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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Banner, Armani | 2B | Cleveland Guardians | 28 | 02/11/2014 | Westlake | USA | Right | Right | 6' 0" | 200 lbs | $555,000 |
| O'Brien, Erik | SP | Free Agent | 16 | 11/13/2025 | San Antonio | USA | Left | Left | 6' 3" | 190 lbs | - |
| O'Brien, Steve | SP | Free Agent | 16 | 10/13/2025 | Miami Gardens | USA | Right | Right | 6' 8" | 200 lbs | - |
| O'Connor, Tommy | SS | Free Agent | 17 | 05/04/2025 | Audubon Park | USA | Right | Right | 6' 0" | 165 lbs | - |
| O'Donnell, Ricky | SP | Free Agent | 34 | 12/18/2007 | Golden Glades | USA | Left | Left | 6' 1" | 200 lbs | - |
| O'Hare, Billy | SP | Houston Astros | 30 | 05/25/2012 | Carson City | USA | Switch | Right | 6' 2" | 200 lbs | $3,441,000 |
| O'Shea, Ben | CF | Free Agent | 21 | 06/09/2021 | Bolingbrook | USA | Left | Left | 6' 1" | 185 lbs | - |
| Oakley, Jamie | CF | Free Agent | 20 | 10/05/2021 | Linganore-Bartonsville | USA | Right | Right | 6' 0" | 190 lbs | - |
| Ocampo, Arturo | SP | Free Agent | 16 | 09/23/2025 | Fitchburg | USA | Right | Right | 6' 3" | 180 lbs | - |
| Ochoa, Juan | 3B | Atlanta Braves | 28 | 04/09/2014 | Caracas | VEN | Left | Right | 6' 1" | 200 lbs | $6,618,000 |
| Ochoa, Luis | SP | Chicago Cubs | 16 | 10/21/2025 | La Vega | DOM | Switch | Right | 6' 4" | 185 lbs | - |
| Ochoa, Luis | SP | Chicago White Sox | 16 | 11/08/2025 | Maracaibo | VEN | Right | Right | 6' 4" | 180 lbs | - |
| Ochoa, Nesty | C | Arizona Diamondbacks | 16 | 08/15/2025 | Hato Mayor | DOM | Right | Right | 6' 1" | 185 lbs | - |
| Ochoa, Zach | RP | Los Angeles Dodgers | 33 | 10/23/2008 | Port Hueneme | USA | Right | Right | 6' 3" | 205 lbs | $1,300,000 |
| Ogas, Eric | RP | Boston Red Sox | 27 | 07/03/2015 | Ft. Gibson | USA | Left | Right | 6' 5" | 205 lbs | $555,000 |
| Oglesby, Jake | CF | Chicago White Sox | 23 | 02/03/2019 | Country Club | USA | Left | Right | 6' 5" | 190 lbs | $555,000 |
| Oken, A.J. | SP | Free Agent | 15 | 11/25/2026 | Grafton | USA | Right | Right | 6' 6" | 190 lbs | - |
| Olague, Jorge | LF | Seattle Mariners | 24 | 06/13/2018 | Soledad | MEX | Left | Right | 6' 4" | 200 lbs | $555,000 |
| Olea, Gilberto | SP | Free Agent | 35 | 10/01/2006 | Cúa | VEN | Switch | Right | 6' 6" | 200 lbs | - |
| Oliphant, Phil | SS | Free Agent | 20 | 12/01/2021 | East Providence | USA | Right | Right | 6' 2" | 180 lbs | - |
| Olivas, DeMario | SP | St. Louis Cardinals | 19 | 04/15/2023 | Petare | VEN | Left | Left | 6' 3" | 185 lbs | - |
| Oliver, Steve | SP | Milwaukee Brewers | 24 | 01/16/2018 | Montebello | USA | Right | Right | 6' 6" | 205 lbs | $555,000 |
| Olvera, Jorge | SP | Detroit Tigers | 19 | 12/30/2022 | Santo Domingo | DOM | Right | Right | 6' 1" | 180 lbs | - |
| Olvera, Juan | 3B | Cleveland Guardians | 17 | 10/25/2024 | Jarabacoa | DOM | Right | Right | 6' 1" | 175 lbs | - |
| Onate, Juan | SP | Free Agent | 36 | 03/03/2006 | Santo Domingo | DOM | Right | Right | 6' 1" | 200 lbs | - |
