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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Steve | 3B | Colorado Rockies | 33 | 11/24/2008 | New York | USA | Right | Right | 6' 2" | 200 lbs | $4,800,000 |
| O'Bryan, Clarence | RP | Free Agent | 18 | 05/04/2024 | Paradise Valley | USA | Right | Right | 6' 4" | 185 lbs | - |
| O'Bryan, Jeff | RP | Detroit Tigers | 31 | 10/25/2010 | Key West | USA | Switch | Right | 6' 3" | 200 lbs | $750,000 |
| O'Bryant, Leo | SP | Free Agent | 22 | 05/02/2020 | Sierra Vista | USA | Right | Right | 5' 9" | 170 lbs | - |
| O'Connor, J.J. | CF | Free Agent | 17 | 09/21/2024 | Farmers Branch | USA | Right | Right | 6' 0" | 170 lbs | - |
| O'Connor, Mike | SP | Free Agent | 20 | 10/29/2021 | Greenville | USA | Left | Left | 6' 1" | 180 lbs | - |
| O'Cuirneen, Steve | RP | Baltimore Orioles | 27 | 05/10/2014 | Rancho Palos Verdes | USA | Right | Right | 6' 3" | 200 lbs | $1,200,000 |
| O'Day, Oscar | SP | Free Agent | 23 | 04/13/2019 | Columbia | USA | Right | Right | 6' 6" | 205 lbs | - |
| O'Day, Quentin | RP | Free Agent | 20 | 12/13/2021 | Chicago | USA | Left | Right | 6' 2" | 200 lbs | - |
| O'Dell, Dorian | SP | Free Agent | 16 | 09/05/2025 | Bandon | USA | Right | Right | 6' 6" | 195 lbs | - |
| O'Dell, Duane | SP | Cincinnati Reds | 26 | 07/23/2015 | Ft. Worth | USA | Right | Right | 6' 0" | 180 lbs | $5,250,000 |
| O'Donnell, Ken | RP | Free Agent | 23 | 11/06/2018 | Santa Ana | USA | Right | Right | 6' 3" | 200 lbs | - |
| O'Gavagan, Jim | SP | Free Agent | 21 | 06/10/2020 | Cut Bank | USA | Right | Right | 6' 1" | 190 lbs | - |
| O'Halloran, Chet | C | Free Agent | 20 | 07/13/2021 | Houston | USA | Right | Right | 6' 2" | 195 lbs | - |
| O'Halloran, Cliff | 3B | Kansas City Royals | 25 | 04/10/2017 | Glendale | USA | Right | Right | 6' 3" | 200 lbs | $750,000 |
| O'Halloran, Mike | LF | Tampa Bay Rays | 31 | 06/20/2010 | Richmond Heights | USA | Left | Left | 6' 6" | 205 lbs | $1,500,000 |
| O'Halloran, P.J. | C | Free Agent | 17 | 10/29/2024 | Stamford | USA | Right | Right | 6' 4" | 200 lbs | - |
| O'Hartagan, Sonny | SP | Free Agent | 20 | 11/24/2021 | Newport News | USA | Right | Right | 6' 5" | 190 lbs | - |
| O'Herlihy, Bob | 2B | Philadelphia Phillies | 31 | 06/09/2010 | Schenectady | USA | Right | Right | 6' 2" | 200 lbs | $1,900,000 |
| O'Hickey, Dan | SP | Free Agent | 22 | 02/05/2020 | Tucker | USA | Left | Left | 6' 3" | 185 lbs | - |
| O'Higgins, Brad | RF | Free Agent | 18 | 04/14/2024 | West Bountiful | USA | Right | Left | 6' 5" | 190 lbs | - |
| O'Higgins, Chris | 2B | Free Agent | 18 | 01/16/2024 | Henderson | USA | Right | Right | 6' 0" | 160 lbs | - |
| O'Kinsella, Tim | RF | Houston Astros | 31 | 10/26/2010 | Mt. Pocono | USA | Right | Right | 6' 2" | 205 lbs | $5,465,000 |
| O'Loughlin, Joe | CF | Free Agent | 21 | 12/12/2020 | East Atlantic Beach | USA | Left | Left | 6' 4" | 200 lbs | - |
