| Registered Name | Owner / Club | Status |
|---|---|---|
| Casper The Friendly Cob | Jessica Sinnott Thomastown and District | Approved |
| Caspian (SWB) | Olivia Smiddy Highland Lodge | Approved |
| Caspin | Nuala Lowney Williams West Cork | Approved |
| Casrlwterry (IRE) | Romi Buhles Kerry | Approved |
| Cassai-RG | Kerry McTeggart Border Counties | Approved |
| Cassanovas Diamond | Lisa Doran Moyglare | Approved |
| Cassiniki | Emer O'Reilly Calliaghstown | Approved |
| Cassino Lass | Katy Scott Kerry | Approved |
| Cassy Free | Margaret Corry Burren | Approved |
| Casta Fiore | Marie Claire Van Hout Mill Road | Approved |
| Castana Diva | Amanda Lambe Abbeylands | Approved |
| Castanetta Mirah | Katherine O'Brien Benbulben | Approved |
| Castilo Van t' Vrombautshof Z | Brian Tuffy Nephin | Approved |
| Castle Cool Clover | Brian Byrne Rock of Cashel | Approved |
| Castle Crest Pandora | Geraldine McCann Meath | Approved |