| Ryuhei Oishi | |
| Fullname: | Ryuhei Oishi |
| Birth Date: | 21 January 1997 |
| Birth Place: | Shizuoka, Japan |
| Height: | 169 cm |
| Position: | Forward |
| Currentclub: | Blaublitz Akita |
| Clubnumber: | 14 |
| Youthclubs1: | Kokushikan University |
| Years1: | 2019-2023 |
| Caps1: | 115 |
| Goals1: | 14 |
| Clubs1: | Zweigen Kanazawa |
| Club-Update: | 3 July 2024 @ 09:43(AEST) |
| Nationalteam-Update: | 23 May 2019 |
| Years2: | 2024- |
| Clubs2: | Blaublitz Akita |
| Caps2: | 20 |
| Goals2: | 1 |
is a Japanese professional footballer who plays as a forward for Blaublitz Akita.[1]