List of Nippon Professional Baseball players (O)
# 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.

## List of Nippon Professional Baseball players

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z

## 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
