| Registered Name | Owner / Club | Status |
|---|---|---|
| Ive Got To Be Frank | Shane Cowley Winterdown | Approved |
| Ivo II (GB) | Charlotte Younghusband Boru's | Approved |
| Ivy Bridge Polo | Kathleen Feerick Barnacarroll | Approved |
| Ivys Darla | Darcie Roche Thomastown and District | Approved |
| J Dixie Chick | Aoife Scallan Headfort | Approved |
| J Mc Andy | Michael McHugh Donegal Gaeltacht | Approved |
| J Picasso De Maibelle | Rory O'Sullivan Hennessy Warrington | Approved |
| J Vianney | Dermot Mc Cooey Mullaghmore | Approved |
| J.R. Mixed Cream | Elizabeth Higgins Burren | Approved |
| Jack and Jones | Jim Brown Castle Leslie | Approved |
| Jack Daniels (SWB) | Marie Sterner Corrib | Approved |
| Jack Daniels II | Briege Laura Farrelly Ard Lu | Approved |
| Jack In The Box | Ryan McBride Donegal Gaeltacht | Approved |
| Jack L | Jill Ladley Long Acre | Approved |
| Jack of Cloonagh | Jean Hourigan Abbeylands | Approved |