This is the list of all people with a lastname starting with "O" that we currently track in the category Sports, Rugby.
| Sean O'Brien | Donncha O'Callaghan | Paul O'Connell |
| James O'Connor | Brian O'Driscoll | Ronan O'Gara |
| Sean O'Loughlin | Martin Offiah | Nigel Owens |
| Ken Owens |