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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Brien, Merrill | CF | Free Agent | 25 | 07/23/1989 | Little Rock | USA | Right | Right | 5' 11" | 185 lbs | - |
| O'Callahan, Bennett | C | Free Agent | 27 | 05/10/1987 | Winslow | USA | Right | Right | 6' 3" | 185 lbs | - |
| O'Higgins, Reese | 2B | Mdewanketon Sabercats | 24 | 06/29/1990 | Rialto | USA | Right | Right | 5' 8" | 175 lbs | - |
| O'Neil, Robert | LF | Bronx Bombers | 28 | 01/25/1986 | Rock Island | USA | Left | Left | 6' 2" | 230 lbs | - |
| O'Neil, Steve | RF | Free Agent | 33 | 06/21/1981 | Montreal | CAN | Right | Left | 6' 2" | 211 lbs | - |
| O'Sullivan, Dan | MR | El Paso Diablos | 25 | 12/21/1989 | Adrian | USA | Left | Left | 6' 0" | 190 lbs | - |
| Ochoa, Jesús | 2B | Minneapolis Freeze | 25 | 06/04/1989 | Sacramento | USA | Right | Right | 5' 11" | 155 lbs | - |
| Ogura, Jun'ichi | SS | Birmingham Bobcats | 22 | 02/28/1992 | Motegi | JPN | Right | Right | 6' 0" | 180 lbs | - |
| Ohayashi, Takahashi | LF | Mdewanketon Sabercats | 24 | 06/20/1990 | Kawasaki | JPN | Right | Right | 6' 2" | 205 lbs | - |
| Okada, Tsumemasa | MR | Billings Mustangs | 36 | 02/04/1978 | Ube | JPN | Switch | Left | 6' 0" | 212 lbs | - |
| Olivares, Carlos | MR | Billings Mustangs | 23 | 10/19/1991 | Sabana Grande de Boya | DOM | Right | Right | 6' 6" | 185 lbs | - |
| Oliver, Wesley | MR | Free Agent | 31 | 12/25/1983 | State College | USA | Left | Left | 6' 0" | 178 lbs | - |
| Olson, Denny | CF | Detroit Death Stars | 27 | 11/17/1987 | Statesboro | USA | Right | Right | 6' 3" | 180 lbs | - |
| Ornelas, Pedro | 2B | Fort Worth Cats | 24 | 06/30/1990 | Valencia | VEN | Right | Right | 6' 2" | 180 lbs | - |
| Ortíz, José | MR | Leningrad Communists | 25 | 08/10/1989 | Maracaibo | VEN | Right | Left | 6' 2" | 215 lbs | - |
| Ortíz, Pedro | MR | Birmingham Bobcats | 22 | 11/04/1992 | Calumet City | USA | Left | Left | 5' 9" | 190 lbs | - |
| Osborne, Jake | MR | Free Agent | 27 | 05/14/1987 | Los Angeles | USA | Left | Left | 6' 5" | 188 lbs | - |
| Otero, Eduardo | RF | Pasadena Bumblebees | 23 | 08/08/1991 | Mayagüez | PUR | Left | Left | 6' 3" | 220 lbs | - |
| Owens, Mike | MR | El Paso Diablos | 23 | 02/25/1991 | Brooklyn | USA | Switch | Left | 6' 0" | 175 lbs | - |
