| 12/31/2015 | ||||||
 |
|
| O |
| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Bryan, Ken | 1B | Free Agent | 27 | 02/26/1988 | Roland | USA | Left | Right | 6' 5" | 221 lbs | - |
| O'Donnell, Reese | 1B | Spokane Bulldogs | 25 | 06/10/1990 | Akron | USA | Right | Right | 6' 1" | 190 lbs | - |
| O'Halloran, Tom | SP | Long Island Ducks | 23 | 03/02/1992 | Fairfax | USA | Right | Right | 5' 11" | 195 lbs | - |
| O'Herlihy, Tim | CL | Cincinnati Snaps | 22 | 09/09/1993 | Lowell | USA | Right | Right | 5' 10" | 220 lbs | - |
| O'Quinn, Carl | SP | Silicon Valley Hackers | 24 | 09/24/1991 | Natchez | USA | Right | Right | 6' 3" | 235 lbs | - |
| Ochoa, Pancho | MR | Long Island Ducks | 24 | 04/23/1991 | Chicago | USA | Right | Right | 6' 2" | 220 lbs | - |
| Ogawa, Hiroji | 1B | New York Ninjas | 21 | 07/15/1994 | Komatsu | JPN | Right | Right | 6' 1" | 165 lbs | - |
| Ohayashi, Kojuro | 1B | San Antonio Storm Troopers | 21 | 09/30/1994 | Niigata | JPN | Left | Right | 6' 0" | 185 lbs | - |
| Ohayashi, Tatsukichi | CF | Prussian Marxists | 21 | 07/03/1994 | Mino | JPN | Right | Left | 6' 1" | 205 lbs | - |
| Okabe, Yoshino | C | Grand Haven Whitecaps | 22 | 04/08/1993 | Mito | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Okada, Masayuki | MR | Lake of the Isles Wolves | 22 | 04/10/1993 | Kobe | JPN | Right | Right | 6' 1" | 195 lbs | - |
| Oliver, Harumi | 3B | Blackpool Gamblers | 22 | 09/22/1993 | Visalia | USA | Right | Right | 6' 1" | 185 lbs | - |
| Olson, Denny | LF | San Antonio Storm Troopers | 28 | 11/17/1987 | Statesboro | USA | Right | Right | 6' 3" | 180 lbs | - |
| Onishi, Katsumi | CL | Newark Jail Birds | 21 | 10/19/1994 | Kawasaki | JPN | Switch | Right | 6' 5" | 205 lbs | - |
| Ono, Yasujiro | CL | Lake of the Isles Wolves | 22 | 03/02/1993 | New York | USA | Right | Right | 6' 0" | 200 lbs | - |
| Ortíz, Ernesto | MR | San Antonio Storm Troopers | 26 | 04/19/1989 | Rogers | USA | Right | Right | 6' 7" | 210 lbs | - |
| Ortíz, José | MR | Lake of the Isles Wolves | 25 | 10/03/1990 | Kokomo | USA | Left | Left | 6' 1" | 210 lbs | - |
| Ortíz, Pedro | MR | Anniston Cougars | 23 | 11/04/1992 | Calumet City | USA | Left | Left | 5' 9" | 190 lbs | - |
| Ortíz, Sergio | SP | Blackpool Gamblers | 21 | 12/11/1994 | Yabucoa | PUR | Left | Left | 5' 11" | 260 lbs | - |
| Osborne, Paul | RF | Free Agent | 25 | 08/23/1990 | Huntington Beach | USA | Left | Left | 6' 2" | 185 lbs | - |
| Oswald, Chris | 3B | Wichita Wolverines | 26 | 09/20/1989 | Plainfield | USA | Right | Right | 6' 0" | 179 lbs | - |
| Otsuka, Tsukasa | SS | Anniston Cougars | 24 | 06/13/1991 | Suzuka | JPN | Right | Right | 5' 10" | 170 lbs | - |
| Owen, Woody | SP | Newark Jail Birds | 24 | 09/13/1991 | Bella Vista | USA | Right | Right | 6' 0" | 210 lbs | - |
| Owens, Jacob | MR | Spokane Bulldogs | 22 | 12/14/1993 | Mayflower Village | USA | Left | Left | 6' 1" | 225 lbs | - |
| Owens, Keith | MR | Free Agent | 29 | 12/29/1986 | West Peoria | USA | Switch | Right | 6' 1" | 193 lbs | - |
