| Registered Name | Owner / Club | Status |
|---|---|---|
| O Dee De Lux | Seamus Heverin Nephin | Approved |
| O Jardin Du Pressoir | Susan Murray Drynam | Approved |
| O' Loughlins Girl | Hilary Mc Gettigan Letterkenny | Approved |
| O'Donovan Rossa (IRE) | Michelle Gazely Clonmel | Approved |
| Oak Park Clover | Kieran Cahill Thomastown and District | Approved |
| Oakfield Yogi Bear | Jacqueline Murphy Warrington | Approved |
| Oakhill Tia Maria | Keith Jamieson Hollybrook | Approved |
| Oakland Little T | Meabh Hennessy Boru's | Approved |
| Oakland Majestic | Elaine Allen Mullingar | Approved |
| Oakley Sam | Sharon Griffin Greenhills | Approved |
| Oakpark High Flyer | Kieran Cahill Thomastown and District | Approved |
| Oakport Clover Mcguire | Sheena Boran Calliaghstown | Approved |
| Oakport Furistos Star | Jennifer Burke Benbulben | Approved |
| Oakport Harvey Star | Kate Solon Greenhills | Approved |
| Oakport Mc Eneaney | Anita Algierowiicz Corrib | Approved |