Sagamore Farm is an American Thoroughbred horse breeding farm on Belmont Avenue in Reisterstown, Maryland. Established in 1925, it was owned by Isaac Edward Emerson of Baltimore, who assembled the property as a gift for his daughter, Margaret. After his death and on his instructions, Margaret Emerson Vanderbilt passed it to her son Alfred G. Vanderbilt, Jr. for his twenty-first birthday. As a member of New York's wealthy Vanderbilt family, Alfred would become the owner and president of Baltimore's Pimlico Race Course. He also became President of Belmont Park. As well, he served at various times as head of the New York Racing Association and the United States Jockey Club.