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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connor, Jared | 3B | Kansas City (WIN) Royals | 23 | 07/23/2022 | Toledo | USA | Switch | Right | 6' 0" | 180 lbs | - |
| Obawole, Torquato | 2B | Miami (WIN) Marlins | 22 | 02/01/2023 | Quinhamel | GNB | Right | Right | 6' 1" | 190 lbs | - |
| Ocana, Mario | SS | Tampa Bay (WIN) Rays | 22 | 11/13/2023 | Tucupita | VEN | Left | Right | 6' 2" | 195 lbs | - |
| Ogg, Sam | 1B | Free Agent | 24 | 01/13/2021 | Berwyn | USA | Left | Left | 6' 2" | 200 lbs | - |
| Olausson, Joel | RP | Pittsburgh (WIN) Pirates | 22 | 04/01/2023 | Canton | USA | Right | Right | 6' 1" | 195 lbs | - |
| Olivo, Frank | LF | Boston (WIN) Red Sox | 20 | 01/10/2025 | Murrells Inlet | USA | Left | Right | 6' 0" | 190 lbs | - |
| Olivo, Jon | RP | Boston (WIN) Red Sox | 21 | 07/07/2024 | Coyuca | MEX | Right | Right | 6' 7" | 210 lbs | - |
| Olkowicz, Ernest | LF | Asheville Tourists | 25 | 01/08/2020 | Jesup | USA | Right | Right | 6' 7" | 200 lbs | - |
| Olmstead, Justin | LF | Houston (WIN) Astros | 23 | 07/25/2022 | Ogden | USA | Right | Right | 6' 0" | 195 lbs | - |
| Olsen, Mike | LF | Free Agent | 27 | 05/29/2018 | Camden | USA | Right | Right | 6' 1" | 205 lbs | - |
| Olsen, Tim | LF | St. Louis (WIN) Cardinals | 25 | 03/28/2020 | Biddeford | USA | Left | Right | 6' 0" | 200 lbs | $650,000 |
| Omoto, Hideharu | SP | Pittsburgh (WIN) Pirates | 25 | 10/30/2020 | Itako | JPN | Left | Left | 5' 8" | 180 lbs | - |
| Ortega, Darrell | RF | Free Agent | 25 | 06/08/2020 | Weymouth | USA | Left | Left | 6' 3" | 205 lbs | - |
| Osborne, Harry | SP | Washington (WIN) Nationals | 22 | 10/04/2023 | Trois-Rivières | CAN | Left | Left | 6' 6" | 200 lbs | - |
| Osgood, Mike | CL | Boston (WIN) Red Sox | 20 | 11/01/2025 | Detroit | USA | Left | Right | 6' 5" | 200 lbs | - |
| Osika, Dan | RP | Free Agent | 32 | 10/19/2013 | Canton | USA | Right | Right | 6' 7" | 200 lbs | - |
| Ostlund, Bill | RF | Baltimore (WIN) Orioles | 27 | 08/17/2018 | Los Angeles | USA | Left | Left | 6' 3" | 205 lbs | - |
| Osumi, Yasushi | SP | Asheville Tourists | 31 | 04/02/2014 | Saijo | JPN | Left | Right | 6' 4" | 200 lbs | - |
| Overlie, Justin | CL | New York (WIN) Mets | 21 | 02/20/2024 | Salt Lake City | USA | Right | Right | 5' 11" | 175 lbs | - |
| Ovitt, Eric | SP | Free Agent | 34 | 11/10/2011 | Vineland | USA | Right | Right | 6' 2" | 205 lbs | - |
| Ozuna, Nelson | CF | Pittsburgh (WIN) Pirates | 29 | 08/21/2016 | San Cristóbal | DOM | Right | Right | 6' 1" | 195 lbs | - |
