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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Cosgrove, Dave | RP | Letterkenny Shamrocks | 27 | 04/25/2025 | Albuquerque | USA | Left | Left | 6' 3" | 205 lbs | $500,000 |
| O'Criodan, Alan | RP | Reykjavik Phoenix | 26 | 07/04/2026 | Lakeville | USA | Left | Right | 6' 0" | 205 lbs | $500,000 |
| O'Neil, Greg | C | Free Agent | 27 | 08/01/2025 | Camden | USA | Switch | Right | 6' 0" | 220 lbs | - |
| O'Quinn, Bobby | RP | Ludington LumberJacks | 32 | 11/01/2020 | Wheaton-Glenmont | USA | Right | Right | 6' 4" | 215 lbs | $4,000,000 |
| O'Toole, Ken | C | Free Agent | 20 | 10/17/2032 | Wenham | USA | Left | Right | 5' 9" | 175 lbs | - |
| Ocampo, José | 2B | Letterkenny Shamrocks | 25 | 02/27/2028 | Simi Valley | USA | Right | Right | 6' 4" | 195 lbs | $500,000 |
| Ochoa, Graviel | SP | Texas Renegades | 17 | 06/19/2035 | Tibagi | BRA | Switch | Right | 6' 4" | 190 lbs | - |
| Odom, Todd | SP | Free Agent | 22 | 01/31/2031 | Sacramento | USA | Right | Right | 6' 4" | 205 lbs | - |
| Oka, Tsugiharu | 2B | Free Agent | 20 | 03/29/2033 | Yachiyo | JPN | Right | Right | 6' 1" | 190 lbs | - |
| Okada, Tokuma | 2B | Free Agent | 26 | 12/11/2026 | Sakaiminato | JPN | Left | Right | 5' 11" | 200 lbs | - |
| Okawa, Keisuke | 2B | Ypsi Yard Cats | 18 | 05/15/2034 | Kitakyushu | JPN | Switch | Right | 6' 1" | 175 lbs | - |
| Okimasa, Takamori | 2B | Nashville Nightmare | 26 | 12/23/2026 | Yokohama | JPN | Right | Right | 6' 4" | 210 lbs | $500,000 |
| Okubo, Shunen | SP | Motown Hitmakers | 19 | 03/31/2034 | Miyoshi | JPN | Right | Right | 5' 10" | 160 lbs | - |
| Olague, David | C | Free Agent | 22 | 04/05/2031 | Seattle | USA | Left | Right | 5' 11" | 185 lbs | - |
| Oliver, Karl | SP | Wildwood Fishers | 18 | 07/11/2034 | Bradford | CAN | Right | Right | 6' 7" | 210 lbs | - |
| Olivo, Jorge | 3B | Wicker Park Devil Cats | 16 | 02/05/2037 | Villa Riva | DOM | Right | Right | 6' 2" | 180 lbs | - |
| Olopoto, Zakaria | C | Ypsi Yard Cats | 27 | 12/01/2025 | Vailele | SAM | Right | Right | 6' 0" | 220 lbs | $1,550,000 |
| Olvera, Richie | SP | Columbus Red Birds | 33 | 06/06/2019 | Meridian | USA | Right | Right | 6' 1" | 215 lbs | $2,500,000 |
| Om, Tae-ho | RF | Wildwood Fishers | 18 | 09/14/2034 | Yongju | KOR | Left | Left | 6' 1" | 190 lbs | - |
| Onishi, Kuemon | SP | Texas Renegades | 16 | 04/22/2036 | Harima | JPN | Left | Left | 6' 5" | 195 lbs | - |
| Orr, David | 3B | Free Agent | 27 | 02/15/2026 | Calgary | CAN | Right | Right | 6' 0" | 185 lbs | - |
| Ortega, John | CF | Texas Renegades | 19 | 08/12/2033 | Cabo Rojo | PUR | Switch | Right | 6' 1" | 175 lbs | - |
| Ortega, Raúl | SP | Central Valley Turkey Vultures | 18 | 01/21/2035 | La Victoria | DOM | Right | Right | 6' 2" | 170 lbs | - |
| Ortíz, Aurelio | SP | Wildwood Fishers | 18 | 07/06/2034 | San Miguelito | PAN | Right | Right | 6' 4" | 185 lbs | - |
| Ortíz, Edgar | LF | Nashville Nightmare | 27 | 04/05/2026 | Santiago de Cuba | CUB | Right | Right | 6' 1" | 190 lbs | $500,000 |
| Ortíz, Guillermo | 2B | Dam Site Drifters | 28 | 07/27/2024 | Cuautla | MEX | Right | Right | 6' 0" | 200 lbs | $1,900,000 |
| Ortíz, Norberto | SP | Ypsi Yard Cats | 18 | 01/19/2035 | Vega Alta | PUR | Left | Left | 6' 6" | 200 lbs | - |
| Ortíz, Raúl | RF | Free Agent | 21 | 07/03/2031 | Eglin AFB | USA | Right | Right | 6' 1" | 195 lbs | - |
| Ortíz, Sally | LF | Free Agent | 26 | 10/29/2026 | Morón | CUB | Right | Left | 5' 10" | 180 lbs | - |
| Ortíz, Sixto | LF | Free Agent | 30 | 02/03/2023 | Las Tunas | CUB | Left | Left | 6' 1" | 215 lbs | - |
| Ortíz, Tony | SP | Wicker Park Devil Cats | 19 | 01/25/2034 | León | MEX | Right | Right | 6' 2" | 175 lbs | - |
| Osborne, Sal | 2B | Free Agent | 27 | 07/25/2025 | New York | USA | Left | Right | 6' 4" | 205 lbs | - |
| Osborne, Tim | 3B | Free Agent | 21 | 10/08/2031 | Franconia | USA | Left | Right | 6' 1" | 200 lbs | - |
| Osorio, Luis | RP | Dam Site Drifters | 28 | 02/12/2025 | Ocotlan | MEX | Right | Right | 6' 4" | 210 lbs | $500,000 |
| Overton, Dave | LF | Phoenix Downs | 30 | 02/05/2023 | Queens | USA | Switch | Right | 6' 2" | 195 lbs | $14,340,000 |
| Ow, Fu-Kang | SP | Iowa City Stalkers | 23 | 05/07/2029 | Nandun | CHN | Left | Left | 6' 4" | 200 lbs | $500,000 |
| Owen, Joe | RP | Letterkenny Shamrocks | 27 | 01/09/2026 | Waseca | USA | Right | Right | 6' 6" | 235 lbs | $500,000 |
| Owry, Chris | 1B | Great Black Swamp Mud Hens | 19 | 10/15/2033 | Oshawa | CAN | Left | Left | 6' 3" | 205 lbs | - |
| Oyama, Yorikane | 1B | Free Agent | 40 | 02/05/2013 | Fukuma | JPN | Switch | Right | 6' 0" | 215 lbs | - |
| Ozu, Shosuke | CF | Dam Site Drifters | 17 | 08/27/2035 | Kamogata | JPN | Right | Right | 6' 4" | 190 lbs | - |
