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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Bryan, Ken | 1B | Free Agent | 26 | 02/26/1988 | Roland | USA | Left | Right | 6' 5" | 215 lbs | - |
| O'Donnell, Reese | 1B | Free Agent | 24 | 06/10/1990 | Akron | USA | Right | Right | 6' 1" | 190 lbs | - |
| O'Halloran, Tom | SP | Long Island Ducks | 22 | 03/02/1992 | Fairfax | USA | Right | Right | 5' 11" | 195 lbs | - |
| O'Herlihy, Cary | LF | Free Agent | 29 | 01/01/1985 | Connersville | USA | Right | Right | 6' 1" | 152 lbs | - |
| O'Quinn, Carl | SP | Silicon Valley Hackers | 23 | 09/24/1991 | Natchez | USA | Right | Right | 6' 3" | 235 lbs | - |
| O'Toole, Emory | MR | Murfreesboro Deacons | 24 | 06/27/1990 | Dunlap | USA | Right | Right | 6' 2" | 195 lbs | - |
| Ochoa, Pancho | CL | Long Island Ducks | 23 | 04/23/1991 | Chicago | USA | Right | Right | 6' 2" | 220 lbs | - |
| Ohayashi, Kojuro | 1B | San Antonio Storm Troopers | 20 | 09/30/1994 | Niigata | JPN | Left | Right | 6' 0" | 185 lbs | - |
| Ohayashi, Tatsukichi | CF | Prussian Marxists | 20 | 07/03/1994 | Mino | JPN | Right | Left | 6' 1" | 205 lbs | - |
| Okabe, Yoshino | C | Grand Haven Whitecaps | 21 | 04/08/1993 | Mito | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Omori, Shimei | 1B | Cincinnati Snaps | 24 | 04/07/1990 | Okazaki | JPN | Left | Left | 6' 2" | 220 lbs | - |
| Ortega, Andrés | SS | Silicon Valley Hackers | 22 | 04/05/1992 | Flint | USA | Right | Right | 6' 0" | 215 lbs | - |
| Ortíz, Ernesto | MR | Free Agent | 25 | 04/19/1989 | Rogers | USA | Right | Right | 6' 7" | 210 lbs | - |
| Ortíz, José | MR | Lake of the Isles Wolves | 24 | 10/03/1990 | Kokomo | USA | Left | Left | 6' 1" | 210 lbs | - |
| Ortíz, Sergio | SP | Blackpool Gamblers | 20 | 12/11/1994 | Yabucoa | PUR | Left | Left | 5' 11" | 250 lbs | - |
| Osborne, George | 2B | Free Agent | 24 | 06/04/1990 | Waukesha | USA | Right | Right | 6' 1" | 190 lbs | - |
| Osborne, Paul | RF | Free Agent | 24 | 08/23/1990 | Huntington Beach | USA | Left | Left | 6' 2" | 185 lbs | - |
| Osborne, Robert | SP | Rock River Rats | 23 | 05/25/1991 | Kansas City | USA | Left | Left | 6' 4" | 210 lbs | - |
| Osburn, Harold | MR | Anniston Cougars | 23 | 01/16/1991 | Deltona | USA | Left | Left | 6' 0" | 200 lbs | - |
| Oswald, Chris | 3B | Wichita Wolverines | 25 | 09/20/1989 | Plainfield | USA | Right | Right | 6' 0" | 179 lbs | - |
| Owen, Woody | SP | Newark Jail Birds | 23 | 09/13/1991 | Bella Vista | USA | Right | Right | 6' 0" | 210 lbs | - |
| Owens, Keith | MR | Murfreesboro Deacons | 28 | 12/29/1986 | West Peoria | USA | Switch | Right | 6' 1" | 191 lbs | - |
| Oyama, Kata | CF | Lake of the Isles Wolves | 23 | 08/06/1991 | Kisogawa | JPN | Left | Right | 6' 1" | 160 lbs | - |
