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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O, Keon | 3B | Free Agent | 19 | 04/25/2023 | Pusan | KOR | Right | Right | 6' 0" | 175 lbs | - |
| O, Sung-hoon | CF | Charleston Statesmen | 24 | 10/29/2017 | Pusan | KOR | Left | Right | 5' 11" | 170 lbs | $560,000 |
| O'Brien, Chris | 2B | Free Agent | 20 | 03/03/2022 | Queens | USA | Right | Right | 6' 3" | 180 lbs | - |
| O'Neil, William | SP | Free Agent | 23 | 05/05/2019 | Omaha | USA | Right | Right | 6' 6" | 205 lbs | - |
| O'Quane, Tom | RF | London Underground | 26 | 05/03/2016 | Dublin | IRL | Right | Right | 6' 6" | 200 lbs | $560,000 |
| O'Slattery, Timothy | RP | Arlington Bureaucrats | 26 | 02/09/2016 | Sacramento | USA | Right | Right | 6' 4" | 200 lbs | $750,000 |
| O'Toole, Alan | LF | Scottish Claymores | 27 | 07/04/2015 | Millsboro | USA | Right | Right | 6' 4" | 200 lbs | $560,000 |
| Obanjoko, Sifaks | CF | Kentucky Thoroughbreds | 16 | 06/02/2026 | Masunga | BOT | Right | Right | 6' 0" | 165 lbs | - |
| Ocasio, Carlos | 3B | Palm Springs Codgers | 26 | 06/28/2016 | Santo Domingo | DOM | Right | Right | 6' 3" | 205 lbs | $560,000 |
| Ocasio, Héctor | SP | Florida Farstriders | 16 | 03/11/2026 | Santo Domingo | DOM | Right | Right | 6' 1" | 170 lbs | - |
| Ogawa, Eichiro | CL | New Jersey Hitmen | 31 | 09/09/2011 | Nabari | JPN | Right | Right | 6' 2" | 200 lbs | $560,000 |
| Oglethorpe, Paul | RF | Free Agent | 36 | 09/06/2006 | New York | USA | Right | Right | 6' 2" | 205 lbs | - |
| Ogwambi, Massin | 2B | Tempe Apollos | 18 | 07/30/2024 | Alberton | RSA | Right | Right | 6' 2" | 180 lbs | - |
| Ohayashi, Ichiro | C | Free Agent | 23 | 06/26/2019 | Ishinomaki | JPN | Right | Right | 6' 3" | 200 lbs | - |
| Ohayashi, Ikku | RP | London Underground | 27 | 10/10/2015 | Kobe | JPN | Right | Right | 6' 5" | 200 lbs | $750,000 |
| Ohayashi, Shoin | 2B | London Underground | 23 | 07/24/2019 | Yokohama | JPN | Right | Right | 6' 5" | 195 lbs | $560,000 |
| Ohayashi, Toshimichi | SP | Aurora Borealis | 23 | 05/08/2019 | Kochi | JPN | Right | Right | 6' 2" | 190 lbs | $560,000 |
| Ohon, Uksem | SP | Reno Zephyrs | 17 | 07/05/2025 | Nkowakowa | RSA | Right | Right | 6' 3" | 190 lbs | - |
| Ojeda, José | SP | Reno Zephyrs | 28 | 07/20/2014 | Salama | GUA | Left | Right | 6' 3" | 200 lbs | $26,000,000 |
| Ojima, Kazunori | 3B | Free Agent | 25 | 10/14/2017 | Otsuchi | JPN | Left | Right | 6' 4" | 200 lbs | - |
| Okada, Misao | RP | Florida Farstriders | 26 | 03/19/2016 | Nishinasuno | JPN | Left | Right | 6' 8" | 205 lbs | $560,000 |
| Okada, Yoshinobu | RP | New Orleans Trendsetters | 28 | 01/18/2014 | Tochigi | JPN | Left | Left | 6' 4" | 185 lbs | $560,000 |
| Okazaki, Yorikane | SP | Free Agent | 22 | 02/24/2020 | Suita | JPN | Left | Right | 6' 7" | 190 lbs | - |
| Olaguibel, Armando | RP | Duluth Warriors | 26 | 03/11/2016 | Santiago | CHI | Right | Left | 6' 4" | 200 lbs | $1,500,000 |
| Olatunji, Shadi | RP | Toyama Wind Dancers | 18 | 03/12/2024 | Tarkwa | GHA | Right | Right | 6' 5" | 195 lbs | $560,000 |
| Olazaba, Joaquín | CF | San Antonio Calzones of Laredo | 18 | 10/13/2024 | Managua | NCA | Right | Right | 6' 0" | 170 lbs | - |
