| Registered Name | Owner / Club | Status |
|---|---|---|
| Cyd | Rosaleen Smyth Donegal Gaeltacht | Approved |
| Cyrano 145 | Maeve Furlong Fingal | Approved |
| Cyrille | Claire Atkinson Ballycanew | Approved |
| Cyrkonia | Ian Shaw Round Tower | Approved |
| Cyruso H | Niamh Lawless Killcarrick | Approved |
| D Monty | Katie Stafford Carne | Approved |
| D'Acor | James Mowatt Horetown | Approved |
| D'arcy Roxy Girl | Johanna Brown Thomastown and District | Approved |
| D'Mullingarshuffle (GB) | Emily Taylor Mullingar | Approved |
| D-Sign | Tara Dalton Twinfort | Approved |
| D.T.S First Flight | Maura Walsh Tara Hill | Approved |
| Da Vinci Cody | Vanessa Lennon Tara Hill | Approved |
| Daddy Long Legs | Marnie Crerar Boyneside | Approved |
| Daddys Money | Ciara O' Sullivan Kenmare | Approved |
| Dads Choice | Chloe Hester Glenway | Approved |