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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O, Il-sang | SP | Youngstown Thunder | 21 | 07/03/2018 | Shihung | KOR | Left | Left | 5' 11" | 170 lbs | - |
| O'Connor, Tony | RP | Free Agent | 26 | 05/29/2013 | Vernon | USA | Right | Right | 5' 10" | 175 lbs | - |
| Oda, Shoin | RF | Medicine Hat Drillers | 24 | 07/06/2015 | Yokohama | JPN | Right | Right | 6' 1" | 190 lbs | - |
| Ogawa, Kohei | SS | Camden Consigliere | 25 | 01/04/2015 | Kamagaya | JPN | Right | Right | 6' 3" | 200 lbs | - |
| Ogg, Darren | RF | Free Agent | 25 | 12/05/2014 | Prescot | ENG | Switch | Right | 6' 2" | 200 lbs | - |
| Ohara, Yoshifumi | SP | Seoul Crushers | 32 | 05/26/2007 | Kawagoe | JPN | Right | Right | 5' 9" | 190 lbs | - |
| Ohayashi, Akira | RP | Toyohira Fubuki | 27 | 03/31/2013 | Daito | JPN | Left | Right | 6' 2" | 195 lbs | - |
| Ohayashi, Masujiro | SP | Toronto Phantoms | 24 | 12/02/2015 | Kainan | JPN | Right | Right | 6' 6" | 200 lbs | - |
| Ohayashi, Nobuhisa | SP | Ikari Warriors | 27 | 06/23/2012 | Kanazawa | JPN | Right | Right | 6' 5" | 200 lbs | - |
| Oike, Naofumi | SS | Santurce Castillos | 23 | 12/03/2016 | Osaka | JPN | Right | Right | 6' 1" | 190 lbs | - |
| Okada, Shojiro | LF | Quebec City Frenchies | 23 | 07/10/2016 | Sendai | JPN | Switch | Right | 6' 0" | 200 lbs | - |
| Okamoto, Harumi | LF | Youngstown Thunder | 22 | 12/17/2017 | Sakai | JPN | Right | Right | 6' 0" | 185 lbs | - |
| Okamoto, Taro | C | Hamilton Industrialists | 26 | 02/26/2014 | Ageo | JPN | Right | Right | 6' 1" | 200 lbs | $560,000 |
| Okamoto, Tsuneari | CF | Inverness Highlanders | 28 | 12/17/2011 | Yonago | JPN | Right | Right | 6' 2" | 205 lbs | - |
| Okamura, Kazunari | SP | Edmonton Mall Ratz | 21 | 11/29/2018 | Nagoya | JPN | Right | Right | 6' 9" | 200 lbs | - |
| Okubo, Shunen | SP | Medicine Hat Drillers | 22 | 09/17/2017 | Yatsushiro | JPN | Left | Left | 6' 4" | 195 lbs | - |
| Oliver, Víctor | SP | Inverness Highlanders | 27 | 05/28/2012 | Durham | USA | Right | Right | 5' 9" | 165 lbs | - |
| Olushegun, Kipchoge | RP | Free Agent | 29 | 07/22/2010 | Parys | RSA | Left | Right | 6' 2" | 200 lbs | - |
| Orozco, José | RP | Monterey Sea Lions | 25 | 11/19/2014 | Villa Canales | GUA | Switch | Right | 6' 4" | 200 lbs | - |
| Orozco, Sergio | SP | Omaha Insurers | 22 | 06/18/2017 | Puerto Plata | DOM | Right | Right | 6' 5" | 200 lbs | - |
| Orr, Don | LF | Free Agent | 28 | 11/01/2011 | Staten Island | USA | Right | Right | 6' 0" | 200 lbs | - |
| Ortíz, Cisco | RP | Hampton Airborne | 33 | 11/21/2006 | Santa Clara | CUB | Left | Left | 6' 4" | 200 lbs | - |
| Ortíz, Francisco | C | Rockville Reckoning | 22 | 11/24/2017 | Mao | DOM | Right | Right | 6' 3" | 205 lbs | - |
| Ortíz, Norberto | 2B | Youngstown Thunder | 22 | 03/07/2018 | Villa Bisonó | DOM | Right | Right | 5' 10" | 155 lbs | - |
| Osequedo, John | RP | Laval Islanders | 19 | 01/29/2021 | Humacao | PUR | Right | Right | 6' 2" | 180 lbs | - |
| Oshima, Okakura | LF | Liverpool Beatles | 24 | 06/27/2015 | Toyota | JPN | Right | Right | 6' 1" | 190 lbs | - |
| Osterhout, Marcel | SP | Seoul Crushers | 32 | 09/26/2007 | Schouwen-Duiveland | NED | Right | Right | 6' 5" | 200 lbs | - |
| Otero, Fernando | SP | Camden Consigliere | 27 | 06/01/2012 | Chigoré | PAN | Right | Right | 6' 4" | 200 lbs | - |
| Otsuka, Taizo | SP | Port-au-Prince Bokors | 22 | 11/11/2017 | Sapporo | JPN | Switch | Right | 5' 10" | 170 lbs | - |
| Ouwerkerk, Phil | CF | Toronto Phantoms | 24 | 09/11/2015 | Eibergen | NED | Switch | Right | 6' 6" | 200 lbs | - |
| Ozawa, Masanobu | RP | Delaware Diamonds | 21 | 11/05/2018 | Sayama | JPN | Right | Right | 6' 1" | 175 lbs | - |