| O'Meara, Rod | SP | Free Agent | 16 | 10/07/2025 | Green | USA | Right | Right | 6' 2" | 170 lbs | - |
| O'Mooney, Bob | C | Free Agent | 32 | 03/31/2010 | Tampa | USA | Switch | Right | 6' 0" | 200 lbs | - |
| O'Neal, Greg | RF | Free Agent | 17 | 09/22/2024 | South Miami Heights | USA | Left | Left | 6' 6" | 200 lbs | - |
| O'Neal, Jim | RP | Free Agent | 25 | 05/24/2016 | Conyers | USA | Switch | Left | 6' 4" | 200 lbs | - |
| O'Neal, Ronnie | SP | Free Agent | 17 | 09/17/2024 | Marion | USA | Right | Right | 6' 8" | 200 lbs | - |
| O'Neil, Dave | 1B | Free Agent | 18 | 05/31/2023 | Sioux Falls | USA | Right | Left | 6' 3" | 210 lbs | - |
| O'Quinn, Terrence | 2B | Free Agent | 21 | 01/27/2021 | St. Louis | USA | Switch | Right | 6' 0" | 180 lbs | - |
| O'Quinn, Tony | RP | Oakland Athletics | 32 | 01/13/2010 | East Peoria | USA | Right | Right | 6' 1" | 200 lbs | $7,600,000 |
| O'Reilly, Curt | SP | Free Agent | 19 | 10/26/2022 | Nicholasville | USA | Right | Right | 6' 4" | 185 lbs | - |
| O'Rorke, Dave | 1B | Free Agent | 37 | 11/27/2004 | Cambridge | USA | Left | Right | 6' 2" | 200 lbs | - |
| O'Sullivan, Bobby | 3B | Free Agent | 16 | 06/05/2025 | Bartlett | USA | Right | Right | 6' 2" | 180 lbs | - |
| O'Toole, Steve | SS | Free Agent | 16 | 07/30/2025 | Portland | USA | Right | Right | 6' 1" | 165 lbs | - |
| Oberste, Juan | RP | Free Agent | 20 | 09/07/2021 | Norman | USA | Right | Left | 5' 10" | 165 lbs | - |
| Ocasio, Juan | SS | Baltimore Orioles | 19 | 09/07/2022 | Bonao | DOM | Right | Right | 6' 4" | 190 lbs | - |
| Oceguera, Alfredo | SP | Free Agent | 20 | 07/12/2021 | San Diego Country Estates | USA | Right | Right | 6' 3" | 190 lbs | - |
| Ody, Jeremy | SP | Free Agent | 19 | 10/28/2022 | Greenfield | USA | Switch | Right | 6' 4" | 185 lbs | - |
| Oglethorpe, Pat | 1B | Free Agent | 24 | 08/01/2017 | Logansport | USA | Right | Right | 6' 0" | 200 lbs | - |
| Ohashi, Ietsuna | RP | Free Agent | 23 | 07/28/2018 | Yamagata | JPN | Left | Left | 6' 2" | 195 lbs | - |
| Ohayashi, Yoshio | RP | Free Agent | 24 | 05/01/2018 | Tokyo | JPN | Left | Left | 6' 8" | 225 lbs | - |
| Ojeda, Jorge | 1B | Free Agent | 33 | 11/20/2008 | Ciudad Ojeda | VEN | Left | Left | 6' 8" | 200 lbs | - |
| Ojeda, Rodrigo | C | Cleveland Guardians | 25 | 11/30/2016 | Duvergé | DOM | Right | Right | 6' 3" | 200 lbs | $750,000 |
| Ojeda, Sancho | SP | Free Agent | 17 | 02/12/2025 | Sunrise Manor | USA | Left | Left | 6' 4" | 180 lbs | - |
| Oka, Masaharu | CF | Carolina Catamounts | 17 | 06/17/2024 | Shirakawa | JPN | Right | Right | 6' 1" | 175 lbs | - |
| Okabe, Akihiro | RP | Free Agent | 30 | 11/17/2011 | Ueda | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Olin, Wes | 3B | Free Agent | 15 | 05/23/2026 | Stuart | USA | Left | Right | 6' 0" | 165 lbs | - |
