List of Nippon Professional Baseball players (O)

The following is a list of Nippon Professional Baseball players with the last name starting with O, retired or active.

O

 * Thomas O'Malley
 * Shota Oba
 * Takao Obana
 * Sherman Obando
 * Koji Obata
 * Wes Obermueller
 * Keiji Obiki
 * Wirfin Obispo
 * Daisuke Ochi
 * Eiji Ochiai
 * Hiromitsu Ochiai
 * Alex Ochoa
 * Kohei Oda
 * Tomoyuki Oda
 * Masakuni Odajima
 * Michihiro Ogasawara
 * Takashi Ogasawara
 * Koichi Ogata
 * Koichi Ogata
 * Yoshinori Ogata
 * Hirofumi Ogawa
 * Hiroshi Ogawa (pitcher)
 * Hiroshi Ogawa (shortstop)
 * Hiroshi Ogawa (second baseman)
 * Koichi Ogawa
 * Masatoshi Ogawa
 * Yoshiharu Ogawa
 * Yusuke Ogawa
 * Tadahiro Ogino
 * Ben Oglivie
 * Hisashi Ogura
 * Shinsuke Ogura
 * Sadaharu Oh
 * Heishu Ohara
 * Masanori Ohashi
 * Toyokazu Ohba
 * Yasufumi Ohgai
 * Akira Ohgi
 * Seiichi Ohira
 * Shoji Ohiro
 * Daijiro Ohishi
 * Masayoshi Ohishi
 * Tomokazu Ohka
 * Motoi Ohkoshi
 * Hideaki Ohkubo
 * Hiromoto Ohkubo
 * Masanobu Ohkubo
 * Kevin Ohme
 * Noriyoshi Ohmichi
 * Yuta Ohmine
 * Takeshi Ohmori
 * Iwao Ohmura
 * Naoyuki Ohmura
 * Saburo Ohmura
 * Hiroaki Ohnishi
 * Masaki Ohnishi
 * Takayuki Ohnishi
 * Hisashi Ohno
 * Kazuya Ohno
 * Rin Ohno
 * Ryuji Ohno
 * Takahiro Ohno
 * Yuji Ohno
 * Yutaka Ohno
 * Ryosuke Ohnuki
 * Koji Ohnuma
 * Hiromi Oho
 * Yutaro Ohsaki
 * Keiji Ohsawa
 * Hiroyuki Oshima
 * Takayuki Oshima
 * Yasunori Ohshima
 * Yutaka Ohshima
 * Yuji Ohshiro
 * Hiroshi Ohshita
 * Makoto Ohsuga
 * Atori Ohta
 * Atsushi Ohta
 * Satoru Ohta
 * Takashi Ohta
 * Ryuta Ohtahara
 * Kan Ohtake
 * Ryuji Ohtani
 * Susumu Ohtomo
 * Kenji Ohtonari
 * Akinori Ohtsuka
 * Akira Ohtsuka
 * Jun Ohtsuka
 * Koji Ohtsuka
 * Yoshiki Ohtsuka
 * Koji Ohwaki
 * Akihiko Ohya
 * Takahiro Ohyama
 * Alvis Ojeda
 * Yoichi Okabayashi
 * Akinobu Okada
 * Hirokazu Okada
 * Takahiro Okada
 * Kazunori Okagami
 * Hideki Okajima
 * Akira Okamoto
 * Atsushi Okamoto
 * Hidehiro Okamoto
 * Isami Okamoto
 * Katsunori Okamoto
 * Koji Okamoto
 * Naoya Okamoto
 * Shinya Okamoto
 * Tetsuji Okamoto
 * Toru Okamoto
 * Kaoru Okazaki
 * Taichi Okazaki
 * Yoshinori Okihara
 * Takehiro Okumura
 * Curtis Olsen
 * Shoitsu Omatsu
 * Yuji Onizaki
 * Goh Ono
 * Hitoshi Ono
 * Kazuyoshi Ono
 * Kazuyuki Ono
 * Kosei Ono
 * Shingo Ono
 * Chikara Onodera
 * Hirokatsu Oohata
 * Rafael Orellano
 * Junya Orita
 * José Ortiz
 * Luis Ortiz
 * Ramón Ortiz
 * Shuichiro Osada
 * Katsuhito Osaka
 * Takehiko Oshimoto
 * Kenichi Oshio
 * Koichi Oshima
 * Shigeki Oto
 * Chris Oxspring
 * Kouya Oyafuso
 * Keiji Oyama
 * Tsutomu Oyama
 * Takao Oyamada
 * Yasuhiro Oyamada
 * Masaya Ozaki
 * Hiroyuki Oze
 * Tatsuya Ozeki