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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connell, Colin | C | Oakland Oaks | 26 | 12/14/2008 | Dublin | IRL | Right | Right | 6' 1" | 200 lbs | $1,375,000 |
| O'Neal, Tim | CF | Oakland Oaks | 27 | 09/10/2007 | Kansas City | USA | Left | Left | 6' 3" | 220 lbs | $280,000 |
| O'Toole, Ricky | RP | Panama City Piranhas | 28 | 11/22/2006 | Detroit | USA | Right | Right | 6' 0" | 195 lbs | $280,000 |
| Obregón, Gabriel | CF | Greenville 84s | 18 | 08/21/2016 | Puerto Armuelles | PAN | Left | Right | 6' 2" | 180 lbs | - |
| Ohayashi, Nobuhiko | CF | Kingston Township Knights | 18 | 11/06/2016 | Sakaiminato | JPN | Right | Right | 6' 0" | 175 lbs | - |
| Ohayashi, Taro | RP | Free Agent | 33 | 11/19/2001 | Kawachinagano | JPN | Right | Right | 6' 1" | 220 lbs | - |
| Oistrah, Romochka | SP | Kingston Township Knights | 16 | 08/15/2018 | Slyudyanka | RUS | Right | Left | 5' 10" | 155 lbs | - |
| Ooyendijk, Jaake | SP | Charleston Battery | 17 | 10/02/2017 | Sint Michiel | CUR | Right | Right | 6' 4" | 185 lbs | - |
| Oquendo, Marcos | RP | Charleston Battery | 29 | 05/29/2005 | Matamoros | MEX | Right | Right | 6' 0" | 200 lbs | $850,000 |
| Orser, Curt | RP | Echo Park Lakers | 27 | 11/21/2007 | New York | USA | Right | Right | 6' 2" | 210 lbs | $280,000 |
| Ortíz, Sergio | 3B | Panama City Piranhas | 32 | 07/19/2002 | Izúcar | MEX | Right | Right | 6' 0" | 200 lbs | $8,000,000 |
| Osterman, Jon | CF | Houston 1837 BBC | 27 | 09/26/2007 | Rammingen | GER | Right | Right | 6' 1" | 185 lbs | $10,000,000 |
| Owens, Mike | RP | Free Agent | 32 | 09/28/2002 | Coeur d'Alene | USA | Right | Left | 6' 7" | 265 lbs | - |
