| Name | Position | Party | Constituency |
|---|---|---|---|
| Niall Ó Donnghaile | Senator | Sinn Féin | Administrative Panel |
| Séafra Ó Faoláin | Councillor | Unknown | Blackrock |
| Sean Ó Fearghail | TD | Fianna Fáil | Kildare South |
| John Shéamuis Ó Fearraig | Councillor | Sinn Féin | Glenties |
| Oisín Ó Halmhain | Former Representative | Green Party | |
| Donnchadh Ó Laoghaire | TD | Sinn Féin | Cork South-Central |
| Naoise Ó Muirí | Councillor | Fine Gael | Clontarf |
| Ruairí Ó Murchú | Councillor | Sinn Féin | Dundalk South |
| Labhrás Ó Murchú | Former Representative | Fianna Fáil | |
| Aodhán Ó Ríordáin | Senator | Labour | Industrial and Commercial Panel |
| Séana Ó Rodaigh | Councillor | Unknown | Balbriggan |
| Aengus Ó Snodaigh | TD | Sinn Féin | Dublin South-Central |
| Fionntán Ó Súilleabháin | Councillor | Sinn Féin | Gorey |
| Seán Ó Tuairisg | Former Representative | Fianna Fáil | |
| Niall Ó Tuathail | Former Representative | Social Democrats | |
| Gerry O'Boyle | Former Representative | Independent | |
| Gino O'Boyle | Councillor | People Before Profit Alliance | Sligo-Strandhill |
| Mary Ann O'Brien | Former Representative | Independent | |
| Danny O'Brien | Former Representative | Sinn Féin | |
| Ed O'Brien | Councillor | Fianna Fáil | Lucan |
| Emmett O'Brien | Councillor | Independent | Adare-Rathkeale |
| Michael O'Brien | Former Representative | Independent | |
| Shane O'Brien | Former Representative | Sinn Féin | |
| Peter O'Brien | Councillor | Labour | Dundrum |
| Tony O'Brien | Councillor | Fianna Fáil | Killaloe |
| Michael O'Brien | Former Representative | Solidarity | |
| Patsy O'Brien | Councillor | Fine Gael | Claremorris |
| Niamh O'Brien | Former Representative | Fís Nua | |
| Oliver O'Brien | Former Representative | Unknown | |
| Deirdre O'Brien | Councillor | Fianna Fáil | Fermoy |