| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Waterloo | bay | c | 1814 | Walton | Penelope | Thoroughbred | Great Britain | |
| Waternymph | chestnut | f | 1860 | Cotswold | The Mermaid | Thoroughbred | ||
| Waterside | br. | f | 1891 | Springfield | Thoroughbred | Great Britain | ||
| Waterside | chestnut | f | 1982 | Topsider | Talk Out | Thoroughbred | USA | |
| Waterway | chestnut | f | 1976 | Riverman | Boulevard | Thoroughbred | France | |
| Waterwitch | bay | f | 1917 | Rill | Thoroughbred | Great Britain | ||
| Wathcote Lass | chestnut | f | 1813 | Thoroughbred | Great Britain | |||
| Watling Street | bay | c | 1939 | Fairway | Ranai | Thoroughbred | Great Britain | |
| Watteau | c | 1954 | Nimbus | Thoroughbred | ||||
| Wattle Bough | br. | f | 1912 | Garganey | Thoroughbred | Ireland |