| Oliveira, Jesús | SP | Cincinnati Reds | 18 | 06/14/2023 | Puerto Plata | DOM | Right | Right | 6' 0" | 175 lbs | - |
| Oliver, Joe | SP | Free Agent | 16 | 03/10/2026 | Mesa | USA | Left | Left | 6' 5" | 185 lbs | - |
| Oliver, Tim | SP | Free Agent | 20 | 02/10/2022 | Inverness | USA | Right | Right | 6' 5" | 190 lbs | - |
| Oliver, Zak | CF | Free Agent | 21 | 02/25/2021 | Woodridge | USA | Switch | Right | 6' 0" | 185 lbs | - |
| Olivo, Manny | SP | Free Agent | 22 | 01/06/2020 | Ontario | USA | Right | Right | 6' 7" | 205 lbs | - |
| Olsen, Thad | SP | Free Agent | 17 | 06/28/2024 | Nashua | USA | Right | Right | 5' 11" | 160 lbs | - |
| Olson, Arizona | RP | Free Agent | 24 | 03/08/2018 | Ypsilanti | USA | Left | Right | 6' 0" | 190 lbs | - |
| Olson, Dan | 1B | Free Agent | 22 | 01/16/2020 | Longview | USA | Left | Left | 6' 4" | 225 lbs | - |
| Olson, Eric | LF | Free Agent | 29 | 12/21/2012 | Tucson | USA | Left | Left | 6' 3" | 205 lbs | - |
| Olson, Jake | RP | Free Agent | 23 | 09/08/2018 | Boston | USA | Left | Right | 6' 6" | 195 lbs | - |
| Olson, Mike | SP | Free Agent | 17 | 09/09/2024 | Brooklyn | USA | Left | Left | 6' 2" | 180 lbs | - |
| Olvera, Álex | SS | Atlanta Braves | 19 | 10/06/2022 | San Francisco de Macorís | DOM | Right | Right | 6' 4" | 185 lbs | - |
| Onslow, Willie | RP | Mexico City Padres | 28 | 07/29/2013 | Lakeland | USA | Right | Right | 6' 2" | 195 lbs | $2,500,000 |
| Oolbekkink, Jonas | C | Chicago (N) Cubs | 18 | 01/05/2024 | Kralendijk | ANT | Switch | Right | 6' 1" | 180 lbs | - |
| Orby, Derek | 3B | Boston Red Sox | 38 | 01/06/2004 | Lynn | USA | Left | Right | 6' 1" | 200 lbs | $32,800,000 |
| Ordóñez, Cisco | C | Chicago (N) Cubs | 16 | 08/03/2025 | Havana | CUB | Right | Right | 6' 1" | 190 lbs | - |
| Organ, Garrick | RP | Free Agent | 16 | 12/04/2025 | San Diego | USA | Right | Right | 6' 2" | 180 lbs | - |
| Orozco, Augusto | SS | Free Agent | 15 | 09/29/2026 | Arlington | USA | Right | Right | 6' 2" | 170 lbs | - |
| Orozco, José | 2B | New York (A) Yankees | 18 | 07/25/2023 | Cabimas | VEN | Left | Right | 6' 1" | 185 lbs | - |
| Orozco, José | SP | New York (N) Mets | 18 | 07/04/2023 | Los Hidalgos | DOM | Left | Left | 6' 0" | 170 lbs | - |
| Orozco, Juan | LF | Free Agent | 21 | 07/28/2020 | Brooklyn Park | USA | Left | Right | 5' 10" | 180 lbs | - |
| Orr, Jerry | LF | Free Agent | 20 | 04/17/2022 | Springfield | USA | Left | Left | 6' 2" | 200 lbs | - |
| Ortega, Augusto | SP | Cleveland Guardians | 19 | 06/26/2022 | Santo Domingo | DOM | Switch | Right | 6' 8" | 205 lbs | - |
| Ortega, Jesús | SP | Free Agent | 19 | 09/18/2022 | Bowling Green | USA | Right | Right | 6' 2" | 170 lbs | - |
| Ortega, Jorge | SP | Oakland Athletics | 18 | 04/25/2024 | Santo Domingo | DOM | Left | Left | 6' 4" | 185 lbs | - |
