O
- Tsutae Obara
- Kiichi (Ki-ichi) Oda
- Noritsura Odaka
- Yojiro Ofusa
- Koichi Ogata
- Naoyuki Ogata
- Makoto Ogawa
- Nobuo Ogiya (ja:荻谷信男)
- Mitsuo Ogura
- Ryoji Ohara
- Hideo Oishi
- Yoshio Oishi
- Kenji Okabe
- Takashi Okamoto
- Juzo Okamoto
- Hiroshi Okano
- Yoshio Oki
- Misao Okubu
- Takeo Okumura (奥村武雄)
- Shokichi Omori
- Shigetaka Ōmori
- Hiroshi Onazaki
- Akira Onozaki
- Megumu Ono
- Satoru Ono
- Takeyoshi Ono
- Takashi Oshibuchi
- Toshio Ota (Devil of Rabaul) (太田敏夫)
- Kyushiro Otake
- Nakakazu Ozaki (ja:尾崎中和)
- Yukiharu Ozeki
Read more about this topic: List Of World War II Aces From Japan