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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Brien, Merrill | CF | Free Agent | 26 | 07/23/1989 | Little Rock | USA | Right | Right | 5' 11" | 185 lbs | - |
| O'Neil, Robert | 1B | Bronx Bombers | 29 | 01/25/1986 | Rock Island | USA | Left | Left | 6' 2" | 232 lbs | - |
| O'Sullivan, Dan | MR | El Paso Diablos | 26 | 12/21/1989 | Adrian | USA | Left | Left | 6' 0" | 190 lbs | - |
| O'Toole, Emory | MR | Springfield Reformers | 25 | 06/27/1990 | Dunlap | USA | Right | Right | 6' 2" | 195 lbs | - |
| Ochoa, Jesús | 2B | Minneapolis Freeze | 26 | 06/04/1989 | Sacramento | USA | Right | Right | 5' 11" | 155 lbs | - |
| Oglethorpe, Tony | RF | Billings Mustangs | 23 | 01/13/1992 | Manhattan | USA | Left | Left | 6' 2" | 200 lbs | - |
| Ohayashi, Takahashi | LF | Mdewanketon Sabercats | 25 | 06/20/1990 | Kawasaki | JPN | Right | Right | 6' 2" | 205 lbs | - |
| Okamoto, Michihiro | CF | Fort Worth Cats | 21 | 06/01/1994 | Kitakami | JPN | Right | Left | 6' 0" | 205 lbs | - |
| Olivares, Carlos | MR | Billings Mustangs | 24 | 10/19/1991 | Sabana Grande de Boya | DOM | Right | Right | 6' 6" | 185 lbs | - |
| Oliver, Wesley | MR | Indian Wells Aeropostales | 32 | 12/25/1983 | State College | USA | Left | Left | 6' 0" | 178 lbs | - |
| Omori, Shimei | 1B | Minneapolis Freeze | 25 | 04/07/1990 | Okazaki | JPN | Left | Left | 6' 2" | 220 lbs | - |
| Ortega, Andrés | SS | Albuquerque Cacti | 23 | 04/05/1992 | Flint | USA | Right | Right | 6' 0" | 215 lbs | - |
| Ortíz, José | MR | Leningrad Communists | 26 | 08/10/1989 | Maracaibo | VEN | Right | Left | 6' 2" | 215 lbs | - |
| Osborn, Dave | LF | Springfield Reformers | 22 | 01/14/1993 | Fabens | USA | Left | Left | 6' 0" | 180 lbs | - |
| Osborne, Robert | SP | Astoria Argonauts | 24 | 05/25/1991 | Kansas City | USA | Left | Left | 6' 4" | 210 lbs | - |
| Otero, Eduardo | RF | Pasadena Bumblebees | 24 | 08/08/1991 | Mayagüez | PUR | Left | Left | 6' 3" | 220 lbs | - |
| Owens, Mike | MR | El Paso Diablos | 24 | 02/25/1991 | Brooklyn | USA | Switch | Left | 6' 0" | 175 lbs | - |
| Oyama, Kata | CF | Mdewanketon Sabercats | 24 | 08/06/1991 | Kisogawa | JPN | Left | Right | 6' 1" | 160 lbs | - |
