Horses in United States
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| Name | Last Run |
|---|---|
| Ornellaia | Saratoga, 03-Aug-25 |
| Ornery Angel | Fairmount Park, 01-Oct-25 |
| Ornery As Hell | Will Rogers Downs, 10-May-23 |
| Oro | Canterbury Park, 18-Aug-25 |
| Oro Azteca | Fonner Park, 27-Apr-25 |
| Oro De Moro Moro | Mountaineer Park, 21-Oct-24 |
| Oro Oro | Gulfstream, 01-Sep-24 |
| Oro Oscuro | Charles Town, 17-Aug-24 |
| Oro Roso | Tampa Bay Downs, 01-Jan-26 |
| Orocovix | Charles Town, 06-Jul-24 |
| Orozimba | Turfway Park, 06-Feb-26 |
| Orphan Exchange | Presque Isle Downs, 15-Oct-24 |
| Orphan Hallie | Woodbine, 14-Dec-24 |
| Orquidea Real | Gulfstream, 15-Dec-25 |
| Orsa Bella | Mahoning Valley, 22-Jan-26 |
| Ortelius | Leopardstown, 12-May-24 |
| Orth | Turf Paradise, 11-Nov-25 |
| Ortho Star | Churchill Downs, 27-Jun-25 |
| Orts Dream | Will Rogers Downs, 03-May-23 |
| Ortus | Saratoga, 22-Aug-25 |
| Orville B | Mahoning Valley, 06-Feb-26 |
| Orville's Map | Fair Grounds, 02-Feb-26 |
| Osa | Laurel Park, 24-Nov-25 |
| Osage Creek | Santa Anita, 15-Jun-25 |
| Osage Express | Will Rogers Downs, 14-Jan-26 |
| Osage Josy | Remington Park, 30-May-25 |
| Osbaldo Lucky Boy | Zia Park, 17-Nov-25 |
| Osbaldoperfection | Turf Paradise, 09-Dec-25 |
| Osbin | Mountaineer, 10-Jul-25 |
| Osbourne | Churchill Downs, 04-May-25 |
| Oscar Award | Gulfstream, 10-Dec-23 |
| Oscar Bound | Gulfstream, 06-Feb-26 |
| Oscar Brave | Hanshin, 09-Dec-23 |
| Oscar D | Horseshoe Indianapolis, 10-Sep-25 |
| Oscar Eclipse | Oaklawn Park, 06-Feb-26 |
| Oscar Gaze | Delaware Park, 23-May-25 |
| Oscar Joy | Woodbine, 30-May-25 |
| Oscar Mike | Horseshoe Indianapolis, 04-Jun-25 |
| Oscar Night | Zia Park, 29-Nov-25 |
| Oscar Nominee | Fairmount Park, 27-Aug-25 |
| Oscar Production | Turf Paradise, 02-Jan-26 |
| Oscar Season | Fair Grounds, 28-Nov-25 |
| Oscar Winner | Colonial Downs, 19-Jul-24 |
| Oscar's Encore | Kentucky Downs, 01-Sep-25 |
| Oscar's Hope | Oaklawn Park, 04-Jan-26 |
| Oscar's World | Gulfstream, 30-Mar-25 |
| Oscargot | Keeneland, 25-Apr-25 |
| Oscars Angel | Gulfstream, 20-Oct-25 |
| Oscarsson | Presque Isle Downs, 06-Aug-25 |
| Oscarworthy | Gulfstream, 06-Apr-25 |
| Oscor | Charles Town, 23-Nov-25 |
| Oshala | Gulfstream, 30-Jan-26 |
| Oskee Wow Wow | Gulfstream, 05-Feb-23 |
| Oslo Queen | Nakayama, 05-Jan-26 |
| Oso | Charles Town, 14-Nov-25 |
| Oso Pollitical | Zia Park, 17-Nov-25 |
| Osprey | Tampa Bay Downs, 29-Jan-26 |
| Osterville Public | Fair Grounds, 14-Feb-24 |
| Ostracism | Woodbine, 25-Nov-23 |
| Ostracize | Hastings Racecourse, 30-Sep-24 |