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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Brien, Tommy | MR | Williamsport Crosscutters | 28 | 09/23/1981 | New York | USA | Left | Left | 6' 0" | 218 lbs | - |
| O'Day, Mark | MR | Lowell Spinners | 19 | 11/08/1990 | New York | USA | Left | Left | 6' 5" | 240 lbs | - |
| Ochoa, Rafael | SP | Staten Island Yankees | 27 | 03/24/1983 | San Antonio | USA | Right | Right | 6' 0" | 172 lbs | - |
| Oglethorpe, Carl | MR | Hudson Valley Renegades | 20 | 09/08/1989 | Carthage | USA | Left | Left | 6' 5" | 225 lbs | - |
| Ornelas, José | SP | Mahoning Valley Scrappers | 20 | 06/04/1990 | Carolina | PUR | Right | Right | 5' 11" | 190 lbs | - |
| Osler, Howard | RF | Lowell Spinners | 18 | 10/10/1991 | Elkhart | USA | Left | Left | 5' 9" | 190 lbs | - |
| Owen, Ed | LF | Tri-City ValleyCats | 23 | 06/09/1987 | Orland Park | USA | Left | Left | 6' 1" | 200 lbs | - |
