Johann (Georg) Andreas Stein (16 May 1728 in Heidesheim – 29 February 1792 in Augsburg), was an outstanding German maker of keyboard instruments, a central figure in the history of the piano.
He was primarily responsible for the design of the so-called "Viennese" fortepiano, for which the piano music of Haydn, Mozart, and the early Beethoven was written.