Brave Lupus |
| Apps1: | 17 |
| Points1: | 45 |
| Years2: | 2018– |
| Apps2: | 16 |
| Points2: | 55 |
| Superyears1: | 2018 |
| Super1: | Sunwolves |
| Superapps1: | 1 |
| Superpoints1: | 5 |
| Repyears1: | 2013 |
| Repteam1: | Japan U20 |
| Repcaps1: | 4 |
| Reppoints1: | 35 |
Kai Ishii (born 4 August 1993) is a Japanese rugby union player for the Sunwolves in Super Rugby. He plays on the wing.
He scored a try on debut for the Sunwolves in their 41–31 loss to the Brumbies.[1] [2]