Castle Forbes (foaled 1961) was an American Thoroughbred Champion racemare voted the American Co-Champion Two-Year-Old Filly of 1963. Sired by the Irish stallion Tulyar, winner of the 1952 Epsom Derby, her dam was Longford, a daughter of the very good American runner, Menow. Racing at age three, Castle Forbes won the Acorn Stakes at Belmont Park in New York.