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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O, Il-sang | RP | Akron Ambers | 24 | 07/03/2018 | Shihung | KOR | Left | Left | 5' 11" | 180 lbs | - |
| O'Halloran, Dan | SP | Leeds Locomotives | 22 | 11/13/2019 | Jersey City | USA | Right | Right | 6' 4" | 190 lbs | $560,000 |
| O'Neal, Ray | LF | Kyoto Rodan | 22 | 03/08/2020 | Chicago | USA | Left | Right | 6' 2" | 195 lbs | $560,000 |
| Oglethorpe, Zach | LF | Free Agent | 34 | 01/05/2008 | New York | USA | Right | Right | 6' 3" | 200 lbs | - |
| Ohara, Yoshifumi | RP | Kyoto Rodan | 35 | 05/26/2007 | Kawagoe | JPN | Right | Right | 5' 9" | 190 lbs | $560,000 |
| Ohayashi, Masujiro | SP | Sioux Falls Lakota | 26 | 12/02/2015 | Kainan | JPN | Right | Right | 6' 6" | 205 lbs | - |
| Oike, Kazunari | CL | Kyoto Rodan | 22 | 03/11/2020 | Nagaizumi | JPN | Left | Left | 6' 0" | 185 lbs | - |
| Okamoto, Harumi | DH | Akron Ambers | 24 | 12/17/2017 | Sakai | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Ono, Ogai | SP | Thornton Sun Dogs | 33 | 09/30/2009 | Bungotakada | JPN | Right | Right | 6' 4" | 200 lbs | - |
| Onodera, Seiichi | DH | Yokohama Plumbers | 26 | 09/20/2016 | Ichikawa | JPN | Right | Right | 6' 2" | 200 lbs | $560,000 |
| Ooyendijk, Adri | SP | Glendale Skyelanders | 23 | 08/16/2019 | Arnhem | NED | Right | Right | 5' 10" | 170 lbs | - |
| Ortega, Raúl | RF | Kyoto Rodan | 39 | 03/05/2003 | Inverness | USA | Left | Left | 6' 2" | 205 lbs | - |
| Ortega, Roberto | C | Evansville Tri-Staters | 35 | 04/02/2007 | Colón | CUB | Right | Right | 6' 2" | 195 lbs | $7,000,000 |
| Ortíz, Bernardo | 2B | Free Agent | 25 | 06/01/2017 | Sancti Spíritus | CUB | Left | Right | 6' 4" | 200 lbs | - |
| Ortíz, Freddy | SS | Free Agent | 33 | 05/13/2009 | Samana | DOM | Right | Right | 6' 4" | 205 lbs | - |
| Osterhout, Marcel | SP | Beantown Browns | 35 | 09/26/2007 | Schouwen-Duiveland | NED | Right | Right | 6' 5" | 200 lbs | - |
| Otero, Leonardo | 2B | Free Agent | 27 | 04/23/2015 | Ecatepec | MEX | Right | Right | 6' 4" | 185 lbs | - |
| Otsuka, Toshimichi | RP | Fayetteville Braggarts | 24 | 05/31/2018 | Yokohama | JPN | Right | Right | 6' 2" | 190 lbs | - |
| Ouakili, Shadi | SP | Eindhoven Electric | 26 | 01/17/2016 | Soweto | RSA | Left | Right | 6' 2" | 180 lbs | - |
| Ouwerkerk, Phil | CF | Provo Missionaries | 27 | 09/11/2015 | Eibergen | NED | Switch | Right | 6' 6" | 205 lbs | $560,000 |
| Overgaag, Otte | RP | Lincoln Emancipation | 23 | 06/21/2019 | Vlaardingen | NED | Right | Right | 6' 3" | 200 lbs | - |
| Overgaag, Steve | 2B | Evansville Tri-Staters | 34 | 01/29/2008 | Leeuwarden | NED | Right | Right | 5' 10" | 185 lbs | - |
| Ow-Yang, Shi-ping | C | Beantown Browns | 29 | 04/07/2013 | Taipei | TPE | Left | Right | 6' 0" | 195 lbs | $13,000,000 |
| Oyama, Shimei | RP | Kyoto Rodan | 26 | 11/05/2015 | Minamata | JPN | Right | Right | 6' 6" | 200 lbs | $560,000 |
| Ozawa, Masanobu | SP | Fayetteville Braggarts | 23 | 11/05/2018 | Sayama | JPN | Right | Right | 6' 1" | 185 lbs | - |
