| Registered Name | Owner / Club | Status |
|---|---|---|
| World Cup M (KWPN) | Helen Conlon Benbulben | Approved |
| Worldwalker | Laura Sheehan Killcarrick | Approved |
| Wormsley Glen Paddy | Sarah Jane Sinnott West Cork | Approved |
| Worsenden Neave | Lisa Kane Lakelands | Approved |
| Worth A Look (IRE) | Clodagh Watkins Kilrainy | Approved |
| Wots It To You | Martina Cunningham Springmount | Approved |
| Wrens High Roller | Lisa Conway Calliaghstown | Approved |
| WSF Mayflower | Kathleen Walsh Sarsfield | Approved |
| 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 |