| Name | Last Run |
|---|---|
| Originator | Fairview, 04-Aug-25 |
| Origintrail | Hamilton, 30-Sep-24 |
| Orihime | Chantilly, 26-Nov-22 |
| ORIHIME | Ballarat, 08-Mar-12 |
| Orikhan | Ascot, 25-Oct-14 |
| Oriko D'elegance | Kawasaki, 16-Oct-25 |
| Oriko El Dorado | Mombetsu, 27-Aug-25 |
| Oriko King | Kawasaki, 10-Jul-25 |
| Oriko Paradise | Kawasaki, 22-Aug-25 |
| Orinoco Flow | Donald, 04-Jul-15 |
| Orinoco Flow | Chepstow, 30-Oct-24 |
| Orio Al Serio | Niigata, 31-Aug-25 |
| Oriole | Dundalk, 01-Nov-25 |
| Oriole Way | Saratoga, 23-Aug-25 |
| Orion | Ladbrokes Pioneer Park, 15-Apr-17 |
| Orion Alpha | Seoul, 12-Aug-23 |
| Orion Class | Marseille-borely, 31-Oct-25 |
| Orion Heart | Nagoya, 17-Oct-25 |
| Orion Love | Royal Randwick, 17-Oct-15 |
| Orion Nebula | Chukyo, 04-Dec-22 |
| Orion Queen | Saint-Cloud, 26-Oct-25 |
| Orion Rock | Angers, 02-Nov-25 |
| Orion Spirit | Hipodromo Chile, 29-Oct-23 |
| Orion The Hunter | Darwin, 04-Oct-25 |
| Orion's Belt | Newmarket, 27-Sep-25 |
| Orioncaleyjags | Aintree, 08-Nov-25 |
| Orionids | Sha Tin, 08-Jun-19 |
| Orionis | Salisbury, 14-Aug-25 |
| Orionus | Orange, 11-Feb-23 |
| Oriskany | Hobart, 06-Jul-25 |
| Orisson | Toulouse, 11-Oct-25 |
| Oristana | Goulburn, 13-Feb-15 |
| Oristano | Geraldton, 17-Nov-24 |
| Orizzonte | Churchill Downs, 11-May-25 |
| Orizzonti | Hipodromo Chile, 02-Mar-25 |
| Orkan | Marseille-borely, 14-Jun-24 |
| Orkney Blue | Ayr, 25-Feb-25 |
| Orkney Lad | Bunbury, 04-Nov-25 |
| Orkos | Niigata, 27-Oct-24 |
| Orlabent | Werribee, 10-Jan-25 |
| Orland | Horseshoe Indianapolis, 12-Sep-25 |
| Orlanda | Wangaratta, 20-Feb-12 |
| Orlando De Bonas | Toulouse, 28-May-24 |
| Orlando Grove | Sportsbet-Wangaratta, 30-Dec-22 |
| Orlando Magic | Wolverhampton, 19-Feb-25 |
| Orlando Spirit | Down Royal, 31-Aug-24 |
| Orlando's Bride | Flemington, 08-Jun-13 |
| Orlas' Abbey | Wetherby, 26-Jan-23 |
| Orleans | Port Lincoln, 13-Oct-21 |
| Orleans Belle | Otaki, 26-Jul-25 |
| Orleans Rock | Grafton, 11-Sep-23 |
| Orleans Storm | Thistledown, 14-Aug-24 |
| Orleans Tourist | Fair Grounds, 22-Dec-24 |
| Orlhena | ParisLongchamp, 14-Sep-25 |
| Orlock Point | Punchestown, 16-Jan-23 |
| Orloff | |
| Orlov | Trentham, 17-May-25 |
| Orlova | Balaklava, 10-Sep-25 |
| Orlovka | Nancy, 18-Oct-25 |
| Orly | Toulouse, 23-Jun-25 |