Cyrus Hall McCormick, Sr. (1809–1884) fou un inventor estatunidenc i fundador de la McCormick Harvesting Machine Company, que va passar a formar part de la International Harvester Company el 1902. Ell i força membres de la família McCormick foren ciutadans de Chicago prominents.
↑«Cyrus Hall McCormick». Wisconsin Historical Society. [Consulta: 26 agost 2007]. «Cyrus H. McCormick (1809-1884) was an industrialist and inventor of the first commercially successful reaper, a horse-drawn machine to harvest wheat. He was born at the family farm (Walnut Grove) in Rockbridge County, Virginia on February 15, 1809. His father Robert experimented with a design for a mechanical reaper from around the time of Cyrus' birth.»