Blue Peter (1936–1957) was a British bred Thoroughbred racehorse whose career was cut short by the outbreak of World War II.

Bred and owned by Lord Rosebery, his sire was the good racehorse, Fairway and his dam Fancy Free was by Stefan the Great, a son of The Tetrarch.

The onset of World War II ended his chance to win the Triple Crown as the St. Leger Stakes was cancelled.

[1] Blue Peter died in 1957 and is buried in the grounds of Mentmore Towers close to a statue of his ancestor King Tom.

Blue Peter was the horse his owner loved best, shortly after his death Lord Rosebery described him thus: "He was just like a human being although a placid animal.