| Name | Last Run |
|---|---|
| Oranguclang | Bathurst, 27-Sep-10 |
| Oranjemund | Fairview, 05-Sep-25 |
| Oranmore | Bellewstown, 05-Jul-24 |
| Orano | Palermo, 14-Nov-23 |
| Orantorio Rose | Leinster, 18-Oct-25 |
| Oranzona | Dundalk, 11-Oct-25 |
| Oraqua | Geelong, 02-Oct-25 |
| Orarari Gold | Turffontein, 04-Mar-23 |
| Orarion | Nagoya, 28-Oct-25 |
| Orashi | Penn National, 02-Mar-24 |
| Orasky | Albany, 19-Jan-20 |
| Orastario | Bunbury, 01-May-14 |
| Orasun | Sale, 17-Jan-13 |
| Oratia Beauty | Ellerslie, 04-Nov-25 |
| Oratini | Port Augusta, 12-Aug-18 |
| Orator | Belmont At The Big A, 06-Oct-25 |
| Oratorical | Nottingham, 23-Oct-25 |
| Oratorio De L Aube | Dieppe, 09-Aug-25 |
| Oratorio Lass | Bunbury, 26-Jan-11 |
| Oratorio Storm | Geraldton, 03-Jan-13 |
| Oratorio's Pride | Broome, 19-Aug-17 |
| Oratorium | Ascot, 17-Dec-14 |
| Oratory Glory | Turf Paradise, 11-Apr-24 |
| Oratry | Mackay, 26-Nov-15 |
| Oraui Kkum | Busan, 29-Sep-24 |
| Oraylly | Newcastle, 08-Apr-17 |
| Orazia | Club Hipico Santiago, 17-May-25 |
| Orazio | Ascot, 06-Sep-25 |
| Orazio | Albury, 11-Dec-21 |
| Orazio | Hipodromo Chile, 08-Dec-24 |
| Orazio | Presque Isle Downs, 16-Oct-24 |
| Orb Alpha | Gulfstream, 02-Nov-25 |
| Orb And Sceptre | Kokura, 26-Aug-23 |
| Orb Of The Boro | Churchill Downs, 13-Sep-25 |
| Orb Run | Funabashi, 06-Feb-24 |
| Orb's Party Girl | Delaware Park, 08-Aug-24 |
| Orbaan | Wolverhampton, 04-Nov-25 |
| Orbaline | Penn National, 09-Mar-24 |
| Orbec | Wyong, 02-Sep-16 |
| Orbette | Mountaineer, 25-Sep-23 |
| Orbi One | Horseshoe Indianapolis, 08-Aug-25 |
| Orbison Roy | Landor, 30-Sep-24 |
| Orbisyn | Doomben, 30-Dec-23 |
| ORBIT | Coonabarabran, 09-Feb-13 |
| Orbit | Sunshine Coast Poly, 11-Aug-24 |
| Orbit | Gulfstream, 27-Oct-25 |
| Orbit Express | Caulfield, 26-Jan-13 |
| Orbit Mars | Mahoning Valley, 20-Dec-24 |
| Orbit Of Iolite | Huntingdon, 09-Nov-22 |
| Orbital | Newcastle, 18-Dec-24 |
| Orbital Chime | Wolverhampton, 26-Oct-25 |
| Orbital Express | The Valley, 26-Aug-23 |
| Orbital Miss | Gold Coast, 21-Oct-09 |
| Orbital Motion | Bordertown, 07-Feb-16 |
| Orbital Sander | Cluden Park, 17-Nov-07 |
| Orbital Speed | Kempsey, 26-Nov-22 |
| Orbital Starr | Fairmount Park, 11-Jun-25 |
| Orbiting | Port Lincoln, 13-Nov-20 |
| Orbiting Beauty | Zia Park, 14-Nov-23 |
| Orbiting Belle | Flemington, 01-Nov-11 |