| Position | Outfielder |
|---|---|
| Team | Chiba Lotte Marines |
| Number | 25 |
| Bats | Right |
| Throws | Right |
| Birth date | July 15, 1991 (age 35) |
| Birth place | Kurashiki, Okayama, Japan |
| Debutleague | NPB |
| Debutdate | March 28 |
| Debutyear | 2014 |
| Debutteam | Hokkaido Nippon-Ham Fighters |
| Statyear | July 21, 2024 |
| Statleague | NPB |
| Stat1label | Batting average |
| Stat1value | .244 |
| Stat2label | Home runs |
| Stat2value | 40 |
| Stat3label | Runs batted in |
| Stat3value | 179 |
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Hiromi Oka (岡 大海, Oka Hiromi) is a Japanese professional baseball outfielder for the Chiba Lotte Marines in the Nippon Professional Baseball (NPB) league.