| Registered Name | Owner / Club | Status |
|---|---|---|
| Joltin Joe Dimaggio | Patricia Newman Mosstown | Approved |
| Jon James | Orla Clarke Cheval | Approved |
| Jonny Smith | Ruth Hegarty Drynam | Approved |
| Jordanstown Lights | Laura Beasley Killossery | Approved |
| Jordanstown Rocket | Trisha Gallagher Cheval | Approved |
| Josaprem Lady | Sorcha Sheehy Round Tower | Approved |
| Josephs Bailey | Michele Bowbrick Castle Hill | Approved |
| Journey Man | Myles McGowan Benbulben | Approved |
| Joxers Lot | Ailish Ryan Mo Chara | Approved |
| Joyful Jamie | Linda Hannon Lismore | Approved |
| JR Trooper | Orla Curry Coole Lane | Approved |
| JT Legoland | Avena O'Keefe East Cork | Approved |
| JTK Indoctro Diamond | Jo Penfold Lisduff | Approved |
| Juan Amigo | Ciara Kelly Castledermot | Approved |
| Juan De Reves | Lorraine Kelly Castledermot | Approved |