| Stallions Registered - Past and Present | DOWNLOAD an Application to Register or Update a Stallion |
| If you have a stallion on this list, please contact us to update information and so we can ensure our contact details are up to date. |
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| O | Stud ID | Born | Colour | Breed | NZSH Registr. | Sire | Last known location |
| OKIWA NUI | 198 | | 1992 | SKW | Paint Horse | NZPP 92-217 | WHETUNUI | Okiwa Stud |
| OLDENBURG | 99 | | 1973 | GR | Dutch Warmblood | DUTC 72-986 | INSCHALLAH | Charlton Stud |
| OMARU CAROUSO | 139 | | 1990 | BAY | Andalusian | ANDL 90-079 | MARINO |
| OMARU FARINO | 161 | | 1987 | GR | ANDL 87-030 | MARINO | Hanna Andalusians |
| OSBERTON GOLIATH | 45 | | 1972 | BAY | Cleveland Bay | CLBY 71-691 | FOREST SUPERMAN | Wetherby/Huntclyffe Stud |
| OTAUA STORM FORCE | 188 | | 1992 | BR | Thoroughbred | NZTB 92-006 | ABERLOU | White Horse Farm |
| OTTO | 261 | | NZTB xx-998 |