| Ortega, Juan | SP | Free Agent | 17 | 11/03/2024 | San Juan | PUR | Right | Right | 6' 2" | 185 lbs | - |
| Ortega, Sergio | SP | Baltimore Orioles | 19 | 09/06/2022 | Las Matas de Santa Cruz | DOM | Switch | Right | 6' 2" | 185 lbs | - |
| Ortíz, Bobby | SP | Free Agent | 22 | 02/26/2020 | Rochester | USA | Left | Left | 6' 1" | 190 lbs | - |
| Ortíz, Doménico | RP | Free Agent | 16 | 05/23/2025 | San Diego | USA | Left | Left | 5' 9" | 155 lbs | - |
| Ortíz, Elián | CF | Free Agent | 28 | 03/18/2014 | Santo Domingo | DOM | Left | Left | 5' 11" | 180 lbs | - |
| Ortíz, Jesús | 2B | Free Agent | 17 | 12/07/2024 | Kenosha | USA | Switch | Right | 6' 1" | 185 lbs | - |
| Ortíz, Joaquín | C | Texas Rangers | 28 | 07/15/2013 | Santa Cruz | USA | Right | Right | 6' 6" | 205 lbs | $750,000 |
| Ortíz, Juan Carlos | 2B | Toronto Blue Jays | 18 | 03/24/2024 | El Vigía | VEN | Right | Right | 5' 11" | 165 lbs | - |
| Ortíz, Raúl | 1B | Minnesota Twins | 18 | 07/30/2023 | Burica | PAN | Left | Left | 6' 5" | 210 lbs | - |
| Ortíz, Raúl | SP | Free Agent | 18 | 07/15/2023 | Hamilton | USA | Left | Right | 6' 0" | 160 lbs | - |
| Ortíz, Sergio | SS | Free Agent | 17 | 06/18/2024 | Brooklyn | USA | Right | Right | 6' 1" | 165 lbs | - |
| Oruostege, Jody | SS | Free Agent | 17 | 11/18/2024 | North Las Vegas | USA | Right | Right | 6' 0" | 160 lbs | - |
| Osborn, Alex | SP | Free Agent | 17 | 12/06/2024 | Goose Creek | USA | Left | Left | 6' 0" | 165 lbs | - |
| Osborn, Tim | C | Free Agent | 21 | 05/26/2020 | Punta Gorda | USA | Right | Right | 6' 0" | 205 lbs | - |
| Osborne, Chuck | SP | Free Agent | 21 | 05/13/2020 | Griffin | USA | Left | Left | 6' 1" | 185 lbs | - |
| Osborne, Kevin | RP | Free Agent | 27 | 11/20/2014 | Akron | USA | Switch | Right | 6' 8" | 200 lbs | - |
| Osborne, Steve | CF | Free Agent | 18 | 06/30/2023 | Fayetteville | USA | Left | Right | 6' 5" | 190 lbs | - |
| Ostrom, Luke | 1B | Free Agent | 15 | 06/18/2026 | Kamloops | CAN | Left | Left | 6' 2" | 190 lbs | - |
| Ostrozinska, Bob | SP | Free Agent | 19 | 10/17/2022 | Boise | USA | Right | Right | 6' 4" | 190 lbs | - |
| Otero, César | 3B | Chicago (A) White Sox | 27 | 09/14/2014 | Caracas | VEN | Right | Right | 6' 2" | 200 lbs | $750,000 |
| Otero, Mario | SP | Free Agent | 21 | 10/12/2020 | Baltimore | USA | Right | Right | 6' 4" | 200 lbs | - |
| Outhwaite, Andy | RP | Free Agent | 17 | 04/21/2025 | Casas Adobes | USA | Left | Left | 6' 2" | 170 lbs | - |
| Owens, Chris | SP | Free Agent | 18 | 04/21/2024 | Savannah | USA | Right | Right | 6' 6" | 190 lbs | - |
| Owens, Kevin | C | Free Agent | 19 | 09/19/2022 | Hollywood | USA | Right | Right | 6' 0" | 195 lbs | - |
| Owens, Noel | SP | Free Agent | 18 | 12/20/2023 | Collins | USA | Right | Right | 6' 8" | 200 lbs | - |
| Owens, Sam | RP | Toronto Blue Jays | 33 | 06/20/2008 | Marion | USA | Right | Right | 6' 4" | 200 lbs | $2,800,000 |
