Samuel Doyle Riddle (July 1, 1861 – January 8, 1951) was an American businessman and racehorse owner.
His sisters were Lydia Maud Riddle (who married Donald C. Haldeman, general manager for Great Britain and Ireland of the Mutual Life Insurance Company of New York) and Charlotte Buffington Riddle, member number 25516 of the Daughters of the American Revolution (who married Homer Lee of Mansfield, Ohio, founder of the Homer Lee Bank Note Company in New York City).
She was the daughter of John Dobson, who with his brother owned a mill in East Falls, Philadelphia.
[1] In partnership with Walter M. Jeffords, Sr., the husband of niece Sarah, Samuel D. Riddle purchased and operated Faraway Farm on Huffman Mill Pike near Lexington, Kentucky, where they stood Man o' War.
With the $2.5 million and the 72 acres (290,000 m2) of land provided by Riddle, fronted by Baltimore Pike, a charter for the hospital was granted on November 29, 1956.