| Name | Last Run |
|---|---|
| Opera Plage | Kokura, 20-Jul-25 |
| Opera Point | Clonmel, 24-Oct-25 |
| Opera Show | Pinjarra Park, 04-Sep-14 |
| Opera Singer | ParisLongchamp, 15-Sep-24 |
| Opera Swing | Fairview, 16-Jul-24 |
| Opera Verse | Fairview, 01-Oct-25 |
| Opera Wave | Newmarket, 31-Oct-25 |
| Operata | San Isidro, 02-Feb-25 |
| Operate | Brighton, 26-Jun-24 |
| Operatic Artist | Lingfield, 25-Nov-23 |
| OPERATIC STORY | |
| Operation | Tatura, 05-Jul-11 |
| Operation | Kawasaki, 12-Jun-23 |
| Operation Dynamo | TRIAL Rosehill Gardens, 21-Oct-22 |
| Operation Fast | York, 26-Sep-10 |
| Operation Gimcrack | Newcastle, 18-Oct-25 |
| OPERATION LEFTFOOT | Kalgoorlie, 16-Aug-09 |
| Operation Manna | Sandown, 07-Dec-24 |
| Operation Overlord | Carlisle, 08-Apr-23 |
| Operation Overlord | Belmont At The Big A, 06-Oct-25 |
| Operation Sunrise | Keeneland, 10-Oct-25 |
| Operation Tiger | Singapore, 28-Sep-24 |
| Operation Torch | Colonial Downs, 10-Aug-25 |
| Operation Twist | Warrnambool, 01-May-14 |
| Operational | Carnarvon, 12-Aug-17 |
| Operatnthunderbolt | Gulfstream, 19-May-25 |
| Operator | Sonoda, 27-Jun-25 |
| Operator Please | Geraldton, 13-Apr-10 |
| Operatore Pazzo | Churchill Downs, 07-Nov-24 |
| Operazione | Ohi, 20-May-25 |
| Operistico | San Isidro, 22-May-25 |
| Opernball | Chukyo, 08-Dec-24 |
| Ophelia | Nagoya, 12-Apr-24 |
| Ophelia | Tauranga, 18-Oct-23 |
| Ophelia Blues | Port Augusta, 07-May-21 |
| Ophelia Grace | Wolverhampton, 04-Nov-25 |
| Ophelia's Knight | Rockhampton, 22-May-18 |
| Ophelias Dream | Penn National, 21-Nov-24 |
| Ophidian | Swan Hill, 15-Mar-13 |
| Ophira | Valparaiso Sporting Club, 06-Feb-25 |
| Opi Daqui | Compiegne, 10-Oct-25 |
| Opiana | Chantilly, 08-Jul-25 |
| Opicina | Sportsbet-Ballarat Synthetic, 26-Nov-22 |
| Opie The Giant | Racing.com Park, 20-Feb-20 |
| Opie's Girl | Mahoning Valley, 29-Jan-25 |
| Opinion Leader | Kawasaki, 05-Aug-25 |
| Opinionated | Laurel Park, 17-Dec-23 |
| Opinions | Mackay, 25-Nov-22 |
| OPIO MISS | |
| Opito Ballerina | Toowoomba, 07-Jun-25 |
| Opium Craf | Monterrico, 08-Oct-23 |
| Opium Rim | |
| Oplontis | Toulouse, 20-Mar-25 |
| Opoho Dreaming | Wagga, 18-Jan-22 |
| OPOSITIVE | |
| Oppa | Grafton, 28-Oct-25 |
| Oppa | Singapore, 04-Aug-24 |
| Oppenheimer | Avondale, 06-Nov-25 |
| Oppenheimer | Curragh, 09-Aug-25 |
| Oppenheimer | Townsville, 17-Jan-19 |