| Olivos, Juan | SP | Gloucester Fishermen | 17 | 11/07/2024 | Las Guaranas | DOM | Right | Right | 6' 2" | 180 lbs | - |
| Olvera, Félix | 3B | Toyama Wind Dancers | 18 | 06/15/2024 | Santo Domingo | DOM | Left | Right | 6' 1" | 180 lbs | $560,000 |
| On, Tong-yeop | RP | Free Agent | 17 | 07/22/2025 | Pusan | KOR | Right | Right | 6' 2" | 170 lbs | - |
| Onyebuchi, Kokaji | 1B | Kalamazoo Badgers | 17 | 02/05/2025 | Tema | GHA | Right | Right | 6' 1" | 170 lbs | - |
| Oolbekkink, Koos | SP | Free Agent | 21 | 07/16/2021 | Willemstad | ANT | Right | Right | 6' 4" | 190 lbs | - |
| Oprel, Iwan | 1B | Havana Leones | 18 | 04/09/2024 | Oostpunt | ANT | Left | Left | 6' 2" | 215 lbs | - |
| Oracio, Rodrigo | RP | Fargo Dinosaurs | 27 | 01/25/2015 | Huehuetenango | GUA | Right | Right | 6' 8" | 200 lbs | $1,150,000 |
| Ordaz, Guido | CF | London Underground | 17 | 10/11/2025 | Caraguatatuba | BRA | Left | Left | 6' 1" | 165 lbs | - |
| Ordoño, Jesús | RP | Free Agent | 20 | 07/30/2022 | Bogota | COL | Right | Right | 6' 6" | 200 lbs | - |
| Ordóñez, Luis | SP | New Jersey Hitmen | 18 | 09/24/2024 | Delgado | SLV | Left | Left | 6' 1" | 175 lbs | - |
| Ornelas, Alfredo | SS | Tempe Apollos | 18 | 03/03/2024 | San Francisco de Macorís | DOM | Right | Right | 6' 4" | 185 lbs | - |
| Ornelza, Juan Carlos | LF | Neo-Tokyo Akira | 35 | 01/29/2007 | Mexico City | MEX | Left | Left | 5' 11" | 200 lbs | $24,000,000 |
| Orocumojica, Pablo | RF | Manchester Maulers | 31 | 05/30/2011 | San Miguelito | PAN | Left | Left | 6' 3" | 200 lbs | $13,800,000 |
| Orosco, António | C | Arlington Bureaucrats | 20 | 09/30/2022 | Managua | NCA | Switch | Right | 6' 2" | 200 lbs | - |
| Orozco, Alfonso | C | London Underground | 17 | 07/18/2025 | Pedro Brand | DOM | Right | Right | 6' 3" | 205 lbs | - |
| Orozco, Rafael | SP | Yuma Arroyos | 17 | 10/02/2025 | Managua | NCA | Left | Left | 6' 3" | 180 lbs | - |
| Orozco, Sergio | SP | Manchester Maulers | 25 | 06/18/2017 | Puerto Plata | DOM | Right | Right | 6' 5" | 200 lbs | $560,000 |
| Ortega, Javier | SP | Amsterdam Lions | 16 | 03/27/2026 | Santa Clara | CUB | Right | Right | 6' 3" | 185 lbs | - |
| Ortega, Júlio | RP | Free Agent | 23 | 11/23/2018 | Tampa | USA | Left | Left | 6' 4" | 200 lbs | - |
| Ortega, Leonardo | C | Gloucester Fishermen | 32 | 03/22/2010 | Aguada de Pasajeros | CUB | Right | Right | 6' 1" | 200 lbs | $19,000,000 |
| Ortega, Pedro | SP | Shin Seiki Evas | 16 | 02/16/2026 | Celaya | MEX | Right | Right | 6' 5" | 190 lbs | - |
| Ortega, Rubén | 2B | Crystal Lake Sandgnats | 32 | 05/25/2010 | Quebradillas | PUR | Right | Right | 5' 10" | 180 lbs | $2,600,000 |
| Ortíz, Alberto | SS | Crystal Lake Sandgnats | 19 | 04/24/2023 | Guadalupe | CRC | Left | Right | 6' 2" | 180 lbs | - |
| Ortíz, Alfredo | CF | San Juan Coqui | 18 | 09/11/2024 | Zamora | MEX | Left | Right | 6' 3" | 200 lbs | - |
| Ortíz, Alfredo | C | Free Agent | 20 | 11/24/2021 | Almolonga | GUA | Left | Right | 6' 2" | 205 lbs | - |
| Ortíz, Armando | SP | Shin Seiki Evas | 18 | 10/08/2024 | Ocotlan | MEX | Right | Right | 6' 8" | 205 lbs | - |
| Ortíz, César | LF | Kalamazoo Badgers | 17 | 05/19/2025 | Managua | NCA | Right | Right | 6' 0" | 170 lbs | - |
