| Registered Name | Owner / Club | Status |
|---|---|---|
| Themoonandsixpence (IRE) | Jemima Ripman Arderin | Approved |
| Theo (FR) | Sean Cooney Killcarrick | Approved |
| Theorem (GB) | Kate Nic A Bhaird Earl's Well | Approved |
| Theoretical Visibility | Julie Brett Thomastown and District | Approved |
| Theos Diamond | Maria Foy Annaharvey | Approved |
| Theseus R | Naomi Fisher Foxborough | Approved |
| Third Times A Charm | Cait Lynch Castledermot | Approved |
| Thisledome Pearl Mist | Joyce Morris Carrickmines | Approved |
| Thistletown Nordic Clover | Eleanor Wauchob Cill Dara | Approved |
| Thistletown Oldrock Cloe | Peter Dillon Killcarrick | Approved |
| Thistoshallpass (IRE) | Caroline Bellew Border Counties | Approved |
| Thomas | Graeme Power Waterford | Approved |
| Thomas Joseph | Nina Scott Slieve Bloom | Approved |
| Thomascourt Hula | Bernadette Flaherty Corrib | Approved |
| Thomastown Dolly | Ber Bourke Newpark | Approved |