| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Yorktown | chestnut | c | 1957 | Battlefield | Joodles | Thoroughbred | USA | |
| Yorkville Belle | chestnut | f | 1889 | Thora | Thoroughbred | USA | ||
| Yorten | bay | c | 2017 | 0734-4 Storm Shelter | 2962-5 Fantaisiste | Thoroughbred | Mr. Nirov A.V. | |
| Yoshida | bay | c | 2014 | Heart's Cry | Hilda's Passion | Thoroughbred | Iaponiia | |
| Yota | bay | f | 2023 | 643090000617745 | 1644-7 Amerikos | 6155-7 Zena | Thoroughbred | Malkinsk Stud |
| You All | bay | f | 1968 | Nashua | Honey Dear | Thoroughbred | USA | |
| You and I | d.-bay | c | 1991 | Kris S | La Chaposa | Thoroughbred | USA | |
| You Call That Art | bay | f | 2003 | Royal Academy | Support the Arts | Thoroughbred | USA | |
| You Don't Love Me | bay | f | 2009 | Teofilo | Alleluia | Thoroughbred | Ireland | |
| 3479-5 You Live and Learn | chestnut | f | 2003 | 985101022061472 | Galileo | Anniversary | Thoroughbred | Great Britain |