| Ontiveros, Arturo | SS | Atlanta Braves | 19 | 01/13/2023 | Santo Domingo | DOM | Right | Right | 6' 0" | 175 lbs | - |
| Ontiveros, Juan | SP | San Diego Padres | 17 | 01/19/2025 | Santo Domingo | DOM | Right | Right | 6' 8" | 205 lbs | - |
| Ontiveros, Luis | CF | Tampa Bay Rays | 34 | 12/03/2007 | Santo Domingo | DOM | Right | Right | 6' 4" | 200 lbs | $30,000,000 |
| Orellana, Jorge | DH | New York Yankees | 35 | 09/12/2006 | San José de Ocoa | DOM | Left | Left | 6' 1" | 205 lbs | $33,600,000 |
| Orense, Carmem | 2B | Seattle Mariners | 17 | 02/04/2025 | Valencia | VEN | Left | Right | 6' 1" | 175 lbs | - |
| Oroz, Luis | RP | Milwaukee Brewers | 34 | 07/25/2007 | Cataño | PUR | Right | Right | 6' 2" | 200 lbs | $555,000 |
| Orozco, Ernesto | 3B | Free Agent | 17 | 11/30/2024 | Marina | USA | Right | Right | 6' 3" | 195 lbs | - |
| Orozco, Ernesto | SS | Baltimore Orioles | 16 | 10/01/2025 | Montellano | DOM | Right | Right | 6' 1" | 175 lbs | - |
| Orozco, Ezequiel | SS | St. Louis Cardinals | 28 | 05/20/2014 | Pacora | PAN | Right | Right | 6' 4" | 200 lbs | $555,000 |
| Orozco, Jorge | SP | Free Agent | 17 | 04/04/2025 | Carolina | PUR | Right | Right | 6' 5" | 180 lbs | - |
| Orozco, Jorge | 2B | Cincinnati Reds | 18 | 04/03/2024 | San Pedro de Macorís | DOM | Right | Right | 6' 1" | 175 lbs | - |
| Ortega, Alfredo | CF | Free Agent | 17 | 07/25/2024 | Detroit | USA | Left | Left | 6' 2" | 175 lbs | - |
| Ortega, Manuele | SS | Houston Astros | 17 | 04/11/2025 | Charallave | VEN | Right | Right | 6' 2" | 175 lbs | - |
| Ortega, Vito | 2B | Cleveland Guardians | 27 | 09/17/2014 | Grimes | USA | Right | Right | 6' 4" | 200 lbs | $2,380,000 |
| Ortez, Juan | CF | Colorado Rockies | 16 | 05/28/2026 | Santo Domingo | DOM | Switch | Right | 6' 1" | 180 lbs | - |
| Orton, Kevin | SP | Free Agent | 20 | 09/02/2021 | Tampa | USA | Left | Left | 6' 2" | 190 lbs | - |
| Osuna, Ernesto | RP | Free Agent | 37 | 05/10/2005 | Dennis Port | USA | Left | Right | 6' 1" | 200 lbs | - |
| Oswalt, Jon | RP | Free Agent | 16 | 09/22/2025 | New Orleans | USA | Right | Right | 6' 2" | 170 lbs | - |
| Ott, Jimmy | SP | Free Agent | 18 | 05/09/2024 | Los Angeles | USA | Right | Right | 6' 5" | 190 lbs | - |
| Otten, Mike | 1B | Arizona Diamondbacks | 30 | 12/24/2011 | Richmond | USA | Left | Right | 6' 2" | 200 lbs | $3,120,000 |
| Outterbridge, Kymani | RP | Oakland Athletics | 30 | 12/01/2011 | Middletown | USA | Right | Right | 6' 3" | 205 lbs | $555,000 |
| Ovalle, Jorge | SP | Minnesota Twins | 27 | 11/10/2014 | Comerío | PUR | Right | Right | 6' 0" | 210 lbs | $2,040,000 |
| Overresch, Oskar | SP | Los Angeles Angels | 16 | 07/30/2025 | Bremen | GER | Right | Right | 6' 6" | 195 lbs | - |
| Overturf, Joe | SP | Washington Nationals | 33 | 06/22/2009 | De Pere | USA | Right | Right | 5' 10" | 200 lbs | $2,500,000 |
| Owens, Jared | RP | Free Agent | 17 | 04/25/2025 | Stamford | USA | Left | Left | 6' 7" | 185 lbs | - |
| Oyoque, Juan | LF | Miami Marlins | 31 | 01/16/2011 | Río Grande | PUR | Left | Right | 6' 0" | 200 lbs | $9,500,000 |
