| Name | Position | Party | Constituency |
|---|---|---|---|
| John Coonan | Councillor | Fianna Fáil | Kilkenny |
| Noel Coonan | Former Representative | Fine Gael | |
| Noel Coonan | Former Representative | Unknown | |
| Donna Cooney | Councillor | Green Party | Clontarf |
| Donna Cooney | Former Representative | Unknown | |
| Joe Cooney | Councillor | Fine Gael | Killaloe |
| Freddie Cooper | Councillor | Unknown | Blanchardstown - Mulhuddart |
| Eugene Coppinger | Former Representative | Solidarity | |
| Ruth Coppinger | Former Representative | Solidarity | |
| Donal Corcoran | Former Representative | Renua Ireland | |
| Marcella Corcoran Kennedy | Former Representative | Fine Gael | |
| Edel Corrigan | Councillor | Sinn Féin | Dundalk Carlingford |
| Melanie Corrigan | Councillor | Unknown | Bray West |
| Nessa Cosgrove | Former Representative | Labour | |
| Joe Costello | Councillor | Labour | North Inner City |
| David Costello | Former Representative | Fianna Fáil | |
| Patrick Costello | Councillor | Green Party | Kimmage - Rathmines |
| Teresa Costello | Councillor | Fianna Fáil | Tallaght Central |
| John Costelloe | Councillor | Sinn Féin | Limerick City North |
| James Coughlan | Former Representative | Workers Party | |
| Martin Coughlan | Councillor | Unknown | Macroom |
| Gillian Coughlan | Councillor | Fianna Fáil | Bandon-Kinsale |
| Liam Coughlan | Former Representative | Aontú | |
| Nicky Coules | Former Representative | People Before Profit | |
| Simon Coveney | TD | Fine Gael | Cork South-Central |
| Barry Cowen | TD | Fianna Fáil | Laois-Offaly |
| Jerry Cowley | Former Representative | Independent | |
| Valerie Cox | Former Representative | Independent | |
| Maeve Cox | Former Representative | Independent | |
| Gerry Coyle | Councillor | Fine Gael | Belmullet |