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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Neil, Dave | SP | Seattle Rocketeers | 25 | 06/02/2016 | Canton | USA | Right | Left | 6' 1" | 195 lbs | $280,000 |
| Ohayashi, Koryusai | CF | Brooklyn Dodgers | 22 | 04/26/2019 | Tomakomai | JPN | Switch | Right | 6' 4" | 195 lbs | $280,000 |
| Oliver, David | RP | Free Agent | 19 | 01/13/2022 | El Paso | USA | Right | Right | 6' 5" | 195 lbs | - |
| Oliwa, Ainanani | RP | Vancouver Grey Wolves | 29 | 01/23/2012 | Nuuuli | ASA | Right | Right | 5' 10" | 180 lbs | $280,000 |
| Om, Jae-keol | SS | Mississippi Mockingbirds | 18 | 11/11/2023 | Pohang | KOR | Right | Right | 6' 1" | 180 lbs | - |
| Oreta, Juan | SS | Long Island Lighthouse | 16 | 05/10/2025 | Davao | PHI | Right | Right | 6' 4" | 180 lbs | - |
| Oropeza, Luis | RP | Pittsburgh Kingfishers | 32 | 04/03/2009 | Santa Ana | SLV | Left | Left | 6' 1" | 190 lbs | $420,000 |
| Orosco, Félix | C | Cleveland Browns | 18 | 02/04/2023 | San Miguel | CRC | Right | Right | 5' 9" | 170 lbs | - |
| Ortíz, Pedro | 3B | Seattle Rocketeers | 17 | 10/05/2024 | San Antonio | CRC | Left | Right | 6' 2" | 180 lbs | - |
| Oskamp, Pim | SS | Montana Pandas | 18 | 09/02/2023 | Willemstad | CUR | Right | Right | 6' 1" | 165 lbs | - |
| Ota, Yakamochi | 3B | Seattle Rocketeers | 28 | 02/03/2013 | Kishiwada | JPN | Right | Right | 5' 10" | 190 lbs | $980,000 |
| Overshown, DeMarvion | LF | Montana Pandas | 28 | 02/24/2013 | San Antonio | USA | Left | Left | 6' 6" | 245 lbs | $4,200,000 |
| Ozezera, Jorge | 1B | Kingston Township Knights | 28 | 07/25/2013 | Queens | USA | Right | Right | 6' 4" | 245 lbs | $420,000 |
