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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Brien, Dylan | 3B | Trois-Rivieres Saints | 21 | 08/29/1995 | London | CAN | Right | Right | 6' 1" | 215 lbs | - |
| O'Brien, Eddie | MR | Free Agent | 34 | 12/31/1982 | Montreal | CAN | Right | Right | 5' 11" | 210 lbs | - |
| O'Brien, Kerwin | C | Free Agent | 27 | 07/22/1989 | Calgary | CAN | Right | Right | 5' 11" | 184 lbs | - |
| O'Connor, Scott | RF | Montreal Royales | 18 | 08/27/1998 | Thetford Mines | CAN | Left | Left | 5' 11" | 205 lbs | - |
| O'Dwyer, Ed | C | Kelowna Heat | 21 | 12/02/1995 | Surrey | CAN | Left | Right | 6' 3" | 230 lbs | - |
| O'Dwyer, Mackenzie | 1B | Free Agent | 24 | 05/26/1992 | Kitimat | CAN | Right | Left | 6' 1" | 196 lbs | - |
| O'Leary, Bernie | CF | Free Agent | 21 | 03/03/1995 | Calgary | CAN | Right | Right | 6' 5" | 200 lbs | - |
| O'Neill, Paul | MR | Free Agent | 34 | 05/11/1982 | Kangerdlinerk | CAN | Right | Right | 6' 1" | 187 lbs | - |
| Oakes, Scott | 1B | Victoria Capitals | 23 | 08/24/1993 | Toronto | CAN | Right | Right | 6' 0" | 200 lbs | - |
| Ohler, Larry | 1B | Free Agent | 33 | 11/21/1983 | Blainville | CAN | Left | Left | 6' 4" | 253 lbs | - |
| Oldford, Bill | LF | Montreal Royales | 21 | 01/05/1995 | Kingston | CAN | Right | Right | 6' 5" | 190 lbs | - |
| Oliver, Jeffrey | CF | Montreal Royales | 25 | 09/21/1991 | Toronto | CAN | Left | Left | 6' 0" | 205 lbs | - |
| Olivier, Mickael | RF | Free Agent | 21 | 04/30/1995 | Saskatoon | CAN | Right | Right | 6' 1" | 170 lbs | - |
| Ong, Hang-fu | MR | Calgary Outlaws | 28 | 06/28/1988 | Toronto | CAN | Switch | Right | 6' 0" | 190 lbs | - |
| Organ, Brandon | SS | Trois-Rivieres Saints | 18 | 09/18/1998 | Toronto | CAN | Switch | Right | 6' 1" | 190 lbs | - |
| Ormon, Dean | MR | Free Agent | 27 | 08/14/1989 | Brossard | CAN | Right | Right | 5' 11" | 205 lbs | - |
| Orr, Jonathan | 3B | Free Agent | 31 | 09/06/1985 | Ottawa | CAN | Right | Right | 6' 3" | 207 lbs | - |
| Osborn, Jason | CF | Calgary Outlaws | 36 | 10/08/1980 | Quebec | CAN | Right | Right | 6' 2" | 205 lbs | - |
| Osmond, Aydan | RF | Free Agent | 26 | 01/12/1990 | Abbotsford | CAN | Left | Left | 6' 3" | 231 lbs | - |
| Ostrom, Rich | RF | London Monarchs | 25 | 05/21/1991 | Toronto | CAN | Right | Left | 6' 6" | 212 lbs | - |
| Otto, Al | LF | Free Agent | 21 | 12/18/1995 | Edmonton | CAN | Right | Right | 6' 3" | 190 lbs | - |
| Ouyang, Fei | 1B | Calgary Outlaws | 27 | 01/21/1989 | Caledon | CAN | Switch | Right | 6' 3" | 200 lbs | - |
| Ouyang, Szeto | MR | Trois-Rivieres Saints | 23 | 08/27/1993 | Norfolk County | CAN | Right | Right | 6' 0" | 210 lbs | - |
