| Registered Name | Owner / Club | Status |
|---|---|---|
| Conquestador | Sarah Lang Thomastown and District | Approved |
| Consular Assistance | Camilla Beirne Meath | Approved |
| Convincing | Barbara Curran Earl's Well | Approved |
| Convoys Bernies Delight | Corinna Gilsenan Tara Hill | Approved |
| Coober Pedy | Aisling McGrath Corrib | Approved |
| Cooga Lady | Rachel Barton Three Counties | Approved |
| Coogee Sonny | Sarah Jane Weissenbach Thomastown and District | Approved |
| Cookie Can | John Whelan Carne | Approved |
| Cookie Crumbles | Michelle O' Reilly Mullingar | Approved |
| Cookie Dough | Unknown | Approved |
| Cookie of Fortune | Erin Fergus Stracomer | Approved |
| Cookies Moon Light | Jillian Cooper Barnacarroll | Approved |
| Cookstown Duchess | Carol Ann O' Neill Barrow Valley | Approved |
| Cool Blue Milly | Laura Cornett Castle Leslie | Approved |
| Cool Cavatina | Orla Owens Mosstown | Approved |