Alfred Stelzner (29 November 1852 – 9 July 1906) was a German composer and luthier. Stelzner was born in Hamburg, Germany, and educated in music, physics and mathematics. He produced string instruments of his own design in Wiesbaden and then in Dresden. Two instruments of his invention were the violotta and the cellone. The violotta is tuned an octave below the violin, and possesses a timbre between that of the viola and cello. The cellone, a large cello, is tuned between the cello and string bass. His instruments received praise and endorsements from major figures of the day, including impresario Alfred Schulz-Curtius, and the German composer Felix Draeseke composed his string quintet in A major, named the Stelzner Quintett, specifically for Stelzner instruments.