Castletown (3 October 1986 – 17 December 2017) was a New Zealand thoroughbred racehorse who won over $2 million in prize money and is best known for winning one of New Zealand's toughest staying tests, the Wellington Cup, on three occasions.
He had over 100 starts, from two to eight years of age, including a record 13 races over 3,200 metres, a distance at which he excelled.
In his third win in the Wellington Cup, Castletown carried topweight of 58 kilograms, and won a special place in New Zealand racing history, accompanied by the memorable "the dream bursts into reality" commentary from Tony Lee.
Castletown could also be effective over shorter distances, especially earlier in his career, where highlights included wins in the New Zealand Derby, the Kelt Capital Stakes, and the Caulfield Stakes, and he was placed in stakes races as short as 1,600 metres.
He failed to recapture his best form after his last Wellington Cup, and ran his last race in November 1994.