| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Thelus | chestnut | f | 1916 | Thoroughbred | France | |||
| Theme Song | bay | f | 1967 | Nearctic | Victory Chant | Thoroughbred | ||
| Themesong | chestnut | f | 1935 | High Time | Thoroughbred | USA | ||
| Theodora | chestnut | f | 1943 | Prince Rose | Aziyade | Thoroughbred | France | |
| 366 Theodora ex Vert | bay | f | 1925 | Verwood | Thelus | Thoroughbred | France | |
| Theodore | c | 1883 | Thoroughbred | Great Britain | ||||
| Theodosia | bay | f | 1881 | Thoroughbred | France | |||
| 2019-4 Theologicum | bay | f | 2003 | 985101024062686 | King's Best | Valnerina | Thoroughbred | Great Britain |
| Theon | br. | c | 1837 | Emilius | Thoroughbred | Great Britain | ||
| Theophania | bay | f | 1800 | Thoroughbred | Great Britain |