| Registered Name | Owner / Club | Status |
|---|---|---|
| Oscar Oscar | Aine Bray Clonshire | Approved |
| Oscar Taylor | Trisha Freyne Moyglare | Approved |
| Oscar TBS | Carol Henley Winterdown | Approved |
| Oscar The Great | Paul Jordan Woodstown | Approved |
| Oscar The Star | Amie Barrett Castle Carraig | Approved |
| Oscar West | Damien Fitzgerald Kerry | Approved |
| Osh Atero | Dianne Kelly Ard Lu | Approved |
| Osier De Feron | Jane Foley Ahern Brooke Lodge | Approved |
| Osono | Michelle Davitt Dunbyrne | Approved |
| Otis Mac | Angela McStay Russellstown | Approved |
| Oulart Financial Bealtaine | Amie Gaffney Lisduff | Approved |
| Ould Son | Ailis Cullen Greenvalley | Approved |
| Our Big Ben | Tony Kelly Corrib | Approved |
| Our Black Diamond | Lorraine Bergin Mo Chara | Approved |
| Our Bonnie | Shawna Waters Enniskerry | Approved |