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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Aaron | SP | Grand Junction Rockies | 20 | 10/24/2029 | Tamalpais-Homestead Valley | USA | Right | Right | 6' 1" | 190 lbs | - |
| O'Connell, Lewis | SS | Bluefield Blue Jays | 20 | 07/11/2029 | Burnaby | CAN | Right | Right | 6' 0" | 170 lbs | - |
| O'Dwyer, Jim | 1B | Pulaski Yankees | 20 | 09/29/2029 | Montreal | CAN | Right | Right | 6' 5" | 215 lbs | - |
| Ocampo, Victor | RP | Seattle (APP) Mariners | 21 | 06/27/2028 | San Miguelito | PAN | Left | Right | 6' 4" | 195 lbs | - |
| Ochoa, Willie | C | Detroit (APP) Tigers | 27 | 06/12/2022 | San Diego | USA | Right | Right | 6' 5" | 205 lbs | - |
| Ogura, Takao | CF | Miami (APP) Marlins | 21 | 03/09/2028 | Sapporo | JPN | Left | Left | 6' 4" | 200 lbs | - |
| Ojeda, Manny | RP | Seattle (APP) Mariners | 21 | 09/18/2028 | Santo Domingo | DOM | Switch | Right | 6' 2" | 190 lbs | - |
| Okazaki, Mamoru | SP | Helena Brewers | 17 | 10/25/2032 | Tomioka | JPN | Left | Left | 6' 5" | 195 lbs | - |
| Okazaki, Mitsuaki | RP | Bluefield Blue Jays | 21 | 01/03/2028 | Toyooka | JPN | Right | Right | 6' 7" | 190 lbs | - |
| Oliva, Noe | CF | San Francisco (APP) Giants | 21 | 04/25/2028 | San Carlos | NCA | Right | Right | 6' 4" | 195 lbs | - |
| Oliveros, Juan | RP | Billings Mustangs | 21 | 12/11/2028 | San Andrés | PAN | Right | Right | 6' 5" | 200 lbs | - |
| Olmos, Tony | 1B | Miami (APP) Marlins | 18 | 04/21/2031 | Detroit | USA | Left | Left | 6' 1" | 200 lbs | - |
| Olson, John | SP | Seattle (APP) Mariners | 20 | 03/10/2029 | Reno | USA | Right | Right | 6' 2" | 190 lbs | - |
| Olvera, Antonio | SP | Cleveland (APP) Indians | 21 | 05/02/2028 | La Joya | MEX | Right | Right | 6' 4" | 180 lbs | - |
| Omori, Toshikatsu | 1B | Princeton Rays | 23 | 07/19/2026 | Kitakyushu | JPN | Right | Right | 6' 3" | 200 lbs | - |
| Ortiz, Albert | C | Texas (APP) Rangers | 24 | 03/02/2025 | Poteet | USA | Switch | Right | 6' 4" | 200 lbs | - |
| Ortiz, Dave | C | Pulaski Yankees | 21 | 11/23/2028 | Güira de Melena | CUB | Left | Right | 6' 1" | 200 lbs | - |
| Ortiz, Jon | LF | Washington (APP) Nationals | 21 | 07/12/2028 | Panama | PAN | Right | Right | 6' 4" | 200 lbs | - |
| Ortiz, Jose | RP | Washington (APP) Nationals | 20 | 07/01/2029 | Masaya | NCA | Right | Right | 6' 0" | 185 lbs | - |
| Ortiz, Ricardo | 1B | San Diego (APP) Padres | 24 | 04/23/2025 | Detroit | USA | Right | Right | 6' 1" | 200 lbs | - |
| Ortiz, Robert | RF | Baltimore (APP) Orioles | 21 | 11/08/2028 | Río Grande | PUR | Left | Left | 6' 8" | 200 lbs | - |
| Osorio, Travis | SP | Missoula Osprey | 23 | 01/19/2026 | Laurence Harbor | USA | Left | Left | 6' 2" | 190 lbs | - |
| Otieno, Lencho | SS | Chicago (APP) Cubs | 21 | 11/09/2028 | Garissa | KEN | Right | Right | 6' 5" | 200 lbs | - |
