The Cincinnati Milling Machine Company was an American machine tool builder headquartered in Cincinnati, Ohio. Incorporated in 1889, the company was formed for the purpose of building and promoting innovative new machine tool designs, especially milling machines. The principals in forming the company were Frederick V. Geier and Fred Holz. From the 1890s through the 1960s, the Cincinnati Milling Machine Company was one of the biggest builders of milling machines.