| Registered Name | Owner / Club | Status |
|---|---|---|
| Wuthering Heights | Sue Byrne Cheval | Approved |
| Wylene | Erin Fergus Stracomer | Approved |
| Xaviour Classic | Bibi Dunne Mullingar | Approved |
| Xena Diamond Warrior | Sharon Condren Castle Hill | Approved |
| Xena Lady | Doreen Byrne Broomfield | Approved |
| Xibit A | Amanda Florence Sheridan Headfort | Approved |
| Xtreme Cavalier | Vicky Farrell Ballyhyland | Approved |
| Yarraman (IRE) | Samantha Murphy South West | Approved |
| Yarrow Valley | Brigid Neill Thomastown and District | Approved |
| Yasmina V | Bernie Foley Cheval | Approved |
| Yeats County | Ken Lowry Springmount | Approved |
| Yeats' Duke-Box Jive | Emer Lawlor Moyglare | Approved |
| Yegua | Samantha Fitzsimons Calliaghstown | Approved |
| Yellowriver Diamond Dancer | Laura Bohan Mullingar | Approved |
| Yke | Shellie Murtagh Clonlara | Approved |