| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| The Gorgon | bay | f | 1897 | Thoroughbred | Great Britain | |||
| The Grand Duke | c | Thoroughbred | ||||||
| 0551-4 The Great Gatsby | bay | c | 2000 | Sadler's Wells | Ionian Sea | Thoroughbred | Ireland | |
| The Heater | grey | f | 1949 | Thoroughbred | USA | |||
| The Heiress | f | 1842 | Thoroughbred | Great Britain | ||||
| 0598-4 The Honorable | chestnut | c | 2001 | Highest Honor | The Blade | Thoroughbred | France | |
| The In-Laws | chestnut | f | 1994 | Be My Guest | Amboselli | Thoroughbred | Ireland | |
| The Inch | bay | f | 1975 | Blair Athol | Thoroughbred | Great Britain | ||
| The Irish Lord | bay | c | 1972 | Bold Ruler | Irish Jay | Thoroughbred | USA | |
| The Irishman | br. | c | 1956 | Nasrullah | Bold Irish | Thoroughbred | USA |