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List of Ottawa RedBlacks “O” Players 2014–2018
| Name | Position | Regular GP | # of Seasons (Years) | Also played for |
| O'Brien, Danny | QB | 45 | 3 (2014–2016) | EDM |
| Omara, Ron | LB | 8 | 1 (2017) | BC, HAM |
| Oramasionwu, Don | DL | 0 | 1 (2018) | EDM, MTL, WPG |
| Orange, Anthony | DB | 2 | 1 (2017) | BC, TOR |
| “O” player count: 4 |