| Name | Position | Party | Constituency |
|---|---|---|---|
| Tom O’Neill | Councillor | Fine Gael | Carlow |
| Louise O’Reilly | TD | Sinn Féin | Dublin Fingal |
| TP O’Reilly | Councillor | Fine Gael | Ballyjamesduff |
| Pauline O’Reilly | Senator | Green Party | Labour Panel |
| Colm O’Rourke | Councillor | Unknown | Cabra - Glasnevin |
| Tony O’Shea | Ceann Comhairle | Unknown | Mallow |
| Peter Ormond | Councillor | Fianna Fáil | Birr |
| Jackser Owens | Councillor | Independent | Enniscorthy |
| Danny Owens | Councillor | Fianna Fáil | Tullamore |