| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Syntactic | bay | f | 1974 | Forward Pass | War Tide | Thoroughbred | USA | |
| Syonora | bay | f | 1907 | Santoi | Feu Follet | Thoroughbred | Great Britain | |
| Syphon | chestnut | c | 1750 | Squirt | Thoroughbred | Great Britain | ||
| Syracuse | bay | f | 1985 | Sharp-Eyed Quillo | Segesta | Thoroughbred | USA | |
| 3398-5 Syrdarya | chestnut | f | 2008 | 0458-4 Akbash | 0990-3 Strofa | Thoroughbred | Voskhod Stud | |
| Syrdarya | bay | f | 2025 | 643099001887884 | 1599-7 Steewen Slew | 5090-7 Alenta | Thoroughbred | Rodnik Farm |
| Syrdon | d.-bay | c | 1977 | 3099 Sardar | 4038 Sofistika | Thoroughbred | Beslansk Stud | |
| Syria | chestnut | f | 1838 | Muley Moloch | Thoroughbred | Great Britain | ||
| Syria | d.-bay | f | 1978 | Damascus | Santiago Lassie | Thoroughbred | USA | |
| Syrian | chestnut | c | 1867 | Mentmore | Thoroughbred | Great Britain |