thumb|A [[Bass recorder|bass (basset) recorder in F made by Johann Christoph Denner, from the Berlin Musical Instrument Museum.]]
Johann Christoph Denner (13 August 1655 – 26 April 1707) was a German woodwind instrument maker of the Baroque era, to whom the invention of the clarinet is attributed.
Denner was born in Leipzig to a family of horn-tuners. With his father, Heinrich Denner, a maker of game whistles and hunting horns, he moved to Nuremberg in 1666. J. C. Denner went into business as an instrument maker in 1678 and was granted rights for the “manufacture of French musical instruments consisting chiefly of oboes and recorders [flandadois]” in 1697. Two of his sons, Jacob and Johann David, also became instrument builders. At least sixty-eight instruments attributed to J. C. Denner have survived to the present day, Denner died in 1707 and was buried in Nuremberg.
On the basis of this passage, Denner has been credited by many with the improvement of the chalumeau and the invention of the clarinet. Despite the words "At the beginning of the current century" he is often said to have developed the clarinet in 1690; there is no evidence for this. Another instrument possibly made by Denner was destroyed in World War II.