Hiromi Oka (岡 大海, Oka Hiromi, born July 15, 1991) is a Japanese professional baseball outfielder for the Chiba Lotte Marines of Nippon Professional Baseball (NPB). Oka is known as person that he has the same name as heroine of Aim for the Ace!, Japanese animation. Oka is outfielder but he had worn No. 18, it is known as uniform number that great pitcher wear in Japanese professional baseball, from 2017 to 2018.

• Career statistics from Baseball Reference (Minors)
• NPB.com