Horses in United States
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| Name | Last Run |
|---|---|
| Oscar Joy | Woodbine, 30-May-25 |
| Oscar Mike | Horseshoe Indianapolis, 04-Jun-25 |
| Oscar Night | Sunland Park, 23-Feb-26 |
| Oscar Nominee | Fairmount Park, 27-Aug-25 |
| Oscar Production | Turf Paradise, 16-Apr-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 | Keeneland, 04-Apr-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, 18-Apr-26 |
| Oshala | Gulfstream, 18-Apr-26 |
| Oskee Wow Wow | Gulfstream, 05-Feb-23 |
| Oslo Queen | Nakayama, 05-Jan-26 |
| Oso | Charles Town, 07-Feb-26 |
| Oso De Oro | Gulfstream, 19-Apr-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 | Turfway Park, 28-Feb-26 |
| Otanisan | Tokyo, 09-Feb-25 |
| Otello | Aqueduct, 05-Apr-26 |
| Other Level | Gulfstream, 18-Apr-26 |
| Other Times | Will Rogers Downs, 11-May-23 |
| Otherbrotherdaryl | Sam Houston Race Park, 01-Mar-26 |
| Otherpeoplesmoney | Aqueduct, 13-Feb-26 |
| Otis On The Cape | Horseshoe Indianapolis, 25-Oct-24 |
| Otis Otis Otis | Mahoning Valley, 09-Dec-25 |
| Otomena Shacho | Nakayama, 01-Mar-26 |
| Otoole Of The Nile | Remington Park, 13-Apr-26 |
| Otro Mas | Santa Anita, 06-Apr-26 |
| Ottawa | Woodbine, 16-Nov-24 |
| Otter Creek | Fonner Park, 20-Apr-26 |
| Otter Mischief | Philadelphia Park, 14-Jan-26 |
| Otter Pop | Assiniboia Downs, 17-Jul-24 |
| Ottinho | Keeneland, 05-Apr-26 |
| Ottis Betts | Santa Anita, 21-Mar-26 |
| Otto | Gulfstream, 14-Jul-25 |
| Otto Nipoti | Tampa Bay Downs, 17-Jan-26 |
| Otto The Conqueror | Oaklawn Park, 19-Apr-26 |
| Otto's Magic | Santa Anita, 01-Mar-26 |
| Ottoman Empire | Sunray Park, 19-May-25 |
| Otts Moore | Lone Star Park, 26-Oct-25 |
| Otzelberger | Turfway Park, 05-Mar-26 |
| Ou La La | Santa Anita, 21-Mar-26 |
| Oubabe | Santa Anita, 23-Feb-26 |
| Oubliette | Turfway Park, 26-Mar-26 |
| Ouch Charlie | Fair Grounds, 03-Feb-25 |
| Ouch Ouch Ouch | Penn National, 09-Aug-23 |
| Ouch That Hurt | Finger Lakes, 09-Oct-25 |
| Oughta B |