Cornelius Heinrich Dretzel was a German organist and composer. He was born in Nuremberg, where he appears to have spent his whole life in various organists' posts. He may have studied with J.S. Bach in Weimar (1716–1717), and his compositions reveal points of contact with Bach. They include a concerto for harpsichord solo, perhaps modelled on the Italian Concerto; this solo concerto was once thought to be by Bach; an early version of the slow movement was entered in the first edition of Schmieder's catalog as BWV897:1.