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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Bryan, Marcus | SP | Frisco Rough Riders | 26 | 04/30/2025 | Tarentum | USA | Left | Left | 6' 4" | 200 lbs | - |
| O'Donel, Lance | SP | Buffalo LightSabres | 24 | 09/25/2027 | San Francisco | USA | Left | Left | 6' 4" | 205 lbs | - |
| O'Farrell, Bill | 3B | Buffalo LightSabres | 24 | 01/31/2027 | Bend | USA | Right | Right | 6' 2" | 200 lbs | - |
| O'Neal, Jeff | 3B | Delano Tigers | 26 | 02/18/2025 | North Las Vegas | USA | Right | Right | 6' 2" | 200 lbs | - |
| O'Neal, Mike | RP | Bismarck Black Mambas | 21 | 01/25/2030 | Murfreesboro | USA | Right | Right | 6' 0" | 180 lbs | - |
| O'Neal, Nicholas | CF | Bismarck Black Mambas | 24 | 02/04/2027 | Lemay | USA | Right | Right | 6' 1" | 180 lbs | - |
| O'Reilly, Andy | SS | Free Agent | 24 | 03/10/2027 | New York | USA | Right | Right | 6' 1" | 200 lbs | - |
| O'Reilly, Wendell | LF | Bismark Border Guards | 25 | 09/06/2026 | Salem | USA | Left | Right | 6' 4" | 200 lbs | - |
| Ojima, Suezo | 3B | Bismark Border Guards | 25 | 03/05/2026 | Inuyama | JPN | Right | Right | 6' 0" | 185 lbs | - |
| Okada, Yoshii | 1B | Santa Fe Diablos | 29 | 05/29/2022 | Koriyama | JPN | Left | Left | 6' 2" | 200 lbs | - |
| Oliveira, José | CF | Butler White Sox | 26 | 05/20/2025 | Santo Domingo | DOM | Left | Left | 6' 0" | 195 lbs | - |
| Oliver, John | 1B | Reading Rainbows | 26 | 06/24/2025 | Barrington | USA | Left | Left | 6' 4" | 205 lbs | - |
| Oluniide, Ato | 2B | Minnesota North Stars | 28 | 02/03/2023 | Botshabelo | RSA | Right | Right | 6' 1" | 195 lbs | - |
| Onindo, Adelkria | SP | Gainesville Guidos | 25 | 06/03/2026 | Cape Town | RSA | Right | Right | 6' 0" | 190 lbs | - |
| Orr, Patrick | CL | Butler White Sox | 25 | 09/03/2026 | Huntington Station | USA | Left | Left | 6' 8" | 205 lbs | - |
| Ortega, Claudio | RF | West Virginia Power | 27 | 05/27/2024 | La Victoria | VEN | Left | Left | 6' 3" | 200 lbs | - |
| Ortíz, Gil | C | Santa Fe Diablos | 26 | 01/20/2025 | Chaska | USA | Left | Right | 6' 1" | 195 lbs | - |
| Ortíz, Ricardo | SS | Free Agent | 26 | 09/12/2025 | Chester | USA | Right | Right | 6' 1" | 195 lbs | - |
| Owen, Larry | SP | Free Agent | 25 | 11/29/2025 | Los Angeles | USA | Right | Right | 6' 7" | 200 lbs | - |
| Owens, Garth | C | Casper Ghosts | 25 | 09/02/2026 | Wichita | USA | Left | Right | 6' 0" | 200 lbs | - |
| Owens, Rodger | C | Culver City Extras | 25 | 02/21/2026 | Hanover Park | USA | Right | Right | 6' 0" | 200 lbs | - |
