| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Yawkey Way | d.-bay | f | 2008 | Grand Slam | Is Kylie Good | Thoroughbred | USA | |
| Yay Go Me | d.-bay | f | 2007 | Songandaprayer | Alaska Queen | Thoroughbred | USA | |
| Yazda | bay | f | 1897 | Graf-Yanovskij | Doucereuse | Thoroughbred | ||
| Yeah Nah | bay | f | 2021 | 985101045349706 | Kodiac | Anything Goes | Thoroughbred | Tally-Ho Stud |
| Yeats | bay | c | 2001 | Sadler's Wells | Lyndonville | Thoroughbred | Ireland | |
| Yel Etpes | bay | c | 2025 | 900255002419542 | 1281-6 Velikiy Zevs | 7084-8 Aysunny | Thoroughbred | Iskakov Muratali Akhmedzanovich |
| Yell | d.-bay | f | 2000 | A.P. Indy | Wild Applause | Thoroughbred | USA | |
| Yellow and Black | f | 1929 | Laland | Thoroughbred | ||||
| Yellow Blossom | chestnut | f | 1918 | Luke McLuke | Micaela | Thoroughbred | USA | |
| Yellow Boat | bay | f | 2009 | Lemon Drop Kid | Wye River | Thoroughbred | USA |