| Registered Name | Owner / Club | Status |
|---|---|---|
| Merlyn's Monty (IRE) | Mary Lang Benbulben | Approved |
| Mermus Hill | Elaine Wilson Benbulben | Approved |
| Merry Goes Round | Paul McDonald Nuenna Farm | Approved |
| Merry Wood | John Lidierth Russellstown | Approved |
| Merrycorner Lunar Lady | Louise Duffy Copperfield | Approved |
| Merryman | Marie Murray Mosstown | Approved |
| Merrymountain Sassella | Georgie Spain Dalysgrove | Approved |
| Merrywell Splash Of Clover | Sarah Jane Flanagan Howth | Approved |
| Merton Hall Lad | Tina Goodenough Friary | Approved |
| Merton Hall Lass | Tina Goodenough Friary | Approved |
| Messer Maguire | Jane Whelan Dunamase | Approved |
| Metal John | Lauren Morgan Abbeylands | Approved |
| Metalbridge Don | Katie Matthews Headfort | Approved |
| Metalbridge Joan | Joan Byrne Warrington | Approved |
| MGC Spinelli | JANE HANCOCK Russellstown | Approved |