Arnold Halbach (3 July 1787 in Müngsten, near Remscheid – 16 May 1869 in Baden-Baden) was the Prussian Consul in Philadelphia.He was the son of Johann Arnold Halbach and in 1810, he founded a steel plant in the USA, to supply steel for the local manufacturers of gun barrels. In 1828, the firm "Johann and Caspar Halbach and sons" had to close the plant.From 1828 to 1838, he was the Prussian consul in Philadelphia.