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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Brian, Pat | 2B | Free Agent | 26 | 05/24/1989 | Trent Woods | USA | Right | Right | 6' 0" | 206 lbs | - |
| O'Connor, Leonard | 2B | Free Agent | 25 | 01/26/1990 | Brooklyn | USA | Right | Right | 6' 0" | 175 lbs | - |
| O'Cornyn, Ralph | RF | Free Agent | 26 | 09/16/1989 | Tucson | USA | Left | Left | 6' 3" | 243 lbs | - |
| O'Day, Jaime | C | Huntsville Sabercats | 22 | 06/05/1993 | Holyoke | USA | Right | Right | 6' 5" | 220 lbs | - |
| O'Farrell, Eric | MR | Las Vegas Lost | 23 | 08/11/1992 | Sapulpa | USA | Right | Right | 5' 10" | 195 lbs | - |
| O'Higgins, Dan | LF | Free Agent | 28 | 09/02/1987 | Framingham | USA | Right | Right | 6' 0" | 185 lbs | - |
| O'Mulvey, Ron | LF | Free Agent | 25 | 11/10/1990 | Richmond Heights | USA | Left | Left | 6' 3" | 190 lbs | - |
| O'Neal, Joe | RF | Free Agent | 27 | 08/01/1988 | Corralitos | USA | Left | Left | 6' 6" | 218 lbs | - |
| O'Neil, Clayton | SP | Chippewa River Chiefs | 22 | 08/11/1993 | Iselin | USA | Right | Right | 6' 0" | 255 lbs | - |
| O'Quinn, Edward | LF | Free Agent | 25 | 09/02/1990 | Chicago | USA | Right | Left | 6' 3" | 230 lbs | - |
| Ochoa, Juan | CF | Free Agent | 27 | 07/08/1988 | Las Cruces | USA | Right | Right | 6' 2" | 146 lbs | - |
| Oger, Joël | 3B | Chippewa River Chiefs | 25 | 05/21/1990 | Toronto | CAN | Right | Right | 6' 2" | 165 lbs | - |
| Oglethorpe, Bryant | CL | Cherry Hill Stealers | 24 | 03/12/1991 | Scottdale | USA | Left | Left | 6' 7" | 210 lbs | - |
| Ohashi, Sekien | SS | Huntsville Sabercats | 24 | 08/22/1991 | Koshoku | JPN | Right | Right | 6' 1" | 170 lbs | - |
| Ohayashi, Hideki | SP | New Orleans Jedi Knights | 23 | 01/27/1992 | Habikino | JPN | Switch | Right | 5' 11" | 200 lbs | - |
| Ohayashi, Masu | CF | Bethesda Hornets | 30 | 10/25/1985 | Inagawa | JPN | Left | Left | 6' 0" | 188 lbs | - |
| Ohayashi, Matsu | RF | Houston Sting | 34 | 09/23/1981 | Hirakata | JPN | Left | Left | 6' 0" | 211 lbs | - |
| Ohayashi, Shirai | SP | Dearborn Pioneers | 20 | 12/21/1995 | Nara | JPN | Right | Right | 5' 10" | 210 lbs | - |
| Oike, Shuncho | 3B | Bethesda Hornets | 34 | 02/27/1981 | Funabashi | JPN | Right | Right | 6' 2" | 218 lbs | - |
| Ojeda, Carlos | CL | Kingwood Knights | 21 | 09/02/1994 | Levittown | PUR | Right | Right | 6' 2" | 225 lbs | - |
| Okamura, Toshikazu | CF | Free Agent | 32 | 07/08/1983 | Kobe | JPN | Left | Left | 6' 0" | 183 lbs | - |
| Okumura, Izumo | MR | Roman Fascists | 20 | 04/17/1995 | Tokyo | JPN | Right | Right | 6' 8" | 245 lbs | - |
| Oliuo, Luis | SS | Free Agent | 26 | 06/26/1989 | Central Falls | USA | Right | Right | 6' 0" | 230 lbs | - |
| Olson, Aaron | 1B | Houston Sting | 22 | 05/09/1993 | Baltimore | USA | Right | Right | 6' 5" | 215 lbs | - |
| Olson, Eric | CF | Free Agent | 26 | 09/22/1989 | Ridgeland | USA | Right | Right | 6' 0" | 220 lbs | - |
| Olson, Wayne | LF | Penzance Pirates | 21 | 02/15/1994 | Chevy Chase | USA | Left | Right | 6' 5" | 160 lbs | - |
