Horses in United States
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| Name | Last Run |
|---|---|
| Osbin | Mountaineer, 10-Jul-25 |
| Osbourne | Churchill Downs, 22-Jun-26 |
| Oscar Award | Gulfstream, 10-Dec-23 |
| Oscar Bound | Saratoga, 04-Jul-26 |
| Oscar Brave | Hanshin, 09-Dec-23 |
| Oscar D | Horseshoe Indianapolis, 05-Jul-26 |
| Oscar Eclipse | Oaklawn Park, 26-Apr-26 |
| Oscar Gaze | Delaware Park, 23-May-25 |
| Oscar Joy | Woodbine, 30-May-25 |
| Oscar Mike | Horseshoe Indianapolis, 31-May-26 |
| Oscar Night | Sunray Park, 10-May-26 |
| Oscar Nominee | Fairmount Park, 27-Aug-25 |
| Oscar Production | Emerald Downs, 15-Jun-26 |
| Oscar Season | Fair Grounds, 28-Nov-25 |
| Oscar Winner | Colonial Downs, 19-Jul-24 |
| Oscar's Encore | Saratoga, 04-Jul-26 |
| Oscar's Hope | Churchill Downs, 29-Jun-26 |
| Oscar's World | Gulfstream, 30-Mar-25 |
| Oscargot | Keeneland, 25-Apr-25 |
| Oscars Angel | Gulfstream, 20-Jun-26 |
| Oscarsson | Presque Isle Downs, 06-Aug-25 |
| Oscarworthy | Gulfstream, 06-Apr-25 |
| Oscor | Charles Town, 28-Jun-26 |
| Oshala | Gulfstream, 18-Apr-26 |
| Osiris Law | Gulfstream, 25-May-26 |
| Osiris Whisper | Gulfstream, 22-Jun-26 |
| Oskee Wow Wow | Gulfstream, 05-Feb-23 |
| Oslo Queen | Fukushima, 26-Apr-26 |
| Oso | Charles Town, 07-Feb-26 |
| Oso De Oro | Churchill Downs, 31-May-26 |
| Oso Pollitical | Sunland Park, 28-Mar-26 |
| Oso Rapida | |
| Osprey | Mountaineer, 15-Apr-26 |
| Osterville Public | Fair Grounds, 14-Feb-24 |
| Ostracism | Woodbine, 25-Nov-23 |
| Ostracize | Hastings Racecourse, 30-Sep-24 |
| Ostrica | Fair Grounds, 29-Nov-25 |
| Oswald | Turf Paradise, 23-Apr-26 |
| Otago | Colonial Downs, 06-Jul-26 |
| Otanisan | Tokyo, 09-Feb-25 |
| Otello | Belmont At The Big A, 28-Jun-26 |
| Other Level | Gulfstream, 13-Jun-26 |
| Other Times | Will Rogers Downs, 11-May-23 |
| Otherbrotherdaryl | Sam Houston Race Park, 01-Mar-26 |
| Otherpeoplesmoney | Aqueduct, 13-Feb-26 |
| Otherworldly | Los Alamitos Racecourse, 01-Jun-26 |
| Otis On The Cape | Horseshoe Indianapolis, 25-Oct-24 |
| Otis Otis Otis | Thistledown, 17-Jun-26 |
| Otomena Shacho | Nakayama, 01-Mar-26 |
| Otoole Of The Nile | Remington Park, 13-Apr-26 |
| Otro Mas | Los Alamitos Racecourse, 29-Jun-26 |
| Ottawa | Woodbine, 16-Nov-24 |
| Otter Creek | Fonner Park, 25-Apr-26 |
| Otter Mischief | Philadelphia Park, 14-Jan-26 |
| Otter Pop | Assiniboia Downs, 17-Jul-24 |
| Ottinho | Saratoga, 07-Jun-26 |
| Ottis Betts | Santa Anita, 07-Jun-26 |
| Otto | Gulfstream, 14-Jul-25 |
| Otto Nipoti | Finger Lakes, 25-Jun-26 |
| Otto The Conqueror | Churchill Downs, 19-Jun-26 |