| Ortíz, Gustavo | RP | Gloucester Fishermen | 16 | 11/05/2025 | Pespire | HON | Right | Right | 6' 1" | 175 lbs | - |
| Ortíz, Jesús | 3B | Neo-Tokyo Akira | 30 | 06/18/2012 | Santo Domingo | DOM | Right | Right | 6' 4" | 200 lbs | $1,700,000 |
| Ortíz, José | CF | Free Agent | 24 | 09/10/2018 | Chinandega | NCA | Right | Right | 6' 0" | 195 lbs | - |
| Ortíz, José | SP | San Juan Coqui | 18 | 06/19/2024 | Bogota | COL | Left | Right | 5' 10" | 160 lbs | - |
| Ortíz, José | SP | Free Agent | 30 | 12/23/2011 | El Tigre | VEN | Right | Right | 6' 0" | 175 lbs | - |
| Ortíz, José | RP | Free Agent | 18 | 08/05/2024 | Desamparados | CRC | Right | Right | 6' 0" | 165 lbs | - |
| Ortíz, Luis | SP | Palm Springs Codgers | 17 | 05/19/2025 | San Francisco de Macorís | DOM | Right | Right | 6' 4" | 185 lbs | - |
| Ortíz, Pablo | 1B | Reno Zephyrs | 36 | 08/08/2006 | Santo Domingo | DOM | Right | Right | 6' 5" | 195 lbs | $34,499,999 |
| Ortíz, Pancho | CF | Free Agent | 17 | 05/18/2025 | Banes | CUB | Left | Left | 6' 2" | 180 lbs | - |
| Ortíz, Roberto | C | Free Agent | 31 | 09/27/2011 | Santo Domingo | CUB | Right | Right | 6' 4" | 200 lbs | - |
| Ortíz, Salvador | SP | London Underground | 17 | 04/26/2025 | Medellín | COL | Left | Left | 6' 6" | 190 lbs | - |
| Ortíz, Ángel | SP | Yuma Arroyos | 19 | 01/31/2023 | Tijuana | MEX | Switch | Right | 5' 11" | 175 lbs | - |
| Osman, Kasper | SS | Toyama Wind Dancers | 23 | 01/02/2019 | Geertruidenberg | NED | Left | Right | 6' 0" | 185 lbs | $560,000 |
| Osmond, Zak | CF | London Underground | 26 | 03/20/2016 | Huntingdon | ENG | Left | Left | 6' 2" | 195 lbs | $13,000,000 |
| Osorio, Raúl | 3B | Kentucky Thoroughbreds | 19 | 09/27/2023 | Higüey | DOM | Switch | Right | 6' 2" | 190 lbs | - |
| Otani, Nori | C | Free Agent | 21 | 04/27/2021 | Funabashi | JPN | Right | Right | 6' 2" | 200 lbs | - |
| Otani, Yosai | RF | Shin Seiki Evas | 30 | 09/15/2012 | Toyota | JPN | Right | Right | 6' 1" | 200 lbs | $3,000,000 |
| Otero, Jesús | 2B | Kentucky Thoroughbreds | 18 | 07/13/2024 | La Romana | DOM | Right | Right | 6' 2" | 175 lbs | - |
| Otero, Roberto | RP | Kalamazoo Badgers | 18 | 08/19/2024 | Guadalupe | CRC | Right | Right | 6' 6" | 195 lbs | - |
| Othiambo, Ghidewon | 3B | Toyama Wind Dancers | 18 | 08/21/2024 | Kroonstad | RSA | Right | Right | 6' 3" | 190 lbs | - |
| Otsuka, Taizo | SP | Havana Leones | 24 | 11/11/2017 | Sapporo | JPN | Switch | Right | 5' 10" | 180 lbs | $560,000 |
| Ouaziz, Ato | SP | Amsterdam Lions | 17 | 03/11/2025 | Vryburg | RSA | Left | Left | 6' 6" | 195 lbs | - |
| Oulton, Joseph | LF | Niihama-shi Ghosts | 22 | 07/05/2020 | Hamilton | CAN | Left | Right | 6' 0" | 185 lbs | $560,000 |
| Ouma, Amduka | SP | Gloucester Fishermen | 17 | 11/02/2024 | Nairobi | KEN | Left | Left | 6' 3" | 190 lbs | - |
| Ow, Chiah-jen | 2B | Fargo Dinosaurs | 18 | 10/10/2024 | Anyang | CHN | Switch | Right | 6' 1" | 175 lbs | - |
| Owen, Jeffery | RP | Reno Zephyrs | 28 | 04/15/2014 | Columbia | USA | Right | Right | 6' 1" | 200 lbs | $1,100,000 |
| Ozaki, Horiuchi | 2B | Free Agent | 22 | 01/22/2020 | Suita | JPN | Right | Right | 5' 11" | 180 lbs | - |
| Ozaki, Nori | LF | Havana Leones | 31 | 12/09/2010 | Mitsuke | JPN | Right | Right | 6' 5" | 205 lbs | $7,800,000 |
