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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Neil, Dave | SP | Seattle Rocketeers | 26 | 06/02/2016 | Canton | USA | Right | Left | 6' 1" | 195 lbs | $420,000 |
| O'Quinlevan, Dana | C | Seattle Rocketeers | 22 | 04/03/2020 | Vallejo | USA | Right | Right | 6' 0" | 200 lbs | $280,000 |
| Ohayashi, Koryusai | CF | Brooklyn Dodgers | 23 | 04/26/2019 | Tomakomai | JPN | Switch | Right | 6' 4" | 195 lbs | $280,000 |
| Oliwa, Ainanani | RP | Vancouver Grey Wolves | 30 | 01/23/2012 | Nuuuli | ASA | Right | Right | 5' 10" | 180 lbs | $400,000 |
| Olthof, Gerold | C | Athletic Club KC | 31 | 06/23/2011 | Veghel | NED | Right | Right | 6' 1" | 215 lbs | $2,310,000 |
| Olthuis, Henny | SP | Athletic Club KC | 18 | 12/03/2024 | Barendrecht | NED | Right | Right | 6' 3" | 195 lbs | - |
| Onishi, Yasuhiko | C | Seattle Rocketeers | 26 | 02/13/2016 | Kushiro | JPN | Switch | Right | 5' 11" | 205 lbs | $2,550,000 |
| Ortega, Carlos | RP | Athletic Club KC | 23 | 10/01/2019 | Hazard | USA | Right | Left | 6' 0" | 180 lbs | $280,000 |
| Ortíz, Pedro | SP | Pittsburgh Kingfishers | 17 | 08/29/2025 | Delgado | SLV | Left | Right | 6' 6" | 200 lbs | - |
| Osiman, Bungay | CL | Echo Park Lakers | 21 | 01/01/2021 | Manila | PHI | Left | Right | 6' 8" | 215 lbs | $280,000 |
| Ota, Yakamochi | 3B | Seattle Rocketeers | 29 | 02/03/2013 | Kishiwada | JPN | Right | Right | 5' 10" | 195 lbs | $980,000 |
| Otani, Tsugahara | CF | Nashville Outlaws | 17 | 11/03/2025 | Hirosaki | JPN | Left | Right | 6' 2" | 175 lbs | - |
