Sagamore Farm is an American Thoroughbred horse breeding farm on Belmont Avenue in Reisterstown, Baltimore County, Maryland. Established in 1925, it was owned by Margaret Emerson Vanderbilt who gave it to her son Alfred G. Vanderbilt II 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.