| Kazuya Onohara | |
| Fullname: | Kazuya Onohara |
| Birth Date: | 16 April 1996 |
| Birth Place: | Hirakata, Osaka, Japan |
| Height: | 172 cm |
| Position: | Defender |
| Currentclub: | Blaublitz Akita (on loan from Zweigen Kanazawa) |
| Clubnumber: | 80 |
| Youthclubs1: | Ryutsu Keizai University |
| Years1: | 2019–2020 |
| Caps1: | 13 |
| Goals1: | 0 |
| Clubs1: | Renofa Yamaguchi |
| Years2: | 2020–2021 |
| Caps2: | 23 |
| Goals2: | 2 |
| Clubs2: | Oliveirense |
| Years3: | 2022– |
| Caps3: | 65 |
| Goals3: | 2 |
| Clubs3: | Zweigen Kanazawa |
| Years4: | 2024– |
| Caps4: | 3 |
| Goals4: | 1 |
| Clubs4: | →Blaublitz Akita (loan) |
| Club-Update: | 9 March 2024 |
| Nationalteam-Update: | 27 May 2019 |
is a Japanese professional footballer who plays as a defender for Blaublitz Akita on loan from Zweigen Kanazawa.