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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Cullinan, Gene | 3B | Mt Pleasant Bearcats | 29 | 12/08/1989 | Arlington Heights | USA | Right | Right | 6' 1" | 193 lbs | - |
| O'Loan, Dave | 3B | Reading Rainbows | 23 | 04/22/1995 | San Diego | USA | Right | Right | 6' 0" | 200 lbs | - |
| Otterburn, Doyle | 3B | Butler White Sox | 24 | 07/04/1994 | Dunmore | USA | Left | Right | 6' 1" | 195 lbs | - |
| Ouakili, Gildun | SP | Newark Bulldogs | 30 | 04/27/1988 | Grabouw | RSA | Right | Right | 6' 0" | 215 lbs | - |
| Ouimet, Martin | MR | Free Agent | 30 | 01/17/1988 | Montreal | CAN | Left | Left | 6' 2" | 246 lbs | - |
