| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| 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 | ||
| Wauthi | bay | c | 1977 | Authi | Wait and Take | Thoroughbred | Germany | |
| 6945-8 Wave Chrom | bay | f | 2018 | 981020027823566 | California Chrome | Wave the Flag | Thoroughbred | Jack Swain |
| Wave o'Brien | bay | f | 1967 | Irish Lancer | Thoroughbred | USA |