| Registered Name | Owner / Club | Status |
|---|---|---|
| Cosmic Click | Emily Vial Clonshire | Approved |
| Cosmic Rolo | Sharon McKeever Castle Leslie | Approved |
| Cossack | Martha Reid Calliaghstown | Approved |
| Costa Is Ainm Dom | Ali Murray Brooke Lodge | Approved |
| Costa Klover | Rena Ryan Newpark | Approved |
| Costaweefortune (IRE) | Claudia Culloty Clonshire | Approved |
| Cottage Taffetta Blue | Susan O'Connor Gap of the North | Approved |
| Cotterstown Blue | Barbara Maguire Mosstown | Approved |
| Cotterstown Captain | Antonia Gordon Clonmel | Approved |
| Cotterstown Casper | Patricia Molloy Thomastown and District | Approved |
| Cotterstown Dancer | Patricia Molloy Thomastown and District | Approved |
| Cotterstown Levie | Sinead Fenton Mosstown | Approved |
| Cougar Jasper | Lucinda Creighton Winterdown | Approved |
| Cougarlu | Caitriona O'Meara Mo Chara | Approved |
| Could Be Lucky | Linda Maher Warrington | Approved |