| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| 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 | |||
| Theoretically | d.-bay | f | 1997 | Theatrical | Aspern | Thoroughbred | USA | |
| Thepartyneverends | bay | f | 2012 | Smart Strike | Clay's Rocket | Thoroughbred | USA | |
| Thepleasureisreal | chestnut | f | 1983 | What a Pleasure | Inreality Star | Thoroughbred | USA | |
| Theralith | chestnut | c | 2000 | Secret'n Classy | Trilby | Thoroughbred | Germany |