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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Brien, Kerwin | C | Free Agent | 26 | 07/22/1989 | Calgary | CAN | Right | Right | 5' 11" | 184 lbs | - |
| O'Dwyer, Mackenzie | 1B | Free Agent | 23 | 05/26/1992 | Kitimat | CAN | Right | Left | 6' 1" | 200 lbs | - |
| O'Leary, Bernie | 3B | Victoria Capitals | 20 | 03/03/1995 | Calgary | CAN | Right | Right | 6' 5" | 200 lbs | - |
| O'Neil, Jerry | 3B | Free Agent | 17 | 08/05/1998 | Gatineau | CAN | Left | Right | 5' 8" | 195 lbs | - |
| O'Neill, Myles | LF | Free Agent | 17 | 12/07/1998 | Ottawa | CAN | Right | Right | 6' 0" | 155 lbs | - |
| O'Neill, Paul | MR | Free Agent | 33 | 05/11/1982 | Kangerdlinerk | CAN | Right | Right | 6' 1" | 189 lbs | - |
| Oger, Daniel | CF | Free Agent | 33 | 03/19/1982 | Chapais | CAN | Right | Right | 5' 11" | 217 lbs | - |
| Ohler, Larry | 1B | Niagara Stars | 32 | 11/21/1983 | Blainville | CAN | Left | Left | 6' 4" | 255 lbs | - |
| Olivier, Mickael | RF | Free Agent | 20 | 04/30/1995 | Saskatoon | CAN | Right | Right | 6' 1" | 170 lbs | - |
| Ormon, Leif | SP | Free Agent | 22 | 01/24/1993 | Laval | CAN | Switch | Right | 6' 0" | 185 lbs | - |
| Orr, Jonathan | 3B | Free Agent | 30 | 09/06/1985 | Ottawa | CAN | Right | Right | 6' 3" | 207 lbs | - |
| Osborn, Pete | RF | Trois-Rivieres Saints | 30 | 04/22/1985 | Farnham | CAN | Left | Left | 6' 2" | 190 lbs | - |
| Osmond, Aydan | RF | Free Agent | 25 | 01/12/1990 | Abbotsford | CAN | Left | Left | 6' 3" | 227 lbs | - |
| Otto, Al | LF | Victoria Capitals | 20 | 12/18/1995 | Edmonton | CAN | Right | Right | 6' 3" | 190 lbs | - |