| Olvera, Guillermo | LF | Penzance Pirates | 21 | 12/27/1994 | Trinidad | CRC | Right | Right | 6' 0" | 220 lbs | - |
| Onishi, Hirohisa | SP | Free Agent | 20 | 10/03/1995 | Fuchu | JPN | Right | Right | 6' 1" | 210 lbs | - |
| Onishi, Takao | SP | Chippewa River Chiefs | 20 | 03/10/1995 | Sapporo | JPN | Right | Right | 5' 9" | 215 lbs | - |
| Onishi, Yasukazu | LF | Westside Road Warriors | 19 | 07/22/1996 | Suzuka | JPN | Right | Right | 6' 3" | 185 lbs | - |
| Ono, Tsurayuki | SP | Bel Air Princes | 23 | 10/08/1992 | Ichinomiya | JPN | Right | Right | 6' 5" | 215 lbs | - |
| Oram, Rick | MR | Penzance Pirates | 20 | 11/06/1995 | Montreal | CAN | Right | Left | 6' 2" | 180 lbs | - |
| Orozco, Adrián | MR | Roman Fascists | 23 | 12/16/1992 | West Valley City | USA | Right | Right | 6' 3" | 225 lbs | - |
| Ortega, Eduardo | CL | Dearborn Pioneers | 19 | 06/18/1996 | Guayama | PUR | Right | Right | 5' 11" | 210 lbs | - |
| Ortíz, Adrián | 1B | Coney Island Cyclones | 22 | 11/02/1993 | Newport Beach | USA | Right | Right | 6' 2" | 215 lbs | - |
| Ortíz, Dani | CF | Free Agent | 27 | 11/08/1988 | Esperanza | DOM | Right | Right | 6' 3" | 224 lbs | - |
| Ortíz, Félix | SP | Huntsville Sabercats | 22 | 05/15/1993 | New York | USA | Left | Left | 6' 2" | 200 lbs | - |
| Ortíz, Jorge | SP | Westside Road Warriors | 20 | 08/11/1995 | Carrizal | VEN | Left | Left | 6' 0" | 200 lbs | - |
| Ortíz, Juan | SP | St. Paul Saints | 19 | 06/30/1996 | Ponce | PUR | Right | Right | 5' 10" | 245 lbs | - |
| Ortíz, Orlando | C | Bethesda Hornets | 20 | 10/01/1995 | Nueva Paz | CUB | Right | Right | 6' 3" | 205 lbs | - |
| Ortíz, Raúl | MR | Free Agent | 27 | 10/01/1988 | Charleston | USA | Right | Right | 6' 1" | 214 lbs | - |
| Orton, Conrad | CL | Nichols Gnats | 20 | 03/25/1995 | Ottawa | CAN | Right | Right | 6' 0" | 225 lbs | - |
| Orton, Don | CF | Roman Fascists | 19 | 03/30/1996 | Trois-Rivičres | CAN | Right | Right | 6' 1" | 195 lbs | - |
| Osburn, Harold | MR | Huntsville Sabercats | 24 | 01/16/1991 | Deltona | USA | Left | Left | 6' 0" | 200 lbs | - |
| Oshima, Junji | LF | Free Agent | 20 | 03/04/1995 | Ichinomiya | JPN | Left | Left | 6' 1" | 185 lbs | - |
| Oshima, Motoyuki | MR | Free Agent | 20 | 02/14/1995 | Hasuda | JPN | Right | Right | 6' 1" | 225 lbs | - |
| Osorio, José | 1B | Free Agent | 26 | 04/05/1989 | Lawrence | USA | Left | Right | 6' 2" | 225 lbs | - |
| Otero, Vicente | CL | Coney Island Cyclones | 19 | 05/29/1996 | Guantanamo | CUB | Left | Left | 5' 9" | 210 lbs | - |
| Ottaway, Quentin | LF | Bethesda Hornets | 26 | 01/09/1989 | Perth | AUS | Left | Left | 6' 1" | 195 lbs | - |
| Owen, Dan | LF | Huntsville Sabercats | 23 | 10/11/1992 | Philadelphia | USA | Switch | Right | 6' 0" | 210 lbs | - |
| Owens, Nathan | MR | Barrow Frosties | 20 | 05/11/1995 | Edmonton | CAN | Left | Left | 6' 3" | 230 lbs | - |
| Oyama, Shunso | MR | Huntsville Sabercats | 24 | 09/16/1991 | Yamato | JPN | Left | Left | 6' 7" | 220 lbs | - |
