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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Day, Tom | SP | Birmingham Bobcats | 23 | 11/25/1993 | South Amherst | USA | Right | Left | 6' 1" | 215 lbs | - |
| O'Donnell, Reese | 2B | Billings Mustangs | 26 | 06/10/1990 | Akron | USA | Right | Right | 6' 1" | 190 lbs | - |
| O'Farrell, Eric | MR | Springfield Reformers | 24 | 08/11/1992 | Sapulpa | USA | Right | Right | 5' 10" | 195 lbs | - |
| O'Halloran, Tom | SP | Bronx Bombers | 24 | 03/02/1992 | Fairfax | USA | Right | Right | 5' 11" | 193 lbs | - |
| O'Herlihy, Tim | CL | Minneapolis Freeze | 23 | 09/09/1993 | Lowell | USA | Right | Right | 5' 10" | 220 lbs | - |
| O'Neil, Robert | 1B | Bronx Bombers | 30 | 01/25/1986 | Rock Island | USA | Left | Left | 6' 2" | 234 lbs | - |
| O'Neill, Jayson | C | Bronx Bombers | 29 | 04/04/1987 | Spanish Springs | USA | Right | Right | 6' 2" | 197 lbs | $1,000,000 |
| O'Quinn, Carl | SP | Albuquerque Cacti | 25 | 09/24/1991 | Natchez | USA | Right | Right | 6' 3" | 235 lbs | - |
| O'Reilly, Foster | C | Acapulco Banditos | 28 | 04/21/1988 | Millersville | USA | Switch | Right | 6' 0" | 203 lbs | - |
| O'Sullivan, Dan | MR | El Paso Diablos | 27 | 12/21/1989 | Adrian | USA | Left | Left | 6' 0" | 190 lbs | - |
| Oglethorpe, Tony | RF | Billings Mustangs | 24 | 01/13/1992 | Manhattan | USA | Left | Left | 6' 2" | 200 lbs | - |
| Ohayashi, Hideki | MR | Detroit Death Stars | 24 | 01/27/1992 | Habikino | JPN | Switch | Right | 5' 11" | 200 lbs | - |
| Ohayashi, Kojuro | 3B | Detroit Death Stars | 22 | 09/30/1994 | Niigata | JPN | Left | Right | 6' 0" | 185 lbs | - |
| Okabe, Yoshino | C | St. John Stingrays | 23 | 04/08/1993 | Mito | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Okada, Masayuki | MR | Mdewanketon Sabercats | 23 | 04/10/1993 | Kobe | JPN | Right | Right | 6' 1" | 195 lbs | - |
| Olivares, Carlos | MR | Springfield Reformers | 25 | 10/19/1991 | Sabana Grande de Boya | DOM | Right | Right | 6' 6" | 185 lbs | - |
| Oliver, Wesley | MR | Free Agent | 33 | 12/25/1983 | State College | USA | Left | Left | 6' 0" | 182 lbs | - |
| Olson, Dave | RF | Free Agent | 31 | 07/25/1985 | New York | USA | Right | Right | 6' 0" | 208 lbs | - |
| Omori, Shimei | 1B | Minneapolis Freeze | 26 | 04/07/1990 | Okazaki | JPN | Left | Left | 6' 2" | 220 lbs | - |
| Onishi, Katsumi | CL | Acapulco Banditos | 22 | 10/19/1994 | Kawasaki | JPN | Switch | Right | 6' 5" | 205 lbs | - |
| Ono, Yasujiro | CL | Mdewanketon Sabercats | 23 | 03/02/1993 | New York | USA | Right | Right | 6' 0" | 200 lbs | - |
| Ornelas, Pedro | 2B | Fort Worth Cats | 26 | 06/30/1990 | Valencia | VEN | Right | Right | 6' 2" | 180 lbs | - |
| Ortega, Andrés | SS | Albuquerque Cacti | 24 | 04/05/1992 | Flint | USA | Right | Right | 6' 0" | 215 lbs | - |
| Ortíz, Orlando | C | Coronado Phantoms | 21 | 10/01/1995 | Nueva Paz | CUB | Right | Right | 6' 3" | 205 lbs | - |
| Otsuka, Tsukasa | SS | Birmingham Bobcats | 25 | 06/13/1991 | Suzuka | JPN | Right | Right | 5' 10" | 170 lbs | - |
| Owen, Dan | LF | Birmingham Bobcats | 24 | 10/11/1992 | Philadelphia | USA | Switch | Right | 6' 0" | 212 lbs | - |
| Owen, Woody | SP | Acapulco Banditos | 25 | 09/13/1991 | Bella Vista | USA | Right | Right | 6' 0" | 210 lbs | - |
| Owens, Mike | MR | Free Agent | 25 | 02/25/1991 | Brooklyn | USA | Switch | Left | 6' 0" | 175 lbs | - |
