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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Day, Ronald | SP | Utrecht Scholars | 22 | 08/25/2017 | San Juan | PUR | Switch | Right | 6' 7" | 200 lbs | - |
| O'Keefe, Willie | RP | Nampa Moccasins | 20 | 07/23/2019 | Vancouver | CAN | Switch | Right | 6' 2" | 185 lbs | - |
| O'Neal, Keith | RF | Fort Wayne Pioneers | 22 | 07/07/2017 | Agana Heights | GUM | Right | Right | 6' 2" | 205 lbs | - |
| O'Quinn, Willie | 1B | Rapid City Rushmores | 24 | 11/18/2015 | Waukesha | USA | Left | Right | 6' 6" | 220 lbs | - |
| Ogawa, Anzai | LF | San Luis Rio Colorado Rapidos Blancos | 24 | 10/08/2015 | Tokyo | JPN | Left | Left | 6' 3" | 200 lbs | - |
| Oglethorpe, Michael | LF | Nampa Moccasins | 23 | 08/16/2016 | Altoona | USA | Right | Right | 6' 2" | 195 lbs | - |
| Oishi, Sugita | RP | Chula Vista Chargers | 22 | 03/11/2018 | Matsuyama | JPN | Right | Right | 6' 5" | 195 lbs | - |
| Okada, Hogai | 1B | Nagano Olympians | 19 | 11/18/2020 | Inagi | JPN | Left | Left | 6' 2" | 200 lbs | - |
| Okamoto, Shotaro | CF | Middle Bass Vintners | 19 | 08/01/2020 | Fukuoka | JPN | Right | Right | 6' 1" | 170 lbs | - |
| Okubo, Sekien | 2B | Takaoka Shiko | 24 | 03/18/2016 | Hiratsuka | JPN | Right | Right | 6' 0" | 185 lbs | - |
| Olaires, Paterno | RF | Salton Sea Kilmers | 22 | 04/19/2018 | Manila | PHI | Left | Left | 6' 2" | 195 lbs | - |
| Olivo, Marcos | SP | Rosarito Monjas del Vuelo | 23 | 10/04/2016 | León | NCA | Right | Right | 6' 6" | 195 lbs | - |
| Oly, Carsten | 1B | Free Agent | 25 | 10/14/2014 | Nijmegen | NED | Right | Right | 6' 2" | 200 lbs | - |
| Ong, Ai-de | 1B | Portsmouth Dockhands | 22 | 07/29/2017 | Shanghai | CHN | Right | Right | 6' 5" | 200 lbs | - |
| Ong, Hyun-il | RP | Bismarck Battleships | 23 | 12/27/2016 | Seoul | KOR | Right | Right | 6' 8" | 200 lbs | - |
| Ono, Namboku | RP | Tijuana Saguaros | 20 | 02/07/2020 | Tokyo | JPN | Right | Left | 6' 1" | 160 lbs | - |
| Onodera, Nariaki | SP | Hoboken Crooners | 24 | 02/27/2016 | Yokohama | JPN | Right | Left | 6' 4" | 195 lbs | - |
| Opie, Adam | RP | Rapid City Rushmores | 24 | 12/26/2015 | Lossiemouth | SCO | Right | Right | 6' 1" | 175 lbs | - |
| Ordóñez, Pancho | RP | Rapid City Rushmores | 22 | 07/23/2017 | San Felipe | CRC | Right | Right | 6' 4" | 190 lbs | - |
| Orozco, Juan Carlos | 3B | Bismarck Battleships | 22 | 08/31/2017 | Tualatin | USA | Left | Right | 6' 3" | 185 lbs | - |
| Ortega, Miguel | DH | National City Bankers | 23 | 02/28/2017 | Cienfuegos | CUB | Left | Left | 6' 6" | 200 lbs | - |
| Ortega, Raúl | CF | Calexico Reins | 24 | 10/16/2015 | Santo Domingo | DOM | Left | Left | 6' 2" | 190 lbs | - |
| Ortíz, Esteban | RP | Nampa Moccasins | 23 | 03/26/2017 | Managua | NCA | Left | Right | 6' 2" | 185 lbs | - |
| Ortíz, Miguel | SP | Drumright Tornadoes | 24 | 09/20/2015 | Villa Altagracia | DOM | Right | Left | 6' 4" | 205 lbs | - |
| Ortíz, Octávio | SP | San Luis Rio Colorado Rapidos Blancos | 22 | 05/30/2017 | Santo Domingo | DOM | Right | Right | 6' 0" | 170 lbs | - |
| Ortíz, Pablo | 3B | Free Agent | 26 | 01/01/2014 | Constanza | DOM | Left | Right | 6' 4" | 200 lbs | - |
| Osborne, Ian | 3B | Nampa Moccasins | 22 | 09/11/2017 | Brisbane | AUS | Right | Right | 6' 0" | 185 lbs | - |
| Otsuka, Toshimichi | RP | Ensenada Las Brujas Malvadas | 21 | 05/31/2018 | Yokohama | JPN | Right | Right | 6' 2" | 185 lbs | - |
