Theodor August Heintzman (birth name Theodore August Heintzmann) (19 May 1817 – 25 July 1899) was a German-Canadian piano manufacturer (Heintzman & Co.) and inventor, best known for founding the piano company which still bears his name. Born in Berlin, Heintzman worked in various manufacturing jobs as a youth, eventually settling in at a German piano factory. In 1840, he married his boss' daughter and, following the lead of her family, immigrated to the United States in 1850. He died in 1899, shortly after the death of his wife.